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Petroleum Development Oman L.L.C.
SP-1101
Specification for Installation of Overhead
Transmission Lines
Document ID
SP-1101
Document Type
Specification
Security
Unrestricted
Discipline
Owner
Issue Date
Version
Electrical
UEE – CFDH-Electrical
August-20
5.0
Keywords: This document is the property of Petroleum Development Oman, LLC. Neither the whole nor
any part of this document may be disclosed to others or reproduced, stored in a retrieval system, or
transmitted in any form by any means (electronic, mechanical, reprographic recording or otherwise)
without prior written consent of the owner.
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ii Document Authorisation
Authorised For Issue
Document Authorisation
Document Owner
Document Custodian
Document Author
(CFDH)
Haddabi, Salim UEE
Kindi, Nabil UEE3
Saifi, Abdul Rahim UEE31
Date : 31-08-2020
Date : 31-08-2020
Date : 31-08-2020
User Note:
The requirements of this document are mandatory. Non-compliance shall only be authorised by
the Document Owner or his Delegate through Variance Tracking Tool approval.
A controlled copy of the current version of this document is on PDO's EDMS. Before making
reference to this document, it is the user's responsibility to ensure that any hard copy, or
electronic copy, is current. For assistance, contact the Document Custodian or the Document
Author.
Users are encouraged to participate in the ongoing improvement of this document by
providing constructive feedback.
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iii Revision History
The following is a brief summary of the 4 most recent revisions to this document. Details of all
revisions prior to these are held on file by the issuing department.
Version
No.
Version
5.0
Version
4.0
Version
3.0
Version
2.0
Version
1.0
Version
0
Date
Author
Scope / Remarks
August
.20
Dec.19
Generally updated.
June
99
Saifi, Abdul
Rahim UEE31
Saifi, Abdul
Rahim UEE31
UIE44, Noora
Naamani
Said Al Shuley,
UIE/6
Ali Al Raisi,
OIE/23
Nov 86
BEB/4
Dec.16
May 08
Format changed and minor
corrections and update made
Format changed and minor
corrections made
Generally updated.
Converted to Specification as per
PDO Policy Cascade & minor
changes to the text.
Original issued as ERD-63-04
iv Related Business Processes
Code
Business Process (EPBM 4.0)
v Related Corporate Management Frame Work (CMF)
Documents
The related CMF Documents can be retrieved from the Corporate Business Control
Documentation Register CMF.
Code
CP-117
Page 4
Corporate Management Frame Work (CMF) Document
Project Engineering Code of Practice
Specification for Installation of Overhead Transmission Lines
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TABLE OF CONTENTS
II
DOCUMENT AUTHORISATION ................................................................................... 3
III
REVISION HISTORY ..................................................................................................... 4
IV
RELATED BUSINESS PROCESSES ........................................................................... 4
V
RELATED CORPORATE MANAGEMENT FRAME WORK (CMF) DOCUMENTS ..... 4
1
INTRODUCTION ............................................................................................................ 6
1.1
PURPOSE ................................................................................................................................... 6
1.2
APPLICABLE STANDARDS, SPECIFICATION AND CODES .................................................... 6
1.2.1
PDO Standards .......................................................................................................... 6
1.2.2
International Standards .............................................................................................. 7
1.3
COMPLIANCE WITH STANDARDS .......................................................................................... 12
1.4
ENGINEERING DOCUMENTS TO BE SUBMITTED ................................................................ 12
2
SCOPE ......................................................................................................................... 14
2.1
GENERAL .................................................................................................................................. 14
2.1.1
2.2
Access to Site ........................................................................................................... 14
SITE PRELIMINARIES AND PREPARATORY WORKS ........................................................... 15
2.2.1
Soil Investigations..................................................................................................... 15
2.2.2
Line Route Survey .................................................................................................... 15
2.2.3
Route Clearance....................................................................................................... 17
2.2.4
Pegging Out.............................................................................................................. 18
2.2.5
Crossings.................................................................................................................. 18
2.3
LINE ERECTION ....................................................................................................................... 19
2.3.1
Safety ....................................................................................................................... 19
2.3.2
Erection of Lines with Lattice Steel Towers .............................................................. 19
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1
INTRODUCTION
1.1
PURPOSE
Revision:5.0
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This Specification is applicable to 132 kV and 33 kV overhead lines constructed using concrete
poles and steel lattice towers.
Specifications SP-1114B,SP-1114C,SP-1114D and SP-1102B specify the design basis for
132 kV and 33 kV overhead lines and include detailed general arrangement drawings for all
types of structures. It shall be the responsibility of the Contractor to ensure that lines are profiled
and the structures are spotted in such a way that the standard design limits are not exceeded.
1.2
APPLICABLE STANDARDS, SPECIFICATION AND CODES
The following Standards, specifications and codes should be consulted when applying the
requirement of this Standard. All listed documents shall be latest issue except those documents
prescribed by date.
1.2.1
1
PDO Standards
HSESM
Health Safety and Environmental Protection Standards
Manual
2
SP-1131
3
PR-1282
Specification for Reinforced concrete
4
PR-1666
Project drawing Procedures.
5
SP-1274
6
SP-1131
7
SP-1011
Specification for Installation of Overhead Transmission Lines.
8
GU-920
Electrical Installation guideline.
9
SP-1102B
Specification for Design of 33 kV Overhead Power Lines.
10
SP-1103
11
GU-946
Specification for Electrical Engineering
Guidelines
Electrical Safety Rules Guidance.
12
SP-1279
Specification for civil construction works.
13
SP-1106
Handover and As built Documentation.
specification for civil & building construction materials Testing
Civil & Building Guide to Concrete
14
SP-1107
Specification for Coding and Identification of Overhead Line
Systems
Electrical Protection Systems.
15
GU-861
Electrical safety Operating Guidance.
16
SP-1109
Specification for Earthing and Bonding.
17
SP-1111
18
SP-1114B
19
SP-1127
Specification for Temporary Electrical Supplies for Construction
& Maintenance Work.
Specification for Design of 132/220kV Overhead Power Lines
on Steel Towers.
Layout of Onshore Facilities
20
SP-1275
Specification and Criteria for Design of Civil & Building Works
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21
GU-756
Survey Engineering Work Execution.
22
SP-2177
Survey Methods and Techniques
23
PR-1817
1.2.2
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Right of way Inspection procedure
International Standards
1.
Design of Overhead Lines
1
IEEE ANSI C2 - 2002
National Electrical Safety Code
2
ASCE No. 74
Guidelines for Electrical Transmission Line Structural
Loading
3
DIN VDE 0210
Planning and Design of OHTL with Rated Voltage
above 1 kV
4
EN 50341
Overhead Electrical Lines Exceeding AC 45kV
5
IEEE:524:1992
Guide to Installation of Overhead Transmission Line
Conductors.
2.
Steel Lattice Towers for Overhead Lines
1
ASCE 10-97
Design of Latticed Steel Transmission Structures
2
ASCE Manual
No. 52
Design of lattice steel towers - Code of practice for Strength assessment of
3
ASTM A 36
Standard Specifications for Structural Steel
4
ASTM A 394
Standard Specification for zinc coated steel transmission tower bolts.
5
ASTM A 572
High Strength Structural Steel, Grade 50
6
ASTM
A588/588M-94
Standard Specification for High-Strength Low-Alloy Structural Steel with 50ksi (345
Minimum
members of lattice towers and masts
Yield Point
7
BS 4:Part 11993
Structural Steel Sections. Specification for Hot-Rolled Sections
8
BS
729:1971(1986)
Specification for Hot Dip Galvanised Coatings on Iron and Steel Articles.
9
BS 3436
Specification for ingot zinc
10
BS 3643:Part
2-1998
ISO Metric Screw Threads BS 4102-1998
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Specification for Installation of Overhead Transmission Lines
Barbed Wire
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11
BS 4190 : 2001
ISO Metric Black Hexagon Bolts, Screws and Nuts-Specification
12
BS 4360
Specification for Weldable Structural Steel
13
BS 4464-1998
Specification for Spring Washers for general Engineering and automobile purposes-Metric
Series
14
BS 4848:Part 4
Specification for Hot – Rolled Structural Steel Section. Equal and unequal angles
15
BS 4872:Part
1:1999
Specification for approval testing of welders When welding procedure approval is
16
BS 5135:1984
Specification for arc welding of carbon and carbon manganese steels
17
BS 5493:197
Code of practice for protective coating of iron and steel structures against corrosion
18
BS 59501:2000
Structural Use of Steelwork in Building
19
BS 7361-6
Coatings on Metal Fasteners - PART 6: Specification for Hot Dipped
Galvanized Coatings
20
BS DD133
Code of Practice for Strength Assessment of Members of Lattice Towers and
Masts
21
BS EN
1990:2002
Eurocode – Basis of structural design
22
BS EN
10025:1993
Specification for hot-rolled products of non-alloy structural steels and
BS EN
10029:1991
Specification for tolerances on dimensions, shape and
24
BS EN 100562-1993
Specification for structural steel equal and unequal leg angle. Tolerances on shape and
dimensions
25
BS EN 101131993
Hot-rolled products in weldable fine grain structural steels
26
BS EN
10155:1993
Structural steels with improved atmospheric corrosion resistance.Technical
delivery conditions
27
BS EN 101631991
Specification for Delivery Requirements for Surface Conditions of HotRolled Steel Plate, Wide Flats and Sections
28
BS-EN-ISO1461-1999
Specification for Hot Dip Galvanising of Structural Steel
29
IEC
60652/2002
Testing of Towers
30
IEC 60826
Loading and strength of overhead transmission lines
31
ISO 1459:197
Metallic coatings – Protection against corrosion by hot-dip galvanizing –
Guiding principles
32
IEEE Std. 9511988
Guide to the Assembly and Erection of Metal Transmission Structures.
23
not required Fusion welding of steel.
their technical delivery conditions
mass for hot-rolled steel plates 3 mm thick or above.
.
3.
Page 8
Foundations
Specification for Installation of Overhead Transmission Lines
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1
BS 8004:1986
Code of practice for foundations
2
BS 8081-1989
Ground anchorage
3
BS 8110-P11997
4
DIN 1045
Concrete, reinforced and prestressed concrete structures
5
DIN 4014
Bored piles, construction procedure, design and bearing behaviour
6
IEC 1277
Full scale test on foundations
7
IEC 61773/1996
Overhead lines - Testing of foundations for structures
8
IEEE Std. 9771991
Guide to installation of Foundations for Transmission Line Structures.
4.
Code of practice for design and construction
Phase Conductors & ACS Sheildwire
1
ASTM A 123-89a
Standard Specifications for Zinc (Hot- Dip Galvanized) Coatings on
Iron and Steel Products.
2
ASTM 399-82
Concentric lay stranded aluminium alloy 6201-T81
3
ASTM 399-90
Standard specification for aluminium alloy 6201-T81 wire for
electrical purposes
4
ASTM B415:1992
Standard Specification for Hard-Drawn Aluminum- Clad Steel Wire
5
ASTM B416:1988
Specification for Concentric-Lay-Stranded Aluminum Clad-Steel
Conductors
6
BS
443:1982(1990)
Specification for testing zinc coatings on steel wire and for quality
requirements
7
BS 1490:1988
Specification for aluminium and aluminium alloy ingots and castings
for general engineering purposes
8
BS 3242-1970
Specification for Aluminium Alloy stranded Conductor for Overhead
Power Transmission
9
BS EN
50182:2001
Conductors for overhead lines - Round wire concentric lay stranded
conductors
10
CIGRE-Electra
No. 75
Permanent Elongation of Conductors - Predictor Equation and
Evaluation Methods
11
DIN 46391
Delivery Drums for Conductors
12
IEC 60104
Aluminium-magnesium-silicon alloy wire for OHTL
13
IEC 60888
IEC 60888
14
IEC 61089:1997
Amdt.1 1997 Round wire concentric lay overhead electrical stranded
conductors
15
IEC 61089:199
Round wire Concentric Lay Overhead Electrical Stranded
Conductors. IEC 61232:1993 Aluminum Clad-Steel Wire for
Electrical Purposes
16
IEEE 738
IEEE Standard for the calculation of Current Temperature
Relationship of Bare Overhead Conductors.
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5.
Optical Fibre Ground Wire ( OPGW)
1
BS EN 1870001994
Generic specification for optical fibre cables
2
BS EN 1880001994
Generic specification for optical fibre cables
3
EIA 492A
Generic Specification for Optical Waveguide Fibers
4
EIA 472A
Sectional Specification for Fiber Optic Communication Cables for
Outside Aerial Use
5
EIA/TIA-455
Standard Test Procedures for Fiber Optic Fibers Cables, Transducers,
Sensors, Connecting and Terminating Devices and other Fiber Optic
Components
6
IEC 60304
Colour coding of fibers
7
IEC 60793
Optical Fibers
8
IEC 60794
Optical Fiber Cables. Generic and production specifications
9
IEEE 1138
Standard Construction of Composite Fiber Optic Overhead Ground Wire
(OPGW) for use on Electric Utility Power Lines
10
IEEE:P1138
Specification for optical fibre ground wire (OPGW)
11
ITU-T G.650
Definition and test methods for the relative parameters of single mode fibres
12
ITU-T G.652
Characteristics of a Single-Mode Optical Fiber Cable
13
ITU-T G.655
Characteristics of Non-Zero Dispersion-Shifted Single-Mode Optical Fibers
6.
1
Insulator Strings & Conductor Fittings
ANSI C29.11
Composite Suspension Insulators for Overhead
Transmission Lines - Tests
2
ASTM 153/153M95
Standard Specification for Zinc (Hot- Dip
3
ASTM A 563
Nuts for Bolted Connections
4
BS 3100:1991
Specification for steel castings for general engineering purposes
5
BS 3288 Part
1:1997
Insulator and conductor fittings for Overhead Power Lines.
Performance and general requirements
6
Galvanized) on Iron and Steel Hardware
Specification for a range of fittings.
BS 3288 Part
2:1990
7
BS 3288 Part
3:1989
8
BS 3288 Part
4:1989
9
BS EN 60383-
Page 10
Dimensions of ball and socket couplings of string insulator units.
Locking devices for ball and socking couplings of string insulator units:
dimensions and tests.
Insulator strings & insulator sets for a.c. systems. Definitions, test method
Specification for Installation of Overhead Transmission Lines
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2:1995
and acceptance criteria
10
CISPR 18-2:1986:
Part 2
Radio interference characteristics of overhead power lines and high- voltage
equipment. Methods of measurement and procedure for determining limits
11
DIN/VDE 0212
Fittings for overhead lines and switchgear, Part 50 to
12
53 DIN 48006
Insulators of overhead lines: long rod insulators
13
DIN 48062-2
Overhead Lines, clevis caps for insulators
14
DIN 48069-1
Double eyes; without protective fitting attachment; for overhead power lines
15
DIN 48069-2
Double eyes; with protective fitting attachment; for overhead power lines
16
DIN 48070-1
Triangular yokes for overhead power lines
17
DIN 48073
Clevis-tongue couplings – Safety devices
18
DIN 48074
Eyes and clevises; connecting dimensions
19
DIN 48075
Parallel groove clamps for aluminium stranded conductors and for aluminium
conductors steel-reinforced for overhead power lines
20
DIN 48078-1
Clevis straps for overhead lines; for coupling to connecting bolts on the strap
side
21
DIN 48215
Clamps and Connectors for Overhead Power Lines DIN 48334
for overhead power lines
22
IEC 60060-1
High voltage test techniques
23
IEC 60120
Dimension of Ball and Socket couplings of String Insulator Units
24
Turnbuckles
Insulators for overhead lines with nominal voltage above 1000 V
IEC 60383
25
IEC 60433:1998
Characteristics of String Insulator Units of the Long Rod type.
26
IEC 60437:1997
Radio interference test on high voltage insulators
27
IEC 60471:1977
Dimensions of clevis and tongue coupling of string insulator units
28
IEC 60507:1991
Artificial pollution tests on high-voltage insulators to be used on a.c. systems
29
C 60587:1984
Test method for evaluating resistance to tracking and erosion of electrical
insulating materials under severe ambient conditions
30
IEC 60707:1999
Method of test for the determination of the flammability of solid electrical
insulating materials when exposed to an igniting source
31
IEC 60815:1986
Guide for selection of Insulators in respect of Polluted Conditions.
32
IEC 61109:1992
Composite Insulators for a.c. Overhead Lines with a nominal voltage greater
than 1000 V – Definitions, test methods and acceptable tests. (& Amendment
1)
33
IEC 61854
Requirements and Tests for Spacers
34
IEC 61284
Overhead lines, Requirements and tests for fittings
35
IEC 61466
Composite string insulator units for overhead lines with a nominal voltage
greater than 1000 V, parts 1 and 2
36
IEEE 4
Standard Techniques for High Voltage Testing
37
IEEE Report PAS-
Standardisation of conductor vibration measurements
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38
IEEE:PAS-85
:l966
Vibration intensity of conductors.
39
ISO 1460:1992
Metallic coatings – Hot dip galvanised coatings on ferrous materials –
Gravimetric
40
ISO 1461:1973
Metallic coatings – Hot dip galvanized coatings on fabricated ferrous products
– Requirements
7.
Earthing
1
BS 7430-1998
Code of Practice for Earthing.
2
BS EN 1654:1998
Copper and copper alloys. Strip for springs and
connectors
3
DIN/VDE 0141
VDE-specification for earthing in installations of
rated voltages above 1 kV a.c
4
DIN 48088
Earth Clamping Bolts
5
IEEE 1048
IEEE Guide for Protective Grounding of Power Lines.
6
IEEE Std. 52411993
Guide to Grounding During the Installation of Overhead Transmission Line
Conductors
1.3
COMPLIANCE WITH STANDARDS
All requirements of this Specification shall apply except where
Manufacturer's standards are more stringent, then the latter shall apply.
equipment
For any deviations from this Specification, the Contractor shall obtain the written agreement
of PDO prior to execution of the related engineering work.
In all cases the Company shall determine the adequacy of design carried out and Works
executed by the Contractor in accordance with this Specification.
1.4
ENGINEERING DOCUMENTS TO BE SUBMITTED
6.
Page 12
1.
2.
3.
OHL Plan and Profile
OHL route plan
SAGTension chart/report
4.
Method statement for soil investigations
5.
Method statement for erection of the Concrete pole structures foundations
Method statement for erection of the concrete poles structures, include with list
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of stringing chart and other construction and measurement tool.
7.
Method statement for erection of the lattice steel towers foundations
8.
Method statement for erection of the lattice steel towers
9.
Method statement for stringing of phase conductors
10.
Method statement for painting of lattice steel towers
Method statement for installation of OPGW and/or Fiber Optic Cables
(ADSS) and splicing in joint boxes
11.
12.
Method statement for galvanization reparations
Method statement for protection of the foundations (including protective
painting, gabions protection etc.)
13.
14.
15.
16.
Method statement for tests on piles/foundations
Design calculation for 132kv OHL tower design
Pile foundation calculation for 132kV tower.
Installation criteria for structures foundations (including tower diagonal
profiles, tower platforms, foundation/chimney extensions etc.)
17.
Page 13
18.
Site test programs
19.
20.
21.
Site test details and site test procedures
Final MTO.
Final OHL accessories material list , include origin of manufacture
22.
Final route records for overhead transmission line
23.
Final result of earthing measurement
24.
Site check lists and test packs as per CCMS.
25.
Project completion report.
Specification for Installation of Overhead Transmission Lines
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2 SCOPE
2.1
GENERAL
This standard defines the requirements for the installation of overhead transmission lines
with concrete pole supports as well as the lattice steel towers as applied to PDO
installations. Concrete poles are to be used for 33kV system and for 132kV Only lattice
steel towers are to be used unless stated by the CFDH-E for specific project.
The following sections define in brief the basic requirements.
2.1.1
Access to Site
The Company shall provide facilities for:
•
Such right of access along the route of the line as the Company agrees is
necessary to enable the Contractor to proceed with erection.
•
The right to construct and make use of a reasonable width of access road
along the route for the transport of materials and installation works, except
at places where the Company considers that construction of access roads
are not practically feasible.
•
The right to transport material from adjacent road on to each continuous
length of the route at agreed points of access. Access road construction
shall be in accordance with SP-1279 Specification for civil construction
works
After obtaining preliminary approval of the Company, the Contractor shall at an early stage
of the Contract prepare access road drawings/maps indicating the access roads both along
the line route and from the existing roads. The Contractor shall obtain route approvals
from all the concerned local authorities (where required) and from the Company. For longer
OHL length requirement for mobile camp should be in place.
Once the Company approves the access roads, the Contractor shall not use any other
access without the specific approval of the Company.
The access roads shall be suitable for patrol and maintenance to all parts of the
finished line except in the areas where the Company considers provision of access roads
are not practical.
The Contractor shall regularly liase with the Company Public Relations Department at all
times throughout the construction to ensure minimal disruption of the local population.
Page 14
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2.2
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SITE PRELIMINARIES AND PREPARATORY WORKS
2.2.1
Soil Investigations
The Contractor shall be responsible for conducting his own soil investigations, to the
satisfaction of the Company, to determine the nature of ground conditions for the design of
foundations (refer to SP-1274).
The Contractor shall also carry out & obtain soil resistivity data during the soil
investigations to determine the type and extent of earthing required at to determine the
support-footing resistance and the requirement of counterpoise earthing.
2.2.2
Line Route Survey
2.2.2.1 Centre Line Survey
Centre line survey is a preliminary survey, which fixes the proposed line route, angle and
terminal points. Normally the Company carries out preliminary survey and issues
preliminary line route drawings with the tender. The Contractor shall check the line route
with reference to preliminary route drawings and shall follow the route shown in the
drawings. If a change in route is required for any practical reason, approval should be
obtained from the Company. Need to address the route survey for OHL extension and well
hook up. Suggest reference to typical route survey shall be referred to it.
2.2.2.2 Detail Survey, line profiles and structure spotting
The Contractor shall carryout a detailed precision survey for plotting ground
and line profiles. While carrying out this work the following points shall be
adhered to:
Page 15
•
The survey shall be carried out using instruments with accuracy within the
permissible limits. Theodolite may be used for carrying out the survey
although Total Station is preferred. The distance shall be accurately measured
either by using tape/chain or tacheometry or by triangulation method
depending on the territory. Electronic distance measurement (EDM) is
preferred.
•
The ground profile shall be plotted on a 1: 2000 m scale (horizontal) and the
line profile on a 1: 200 m scale (vertical). All angle and terminal points shall
be fixed and their UTM co- ordinates shown on the drawings.
•
Bench marks shall be fixed along the line route based on the datum
approved by the Company. Levels shall be taken at every 20 m along the
line route and at each structure location, obstructions, cuttings and shallow
portions. In addition, levels shall be taken for any sudden change in slopes
more than 30 cm in height.
•
Where the line passes through slopes across the line, levels shall be taken
on the transverse sides at an off-set distance of 20 m, in addition to the
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•
•
Page 16
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centre line, to confirm that the ground clearance for the end conductors are
within the specified limits. The offset levels shall be indicated on the profile
and parallel lines drawn on either side of the centre line indicating the
beginning and end of such terrain.
Ground levels shall also be taken at the point of road, track, wadi, pipe line
and overhead line crossing the proposed line.
•
All details upto 50 m on either side of the line shall be indicated on the
ground profile drawing. These include any existing or planned infrastructure
trees, obstructions, structures, sand dunes, mounds and ditches.
•
The location and width of roads, tracks, wadis, overhead lines,
underground pipes/cables crossing the proposed overhead lines together
with the angle of crossing shall be clearly indicated in the profile drawings.
•
It is necessary to note the following details in the profile drawings for any
overhead line crossing the proposed line:
- The height of the top most and bottom-most overhead line conductor
crossing the proposed line route, at the point of crossing and at the
point of supports. This information is required to determine the type
(either above the existing line or below that or by underground cable) of
proposed line crossing. The temperature at the time of measurement of
conductor heights at the point of crossing shall be noted.
- The voltage rating and type of
construction.
- Distance from the crossing point to the support structures on the existing
line to be crossed.
- Existing line structure identification numbers on either side of
proposed line crossing.
•
The profile drawings shall indicate the visual nature of the ground, the line is
traversing, such as clay, sand, rock, marsh, water logged, soft ground,
cultivated land, wadi bed, normal ground etc. and their boundaries, along
the line route, shall be clearly indicated.
•
The survey data shall be plotted on to a drawing sheet with the Company
standard details and title blocks, to give ground and line profiles. The
drawing material shall be A1 size polyester reproducible with printed grid
lines of increasing thickness in 1, 5, 10 and 50 mm squares and drawn on
the reverse side of the material. Individual profile sheets shall not exceed
the size of A1 drawing sheet length-wise.
•
Profiles generated by approved overhead line software packages are preferred.
•
The line profile (vertical) shall be plotted in accordance with the design
parameters obtained from the Company SPs for the design of 33 and 132
kV overhead lines respectively. While drawing the profile, a sinkage of 300
mm shall be considered for the structures.
The line profile drawings shall contain proposed location and type of each
support, values of wind, weight and equivalent spans, and section lengths.
late based on the design data shall be prepared and used to draw profile
curves for the bottom most conductor. Two curves shall be drawn, one
curve based on the specified maximum temperature of the conductor (hot
curve) and other curve based on the minimum ground clearance
(clearance curve) and location of each structure spotted on the drawings.
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•
•
Perspex templates shall be prepared by the Contractor to check the hot curve
and the ground clearance curves.
After the approval of the profile drawings, the Contractor shall spot the
structures in the field and shall peg the location of each structure as indicated below.
2.2.2.3 Clearances
The Contractor shall ensure that clearances are maintained from the live line to any part of
the line or surroundings as per the following SP’s.
• SP-1102B
-
• SP-1114B
-
• SP-1114C
-
• SP-1127
• PR-1817
-
Specification for Design of 33kV Overhead
Power Lines
Specification of Design of 132 & 220kV Overhead Power
Lines on Steel Towers
Specification for Design of Twin ELM 132 kV Overhead
Lines on Concrete Poles
Layout OF onshore facilities and Facilities.
Right of way Inspection procedure
All graded roads, including well access roads, shall be taken as public roads within the
terms of SP-1127
.
The Contractor shall ensure that clearance to the existing and future pipeline and wells
shall be allowed for as per the requirement of the Company. Pipeline clearance distance
shall be measured from the edge of the pipeline. . (Reference to other SP SP-1208 )
2.2.2.4 Structure Schedule
The Contractor shall prepare a Structure Schedule consisting of structure location, type,
height, span, section length, horizontal deflection (angle of deviation), type of foundation
and number of stay wires. The schedule shall also contain special remarks such as
whether ground has to be filled or levelled or platform or any foundation protection
required. This schedule shall be submitted together with the profile drawings for the review
of the Company.
2.2.3
Route Clearance
2.2.3.1 Vegetation
The following requirements shall be considered while clearing the
ground:
Page 17
•
Trees and tall shrub shall be cleared to a distance of 15 m on either side of
the centre-line of the route. Trees and bushes shall be cut down to a
height of not more than 1.25 m above ground level, after prior approval of
the Company.
•
Whenever possible, felling of trees shall be avoided and should be
executed only with the express permission of the Company.
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•
2.2.4
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Felled trees and shrub together with the roots shall be removed from
underneath the proposed overhead line and also on the access road
running along the line route and access roads from existing roads to the
line route. The access road shall be graded road suitable for traversing by
a 4-wheel drive vehicle for line patrol and maintenance by the Company.
Pegging Out
The location of each structure shall be pegged out onsite.
For angle and terminal locations, the peg shall consist of a steel angle stake
painted with bands of red and white to avoid corrosion and for easy
identification. Each peg shall be stencilled with the UTM co-ordinates, angle of
deviation and structure number.
For intermediate structure locations, either wooden or steel stakes can be used.
These stakes shall be painted with bands of red and white paint and structure
number shall be stencilled on the stake.
All stakes shall be provided with a triangular red and white flag as a mark of
caution. The pegs shall have a pointed edge on one side, which should be
driven into the ground for at least 0.5 m to keep them firm and steady.
Pegs shall be installed to mark the centre of the structure. Pegs shall also be
installed in transverse direction for angle structure locations if required by the
Company.
After pegging all structure locations, before commencing construction, the
Contractor shall give seven days notice to the Company for inspection of all
structure locations/peg points. If required by the Company any or all locations
shall be resurveyed and repegged.
If structures are located in poor ground or if there are any obstructions the
Contractor may relocate the structure subject to the satisfaction and agreement
of the Company.
2.2.5
Crossings
2.2.5.1 Road and Service Crossings
When the Contractor is ready to commence stringing of conductors along or
across power lines, roads, or the like, he shall give a minimum 7 days notice to
the Company for approval of the date and time at which he proposes to execute
the Work.
The Contractor shall provide diversions to the existing roads where it is
necessary to avoid interference with the traffic as required by the Company or local
authorities. Where the Company or any authority requires it, the Contractor shall
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schedule the erection and stringing work at any timings of day or night as per the
convenience of the Company or authorities. The Contractor shall ensure that
sufficient resources are provided to complete the work during the allocated
period.
During any such works the Contractor shall provide appropriate warning notices,
flashing lights, flag-men etc. as required by the Company or the local authorities,
to ensure the safety of the public.
2.2.5.2 Other Crossings
The Contractor shall at his own expense make the necessary arrangements and
take any necessary precautions where the line route traverses ground over
which erection cannot be executed in the normal manner.
2.3
LINE ERECTION
Before commencement of the Works, the Contractor shall submit a written
Work Method Statement covering all aspects of the overhead line erection
work as indicated in this document. The Company shall have the right to
require alterations to the proposed working method to ensure safe practice and
high quality of the finished line.
2.3.1
Safety
The Contractor shall obey the entire content of GU 861 ‘Electrical
Safety Rules Guideline'.
Once conductor stringing has been completed, temporary earths shall be
applied to the line at the place of work (Worksite) before performing any further
high level Works.
Lifting procedure must be prepared and approved as per the company
procedures such as lifting procedures for concrete poles illustrated in SP1102B, SP-1114C & SP-1114D.
2.3.2
Erection of Lines with Lattice Steel Towers
2.3.2.1 Foundation for Lattice Steel Towers
General
The foundation installation shall include site preparation, excavation, foundation placement
measurements, stub angles, backfilling, foundation cap protection and clean up of the site.
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The Contractor shall select the suitable type of foundation to be submitted for approval
based on soil investigation data as well as information concerning flooding or other
considerations affecting the foundation erection and maintenance. The foundation type for
each tower location shall be selected by the Contractor to suit the particular site condition
and the list for selected types shall be submitted for approval. Where the line route is on
subkha, aggressive soils, sand dune areas or wadis the piled foundations with or without
permanent casings, shall be considered.
The foundation types to be installed shall cover all range of ground conditions occurring along
the line route; among these may be included: normal ground, soft rock, hard rock, wadis
conditions, sand dunes, subkha. Where actual soil conditions encountered show that the
foundation required cannot be of standard range, then a special foundation shall be installed.
The type of foundation to be used at each tower position shall be the most suitable practical
solution.
Wadis are watercourse beds, which can be dry for most of the year but are subject to
occasional flash flooding. The structures in a wadi shall resist to water flow and shall be
protected against pressure of water and debris.
In sand dune areas the movement of the dunes can affect the overhead line structural
integrity and electrical clearances.
Subkha shall be considered the coastal flats of salty sands, but can be also of gravely, silty
clay strata, of weak strength or some compact cemented layers. The water table frequently
reach the ground level and above.
2.3.3.1.1 Site Preparation
The Contractor shall make all measurements on site in order to establish the
excavations limits or drilling positions, stub angle, template location data. All
measurements shall be within the specified tolerances for steel lattice tower
foundations.
The centre peg shall not depart from the line axis by more than 50mm (except
where approved offset is required). The centre peg of a foundation of
intermediate support shall not depart from the longitudinal position by more than
500mm.
The Contractor shall clear site area after installation, removing all
debris or rubbish.
2.3.3.1.2 Concrete
The concrete work shall comply SP 1282 “ Specification for Reinforced Concrete”
For approval of concrete mix, the Contractor shall submit the following details: cement type,
cement content, grading of aggregates, water/cement ratio. For each concrete mix, the
Contractor shall provide a representative trial mix and make cubes to be tested for compressive
strength at 7 and 28 days. Testing shall be in accordance to requirements of BS 1881. The
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proposed concrete mix shall provide necessary characteristic strength, durability, density,
resistance to sulphate and chloride attack.
2.3.3.1.1 Cement
Unless specified otherwise in the Contract documents, Cement used for Concrete
Works should be Ordinary Portland Cement in accordance with BS EN 197 or ASTM
C150.
If soil conditions, ground water, seawater or effluent water, are harmful to Ordinary
Portland Cement, the most appropriate of the following types of cement shall be used
after getting approval from the Company.
- Sulphate Resisting Portland Cement Type-V in accordance with ASTM C150
- Portland Blast-Furnace Cement in accordance with BS EN 197 or Portland
Cement Type-II in accordance with ASTM C150
- Ordinary Portland cement with micro silica conforming to ASTM C1240 or BS EN
13263-1. The quantity of micro silica to be used shall be determined based on
trial mix design.
2.3.3.1.2 Reinforcing Steel
The Contractor shall have the approval of PDO for the reinforcing steel to be used.
Steel reinforcement in Concrete Works shall be ribbed round hot-rolled high-yield highbond
bars complying with BS 4449. Cold-worked bars shall not be used. The Contractor shall
provide samples and mill certificates showing the grade and quality and shall test the
samples. All reinforcement shall be clean and free from dust, mill scale, loose rust, paint,
oil etc.
Dimensions of hooks, bends, etc, not specifically dimensioned on the bending schedule
or elsewhere shall comply with BS 8666 and BS EN ISO 3766. Bars incorrectly bent
shall not be straightened and re-bent. Heat shall not be used for bending
reinforcement
Reinforcement shall be stored on site in protected racks above ground to avoid any damage
2.3.3.1.3 Excavation and Backfilling
The Contractor shall make excavations as specified on foundation drawings.All
excavation and backfilling shall be in accordance with SP -1279 “Specification for
Civil Construction Works”.
2.3.3.1.4 Installation of Foundations
Stubs for tower foundations shall be installed by the use of approved
templates. The foundation setting tolerances are:
(a) The difference in elevation of foundation stubs: 5mm on tower face and 10mm
between diagonally opposite legs.
(b) The face dimensions (at the top of stub): 5mm from the approved tower
drawings. The diagonal distance between any two stubs (at top of stubs): 10mm from
dimensions specified on approved tower drawings.
(c)
The slope of stubs: shall not differ by more than 5mm/metre of the
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stub length.
The production, transporting, placing, compacting, concreting in hot weather and curing of
concrete, the procedures for formwork requirements, construction joints and inspection shall
be in accordance with specifications of BS 8110:1997.
The towers will be erected when the backfilling is complete and the concrete has achieved
its required designed strength
2.3.3.1.3 Bored Piles Installation
The reinforcement shall be maintained in correct position during concreting. The cages
shall be sufficiently rigid as to be handled without deformations. The bored piles installation
shall comply to BS EN 1536:2000.
On completion of boring, loose or disturbed soil shall be removed from the base of the pile.
Lining tubes shall be provided for sufficient depth to ensure the stability of the pile excavation
during boring and concreting operations.
The temporary casings shall be withdrawn, during or immediately after completion of
the concreting and before concrete is starting to harden.
The use of conventional vibrators, for bored piles, is not permitted.
2.3.3.1.4 Protection of Foundations
The Contractor shall provide anticorrosion paint treatment on tower stubs, steel piling
casing and pile caps. The painting of the stubs with two layers of an epoxy type paint
shall be applied on 300mm above concrete level.
After concreting the foundation caps, the joint with the stub angle shall be sealed with an
acrylic type seal material on 10cm thickness around the stub angle. The foundation cap
shall be painted with a coal tar paint on 150mm over the concrete level and 300mm under
ground level.
Where instructed by PDO, the Contractor shall install gabion walls to protect tower
locations against flooding waters. Gabions shall be filled in double-twisted hexagonal mesh
of PVC coated galvanised steel wire of at least 2.5mm (steel) diameter. They shall be
rectangular boxes of 2m long, 1m wide and 1m high with two compartments separated
by a diaphragm, filled with approved broken rock of a minimum size greater than the mesh
eye.
Where required by PDO, the location shall be protected against erosion or floods by
gatch platforms compacted to 150mm thick and extending 5m from the tower foundations.
In low-lying areas and on subkha areas of the line, gatch platforms of 500mm thick
minimum shall be considered upon instructions from PDO.
2.3.3.2
2.3.3.2.1
Erection of Lattice Steel Towers
General
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The Contractor shall ascertain that all concrete foundations or rock anchor grouting are
cured and that all back-filled material is compacted to its approved level before placing or
erecting tower steel on the foundations. Concrete in tower foundations shall be allowed to
set a minimum of 7 days before erection of the tower and a minimum of 28 days before
conductor and earth wire installation on the tower.
The Contractor shall erect the types of towers specified at the locations indicated on the
Contract Drawings.
Towers shall be assembled in accordance with the approved drawings and erected by a
suitable method, which will not overstrain structural members or their foundations,
subject to PDO’s approval.
2.3.3.2.2
Handling and Storage of Steel Towers
Steel shall be stored on wooden supports of sufficient height to avoid any ground contact or
other contamination. Storage conditions shall be well ventilated, preventing the formation of
wet storage stain from accumulation of humidity and sand. It shall be clearly
understood, that white rust formation will lead to rejection of the affected material.
All necessary measures shall be taken to prevent structural injury to members, or
damage to galvanized coatings. Members shall not be dragged on the ground, nor will
the practice of throwing tower steel into piles on conveyances, or from conveyances
onto the ground, and of skidding steel members over each other, be permitted. Lifting of
tower steel shall not be done with steel slings, being in direct contact with galvanized
surfaces. Instead, fabric belts, or other suitable protection shall be applied.
Tower material damaged shall be replaced by the Contractor at no cost to
PDO.
Small accidental damages to galvanized surfaces may be repaired by application of an
approved repair paint.
Minor damages to galvanized steel members could be repaired by application of a special
paint as follows:
•
Brush cleaning of the damaged area of any trace of dust, rust and degreasing
(if necessary);
•
Coating of the damaged area with two layers of zinc rich paint containing at
least 95% Zn in the dry film. The painting shall be done according to manufacturer’s
instructions. The final dry fill of paint shall be at least 150 microns.
Larger damages to, or systematic defects of the galvanizing shall be repaired by hot-dip
galvanizing, only.
The attempt to repair shall not bind PDO to accept the repaired part when this is reoffered for inspection.
Acceptance by PDO of any repaired galvanized steel does not absolve the Contractor from
his responsibility of supplying galvanized steel to give satisfactory service in the prevailing
corrosive atmosphere. PDO reserve the right to reject any galvanized steel found rusty,
damaged, bent or other-wise defective, before final acceptance.
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2.3.3.2.3
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Erection of Steel Towers
Prior to the commencement of any tower erection activity the Contractor shall submit for
approval a Method Statement detailing the proposed erection methods and safety
precautions to be taken during the erection.
The Contractor shall erect towers for the transmission line in accordance with the
erection diagrams, construction lists and other drawings and instructions.
The method of assembling and erecting a tower shall be such that during erection no
member shall be subjected to any stress in excess of that for which it was designed.
Misalignment or misfit of adjacent sections or members attributable to the adopted
method of erection shall be corrected by changing erection methods as necessary to
eliminate trouble.
Straining of members shall not be permitted for bringing them into position. It may,
however, be necessary to match hole positions at joints and to facilitate this, tommy bars
not more than 450mm long may be used.
For ease of checking bolts and nuts shall be generally fitted in such a way that the nuts
are placed outside for horizontal bolts and downside for vertical bolts.
Before starting erection of an upper section, the lower section shall be completely
braced and all bolts provided tightened adequately in accordance with approved
drawings to prevent any mishap during erection.
All plan diagonals relevant to a section of tower shall be placed in position before
assembly of upper section is taken up.
All members shall have their joints cleaned when bolted
up.
If erected by assembling in sections, the initial tightening of bolts shall be adequate for
dead load, live load and direction stresses, but shall not be so strong as to prevent
aligning and fitting adjacent sections or members. The assembled sections shall be
adequately supported during erection.
All blank holes, if any left, after complete erection of the tower, are to be filled up by
bolts and nuts of the correct size.
During the erection, no tools shall be taken up to the towers, except structure wrenches
and drift pins. Only such wrenches will be allowed, which do neither deform nor injure
the galvanized coating of the bolts/nuts. Use of drift pins is limited to guiding the
different tower members into position, without enlarging holes or distorting tower
members.
Each bolt shall be securely tightened with adequate but non-excessive torque. Proper
tightness shall be spot checked by the Contractor, to PDO’s satisfaction, with an
accurately calibrated torque wrench. The tightening torque to be applied on bolts is the
following:
–
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–
–
–
–
–
–
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7,0 daN×m for 14mm dia bolts
9,7 daN×m for 16mm dia bolts
17.2 daN×m for 20mm dia bolts
20.3 daN×m for 22mm dia bolts.
22.0 daN×m for 24mm dia bolts.
25.0 daN×m for 30mm dia bolts.
All tower bolts shall be completely tightened, immediately after a tower is erected. After
erection, towers shall be left in workmanlike condition, complete and safe in every respect.
In order to prevent pilfering, all bolts and nuts below a minimum height of 3 m above
the foundation cap shall be secured by suitable means, to be proposed by the Contractor,
for PDO’s approval.
During assembly punching, reaming or drilling for correction of mismatched holes shall
not be permitted without the authorisation of PDO in writing.
If any shop errors are discovered in the steel, the Contractor shall notify PDO who will
decide on site whether the error shall be corrected on site or the members shall be replaced.
All exposed steel surfaces around the holes or on cuts on which corrective work is
permitted shall be given sufficient coats of an authorised zinc rich paint to provide
sufficient protection to the steel and shall be to the approval of PDO.
Towers must be completely erected with all members in place and bolts securely tightened
before any stringing of conductors or earth wires may be started. All towers shall be
inspected by PDO accompanied by the Contractor before the stringing operation. Prior to
the erection of towers or parts of towers, which had completely been assembled on
ground, the approval of PDO is required.
In aviation-marking areas, immediately after erection above foundation level, the towers
shall be illuminated, either by the permanent lighting system or by a temporary lighting
system, to be approved by PACA (Public of Civil Aviation)
2.3.3.2.4
Tolerances for Installation of Steel Towers
Members deformed in excess of the allowed limits shall not be erected
Compression elements shall not have lateral deformation exceeding 1/600 of the member
length. Tension members shall not have lateral deformation exceeding 1/300 of the
member length.
All towers shall be vertical after erection and shall remain substantially vertical under the
stresses set up by the overhead line when complete. The self supporting tower shall not
be out of plumb from transverse or longitudinal centreline by more than 1/480 of its height.
2.3.3.3 Aircraft Warning Painting
2.3.3.3.1
General
All towers shall be red and white bands painted in accordance to Annex 14, Aerodromes,
Chapter 6, paragraph 6.2.5 of the International Standards and Recommended
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Practices issued by the International Civil Aviation Organization, and is subject to the
PDO's approval .The towers fouling within a radius of 4.6km from runway shall be painted.
This specification is to define surface preparation, protective coatings and paint systems
to be applied on equipment and structures unless otherwise specified.
The general guides for the work shall be:
a) This specification
British Standard Code of Practice CP.2008; 1966, B.S.: 4232, 2015, 729,
3083, 381 C,
4479, 4360, 3294 and 4604
(a)
2.3.3.3.2
(b)
Swedish Standard SIS 05 59 00 - 1967 or equivalent standard
(c)
German Standards DIN 55 928 and DIN 4115 or equivalent standards
(d)
the paint manufacturer’s Technical Data Sheet and Instructions.
Surface Preparation
Prior to chemical treatment / surface preparation, the galvanised surfaces
shall be carefully cleaned by brushing with fresh water to remove all foreign
substances such as salt, white rust and zinc corrosion products, dust sand and
dirt. If the galvanised steel surfaces shall be chemically treated it has to be
subject to the approval of the PDO.
Prior to painting, the galvanised surfaces shall be carefully checked for
damages, defects and impurities. In case of persistent white rust and corrosion
products it is necessary to remove these by sweep-blasting or mechanical
brushes. However, tarnishing of surfaces must be avoided. In specific cases
where damages are severe, re-galvanising shall be required.
Such prepared surfaces must be approved by the PDO prior to
paint application.
2.3.3.3.3
Preparation of coating materials
Primers and paints which have liveried, gelled or are otherwise deteriorated
shall not be used. All ingredients in any container shall be thoroughly mixed
before use and shall be agitated frequently during application to keep the primer
in suspension.
Primer or paint mixed in the original container shall not be transferred until all
settled pigment is incorporated into the body of liquid. Primer or paint shall be
mixed in a manner ensuring the breakdown of all lumps, complete dispersion of
pigment and uniform composition.
Thinners shall not be added to primers or paints unless necessary for proper
application according to the manufacturer’s instructions.
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The type of thinners used shall comply with the manufacturer’s
‘instructions. When use of thinners is permitted, it shall be added to the
primer or paint during mixing in a good ventilated area.
2.3.3.3.4
Painting of Steel Towers
For better adhesion and corrosion protection priming coats shall be applied by
brush or by airless spray only. The other coats of paint are to be applied by
brush roller or spray and in accordance with the paint manufacturer’s
recommendations.
-
first layer of primer
-
second layer of intermediate coat
-
the final layer of red or white colour.
Type of paint to be applied on lattice steel towers and minimum thickness
shall be:
-
Zinc-rich primer (two pack epoxy zinc rich primer, e.g. polyamide cured)
with a grey dry film minimum thickness of 40 microns.
-
Intermediate coat (two- p a c k epoxy micaceous iron oxide, e.g.
polyamide cured) with a dark grey film thickness of minimum 60 microns.
-
Final coat of aliphatic polyurethane or acrylic epoxy with a white (RAL
9010) and red (RAL 2002) dry film thickness of minimum 60 microns.
-
All surfaces to be painted must be moisture-free and paintings shall not take place when:
the surface temperature is above 50°C
-
the relative humidity is above 85% or the surface temperature is closer than
3°C or below the dew point
-
-
It is raining
-
sandstorms occur to such extent that the wet painting might be affected.
To ensure the suitability of paints the Contractor shall execute sample tests at site. Such
panels must be approved and shall be used as reference for quality control.
These tests shall be carried out at a very early stage of the contract period and no paint
shall be ordered beforehand. Final selection of the paint is subject to the approval of PDO,
depending on the results of the above mentioned site tests.
All finishes shall be clean and in good sound conditions. Each coat shall completely and
uniformly cover the coat underneath it.
There must be no delay between application of successive coats but each coat must by
thoroughly dry or as directed in the paint instructions before next coat is applied. Before
additional coats are applied to painted surfaces, the existing paint shall be cleaned of all
foreign matters and suitably sanded if necessary.
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Excessive coat thickness shall not exceed the maximum specified by the paint
manufacturer.
2.3.3.3.5
Responsibilities and Guarantees
Inspection of coatings by PDO shall neither relieve the paint manufacturer from his
responsibility of providing good quality products nor the Contractor from his responsibility
of acquiring the specified quality of material or the correct performance of the work. This
is also applicable to shop-primed structural steel or other components.
The Contractor shall bear the full responsibility for galvanizing and paint applied by him
or by others.
The complete painting system is guaranteed for a period of not less than 5 years after
the Final Acceptance Certificate.
The Contractor shall provide a Guarantee Performance Bond to assure the performance of
extended guarantee obligations for PDO painting system. The Contractor shall carry out
during the extended guarantee period any repair or replacement on the painting system
executed under this specification at no additional cost after being intimated by PDO.
If the repairs are not carried out to the satisfaction of PDO, these repairs shall be
performed by others, who will be assigned by PDO, and the costs thereof shall be
borne by activating the Performance Bond valid for the extended guarantee obligations.
2.3.4
Conductor Stringing
2.3.4.1 Preparation
Before commencement of stringing, tower footing resistance tests shall be made at each
tower and necessary earthing devices shall be installed and tested.
Conductor and earthwire erection shall be carried out entirely by approved tension
stringing methods, keeping conductor off the ground al all times when the conductor is in
motion.
Tenderers shall include with their Tenders details of the precise method of tension
stringing they propose to use, together with details of their proposed stringing equipment.
and qualified operators and linesmen .
At least 3 months before stringing commences the Contractor shall submit to the
Engineer for approval a fully detailed, comprehensive work proposal which shall include, but
not limited to, the following:
-
Work sequence and methodology including creep compensation regime;
-
Locations of conductor drums and winch location;.
-
Temporary stay arrangements and temporary support strengthening;
-
Scaffold positions and types;
-
Positions of mid-span (tension) joints;
Page 28
Specification for Installation of Overhead Transmission Lines
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-
Procedures and method for making joints and dead end clamps;
-
Schedule of conductor accessories to be fitted;
-
Erection (initial) sags and tensions.
Particular attention shall be given in this work proposal to the procedure for
stringing the OPGW where special care is required to guard against damage to
the optical fibre cable.
The supplier of the OPGW will be responsible for the supervision of installation
by the Contractor, to ensure that the overall system reliability requirements
met. To ensure that this is undertaken, the supplier will provide the services of
a suitable qualified/experienced installation supervisor, who shall supervise the
installation of the works throughout and shall advise PDO and the Contractor in
matters of methods procedures and precautions to be followed and will be
responsible for all matters pertaining to the quality of the installation.
The Contractor shall provide PDO with a method statement giving
sequential details of the stripping procedure and the optical fibre jointing
(splicing) procedures. The method statements shall take full cognizance of the
manufacturer's installation instructions.
The method statements shall be submitted to PDO for acceptance the
requisite period prior to stringing or optical fibre jointing commences.
The Contractor shall ensure that the fibre optic cables are not strained or
damaged either mechanically or optically during stringing and/or jointing. The
Contractor shall demonstrate the suitability of his proposed method, including
the choice of running blocks and stringing equipment, bull wheel diameters,
fibre optic cable wrapping equipment and methods etc., prior to the
commencement of stringing operations.
Optical fibre joints either in the OPGW or between the OPGW and the nonmetallic underground fibre optic cable shall be housed in optical joint boxes.
The joint boxes shall be located immediately above the anti-climbing device for
convenient access by technical personnel. All joint boxes shall be earthed to
the support steelwork using approved multi-wire/multi-strand flexible aluminium
earthing bonds or copper earth fitted with bi-metallic lugs.
2.3.4.2 Equipment and Tools
Conductors, joints, and clamps shall be erected using approved tools and in
such a manner that no birdcaging and over-tensioning of individual wires or
layers or other deformation or damage to the conductors occurs. Clamps or
hauling devices used in erection shall be of approved design and shall not
allow any relative movement of strands or layers of the conductors.
The Contractor shall supply all the necessary drum-stands, drum-spindles,
drum-brakes and jacks to ensure efficient paying-out of conductors.
All winches, anchor sheaves and running lines shall be supplied by the Contractor and
maintained in good order to the approval of the Company.
Page 29
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Connection of the steel running line (pilot wire) to the conductor shall be to the approval of
the Company and shall be of a type capable of passing through the slinging snatch.
Snatch blocks for slinging conductors shall be of an approved type and shall be
robust. The conductor pulley shall be fabricated from aluminium or similar material.
The Contractor shall provide sufficient snatch blocks to satisfactorily achieve the stringing of
the longest continuous line section.
Tensioning bull wheels shall have a minimum diameter of 35 times the outside diameter of
the largest conductor required under the Contract or as necessary to suit the
requirements of the OPGW, and will have multiple grooves lined with neoprene such that
conductors smaller than the
groove or as required diameter will seat into the lining without being flattened. Brakes
and controls shall be hydraulically operated to minimise danger of brake failure. The
tensioner design shall be such that once the required tension is obtained, the conductor
will remain at that tension so long as the brake setting remains unchanged.
Conductor running out blocks shall be so designed as to allow conductors to be
pulled out smoothly and shall have a minimum diameter of 600mm at the bottom of the
conductor groove. Blocks will be of low friction design and the block groove shall be lined
with neoprene. Blocks are to be designed so that the pilot wire does not damage the
neoprene lining during conductor running. Running out blocks which do not run freely or
operate properly shall be removed from site for repair and must receive the Engineer's
approval before they may be re-used. The blocks shall have an electrical conducting
path between their suspension fittings and the conductors supported by the blocks. The
above shall be applied for all span length
2.3.4.3 Drum Lengths and Joints
The Contractor must note that the Company's policy is not to permit the use of midspan
joints.
The Contractor shall make use of maximum conductor lengths in order to avoid midspan
joints and to reduce the wastage to a minimum. A Drum Schedule shall be prepared by
the Contractor and approved by the Company prior to stringing.
If mid-span joints are finally approved, the number and location of such joints should be
submitted to the Company for approval. These joints shall be not less than 25 m from the
nearest conductor clamp, and joints between different phase wires in the same span
should be adequately staggered to the satisfaction of the Company.
Mid-Span joints shall not be used:
•
With less than 2 complete spans between joints.
•
In single spans or within 2 spans of a section pole.
•
In spans crossing power lines, roads, etc.
Conductor repair sleeves shall not be used without the permission of the
Company.
Page 30
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Only compression connections shall be used and comprise exclusively the type specified
in the material lists, unless otherwise directed by the Company. Bimetallic compression
connections, as specified in the Company Standard Drawings and Schedule of Overhead
Line Materials, shall be employed where equipment with copper terminals are to be
connected to line conductors.
The Contractor shall test each joint, etc., in accordance with Section 2.6. Test results,
together with the location of each fitting, date of assembly and name of the linesman
responsible for the assembly, shall be recorded on functional test sheet (see Section 2.6).
This record shall be handed over to the Company on completion of each section of line.
The Contractor shall obtain approval from the Company for the Linesmen employed to
make compression joints. The Contractor shall obtain this approval through the
submission of a test joint for quality control check by the Company.
Where records of joints made by any particular linesman show a repeated performance
below the required standard, the Contractor, at the request of the Company, shall
cease to employ the linesman on Company’s installation jointing operations and shall
immediately replace him with other approved personnel.
2.3.4.4 Conductor Damage
Since the ground that the transmission line traverses is in many parts boulder-strewn or
rocky, the Contractor shall employ an approved method of pilot wire tension stringing to
keep the moving conductor off the ground during stringing operations. Alternatively, the
Contractor shall provide trestles or scaffolds to ensure that the conductor does not touch
the ground whilst in motion. The Contractor shall forward to the Company for approval full
details of the tension-stringing method, together with details of machine and equipment he
proposes to use.
When due to a mishap a conductor makes contact with the ground, stringing work shall stop
whilst the conductor is examined and offered for inspection to the Company. The
Company at its discretion may order such quantity of phase conductor or earth conductor
to be discarded and replaced by the Contractor at his expense.
In the case of local damage to individual wires of a conductor during erection, the use of
repair sleeves of a type approved by the Company may be permitted. This shall be at the
discretion of the Company.
Any conductor that has been run-out and not finally tensioned shall not be left overnight either
on the ground or within 4.5 m above ground level. Conductors should never be on the ground.
2.3.4.5 Stringing Procedure
The Contractor shall employ an approved method of tension stringing that will
not cause damage to conductors or over-tension the conductors, and at all
times will not allow conductors to touch ground or any obstacle. The Contractor
shall submit with his tender a general description of both method and type of
equipment he proposes to use.
Cutting of layers of conductors shall be executed with tools designed to
prevent damage to underlying strands.
Page 31
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Cut-ends of conductors and joints, clamps and fittings attached to the
conductors themselves shall be treated in a manner approved by the Company
to prevent ingress of air or moisture.
Conductor, joints and clamps shall be erected so that no bird-caging, overtensioning or other deformation can occur to the individual wires or layers of
the conductor. Clamps or hauling devices shall, under erection conditions,
allow no relative movement of strands or layers of conductors. If required by
the Company, this property shall be demonstrated by actual tests.
Application of tension-clamps shall be executed at pole/tower tops by use of
'come-along' clamps of an approved design.
Transfer of conductors from snatch-blocks to post-top insulators shall not be
effected before completion of anchor-clamps.
Each conductor shall be clamped-in at intermediate poles not later than 48
hours after being tensioned-off at section poles.
Tension gauging marks on conductor shall be applied with white cotton tape
which shall be removed on completion of the fitting of each tension-clamp,
which shall be suitable for live-line working.
2.3.4.6 Sags and Tensions
The Contractor shall prepare the sag and tension charts and calculate
tension values for pre- tensioning which are to be used for erection of 220kV,
132 kV and 33 kV lines. The lines shall be pre-tensioned for a minimum time
of 1 hour and the pretension value shall be maintained by adjustment at 15
minutes intervals during the pre-tensioning period.
For determining tension to be applied to a section having a number of
different spans the 'equivalent span' method shall be used. For sag
measurement a span having a length close to the equivalent span length shall
be chosen.
The Contractor shall submit to PDO for approval the following details applicable
to each conductor or earthwire type used on the contract:
(a)
Final sag and tension charts for a range of equivalent spans applicable
to the transmission line, considering the weight of spacer dampers, aircraft warning
spheres etc. Final sag and tension charts for a range of spans applicable to the
downleads to substations or slack span connections in the line. Sag and tension charts
for downleads and slack spans shall take into account the weights of insulator sets.
(b)
The proposed regime for creep compensation including the basis for
determining initial sag tension sags and tensions.
(c)
Initial sag and tension charts, or tables, for use in the actual sagging of
the line for a range of actual possible conductor temperatures.
Immediately after conductors have been erected and clamped-in, mean sag of conductors
shall not depart from the correct erection sag by more than minus 5%. In addition, sag
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of any one line conductor shall not depart by more than 150 mm from the sag of other line
conductors in the same span.
Vibration dampers or spacer-dampers shall be installed immediately following the clamping
in of a section.
When required by the Company prior to issue of a Certificate of Acceptance, the Contractor
shall be responsible for checking that relative sags of conductors and earthwires are within
the specified tolerance. Such checks shall be conducted at selected points along the route,
as requested by the Company.
Clearances between conductors and ground and between jumpers and structures shall be
checked during erection and before handing over the line.
The Contractor shall provide suitable dynamometers, sighting boards and levels or other
approved apparatus necessary for the proper checking of the Works. When required by
the Company dynamometers shall be tested and if necessary re-calibrated at the
Contractor's expense. Sag adjustment should be done through sighting boards and
sighting levels and sag should be adjusted and measured at mid-span, to the satisfaction of
the Company,
During progress of the Work the Contractor shall record on approved schedules (See
Section 2.6) particulars of sagging of conductors on each section of the route. These
schedules shall show section pole numbers, individual span lengths, equivalent span,
design and erection sags, together with mean actual sag of phase conductors, as well as
both temperature and dates of stringing and checking. At the end of the Contract these
schedules shall be handed to the Company.
Where vertical slope between supports exceeds 20% the Contractor shall make allowance
for the difference in level when calculating the sag.
2.4
INSPECTION AND TESTING
2.4.1
Tests During Erection
2.4.1.1 Conductor Joint Tests
The Contractor, in the presence of the Company, shall accurately measure contact
resistance of all completed clamps, joints and terminal fittings. Where a Joint consists of
several parts bolted together (e.g., dead end clamp with bolted-on jumper terminal),
resistance to be measured is that of the complete assembly. Resistance of any such
fittings shall not exceed 75% of the resistance of an equivalent length of conductor,
measured adjacent to the fittings, and the current carrying capacity shall be at least
100% of that of the conductor. Measurements shall be recorded on Functional Test
Sheet. (See Section 2.6).
The Contractor shall provide suitable equipment (such as a Ductor or an APT/CERL
Digital Micrometer Model DMO 310) for conducting the above tests, and shall submit
details of the proposed instrument to the Company for approval. Suitable clamps also
shall be supplied for connecting current leads of the measuring instrument to the test
Page 33
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sample to provide adequate surface contact at interfaces. Test probes as used for
potential contacts are unsuitable for current connections. Stringing of conductors shall not
commence until the instruments are on Site and ready for use.
2.4.1.2 Cable Tests
Installation of cables used for underground road crossings, etc., shall be
recorded on Check Sheets (see Section 2.6).
Cables shall be subjected to an HV cable DC pressure test whilst disconnected
from the overhead line and associated surge arresters. Results of tests shall be
recorded on Functional Test Sheet FS 14.
2.4.2
Inspection
2.4.2.1
Inspection During Erection
As the erection of the overhead line progresses the Contractor shall ensure that
a record is kept of outstanding items of Work. Check Sheet (see Section 2.6)
shall be used to note exceptions.
2.4.2.2
Final Inspection
Upon notification by the Contractor that a Work section is finished as a
complete line, the Company, prior to issuing the Certificate of Acceptance,
shall inspect the completed Works, in order to ascertain that they have all
been executed in full accordance with the Specifications and Drawings. In
particular it shall be ascertained that:
•
Back-filling of excavations, ramming and levelling around foundations and
stays, disposal of excess earth from excavations, etc., are completed.
•
Steel sections are correctly installed, straight and not damaged.
•
Bolts and nuts are correctly fitted with washers, as equipped, and are
properly tightened and painted to indicate tightness check is complete.
•
•
•
•
•
Stays and accessories are complete and correctly fitted.
Equipment, such as disconnectors surge arrestor , PMR, VT ,AB isolators
and filed isolators
and drop out fuses are fitted correctly and completely in
accordance with the Company Standard Drawings and Specifications, and
are operable without undue difficulties.
Damage to galvanised parts has been made good to the Company's
approval by the application of cold galvanising (zinc rich) paint.
Insulators are clean and totally free from foreign materials and is undamaged.
The Works are erected in complete accordance with the Company
Drawings and Specifications.
•
Cable terminations
•
Correct installation of jumpers and droppers
•
Pole erection and wadi protection
•
phase sequence diagram ( identifying which conductor phase sequence )
•
Line conductors are correctly clamped and made-off.
•
•
Page 34
Structures are free of all construction equipment, loose materials and other
foreign matter.
Anti-climbing devices are correctly installed.
Specification for Installation of Overhead Transmission Lines
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•
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Conductors are clean and without any strand damage.
•
Conductors are erected in accordance with sag and tension schedule
and clearances are correct.
•
Pole identification code plates, danger signs and reflectors are
fitted correctly and Identification Code Schedule (see Section 2.6) completed.
•
All material surplus to requirements and all debris and rubbish have
been removed and deposited as directed by the Company.
Check Sheet (see Section 2.6) shall be completed by the Company to signify to
the Contractor any unsatisfactory Work or outstanding items.
* Detailed earth pits to be included
2.4.3
Pre-Commissioning Tests
Subsequent to the inspection the Contractor in the presence of the Company shall
test lines for:
•
Resistance to earth of each component and each completed earth
system, measured and recorded before final connection. This shall include earth
resistance tests of stay-anchor arrangements.
•
Line continuity, measured with an approved 1 kV Insulation Resistance Tester.
•
Insulation resistance of the line to earth and between phases, measured
with an approved 5 kV Insulation Resistance Tester.
•
Electrical integrity of all tension joints, measured with equipment
designated in Section 2.4.1.1.
If specified in the project specifications, the Contractor shall perform line impedance
test by tests by approved measuring devices like xxx . These shall include the
measurement of:
•
Positive sequence impedance.
•
Zero sequence impedance.
•
the test pack should record the ambient temperature
2.5
MAINTENANCE
The Contractor shall be responsible for making good all settlements of filled ground due
to any cause, whatsoever which may occur up to the end of the period of maintenance.
At the end of the maintenance period specified ground clearance plus conductor creepage
allowance shall not be infringed. In addition, sag of any phase conductor shall not depart by
more than 150 mm from the mean sag of all phase conductors in the same span.
Tests shall be conducted at selected points along the route, as required by the Company,
and the Contractor shall provide the necessary surveying instruments to enable checks
to be conducted with the line live and in service. All sag and clearance corrections that
may be required by the Company shall be undertaken in a prompt manner and at times
specified by the Company, to minimise the service interruption of the line.
2.6
Page 35
CHECK SHEETS AND SCHEDULES
Specification for Installation of Overhead Transmission Lines
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The following Functional Check and Test Sheets shall form part of the As-Built record of the
overhead line.
2.6.1.
Overhead Lines with Lattice Steel Towers
Construction Check Sheets:
•
Installation of Overhead Line Foundation;
•
Erection of Overhead Line Steel Lattice Towers;
•
Painting Check Sheet;
•
Erection/Sag Chart Record;
•
Overhead Compression Joints. Pre-Commissioning Check Sheet:
•
Installation of O/H Lines on Steel Towers - Inspection
•
Installation of O/H Lines on Steel Towers - Tests.
NOTE: *** shall be used to mark-up As-Built drawings and for noting where
pole identification plates are required.
Specimen copies of these check sheets and schedules are located in SP-1100 and
Standard Drawings STD-00-000000-EA-2580-91410-0001.
2.7
AS-BUILT DRAWINGS
As-Built drawings in accordance with SP-1131 shall utilise the contract drawings as the
basis for recording the final status of the installation.
As-Built drawings shall record all deviations, deletions and additions with respect to the
original scope, such as, for example, route changes, pole locations, foundation types, stay
arrangements, and all other variations.
Add more info on the handover , sample of field ohl , sustaining as built drawings –
Need to include points on how we manage OHL as building and how is it structured in PDO
system.
Need to ensure all OHL work including short span runs to be designed and updated into the
system.
Type test certificates for conductors, surge arrestors
APPENDIX A : GLOSSARY OF DEFINITIONS, TERMS AND ABBREVIATIONS
The following terms and abbreviations used in this documents are defined below:
Page 36
Specification for Installation of Overhead Transmission Lines
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General Terminology
Shall
-
The word 'shall' is to be understood as mandatory.
Should
-
The word 'should' is to be understood as strongly recommended.
May
-
The word 'may' is to be understood as indicating a
possible course of action.
The Company
-
Petroleum Development Oman L.L.C. Muscat, Sultanate of Oman.
User
-
A specified Engineer, Consultant or Contractor who
applies these Standards in the execution of a PDO project.
The Company
representative
-
A person appointed from time to time by
the Company, having the functions set forth in Article 2
of General Conditions for Construction Works, and
whose authority shall be notified in writing to the Contractor by
the Company
The Consultant -
The party to the contract with the Company who is
responsible for providing the design, engineering and
other related consultancy services under the contract.
The Contractor -
The party to the Contract with the Company who is
responsible for the construction and other related works
specified in the contract. On occasion, for example in
'turnkey contracts' the contractor may be responsible for
design, engineering, manufacture, shipment, supply,
installation, testing, commissioning and performance
guarantee up to the defects liability period as defined in the
individual contract.
Manufacturer
-
The party responsible for the manufacture of equipment and
services to perform the duties specified by the Consultant,
Contractor or Company.
Vendor/Supplier - A party responsible for the supply of equipment, materials
or product- related services in accordance with the
Purchase Order issued by PDO, its Consultant or
Contractor, or its nominated Purchasing Office.
Works
- All Works to be executed and all services to be rendered by a
Contractor under the terms of a Contract.
Work-site
-
A defined place designated by the Company where all
Works and services shall be executed by a Contractor
under a Contract.
CFDH
-
Corporate Functional Discipline Head
OHL
-
Overhead Transmission Line
Abbreviation
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Specification for Installation of Overhead Transmission Lines
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DCS
-
Document Control Section
DMO
-
Digital Micrometer Model DMO
LV
-
low Voltage
HV
-
High Voltage
Revision:5.0
Effective: August. 20
SP USER-COMMENT FORM
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SP User-Comment Form
If you find something that is incorrect, ambiguous or could be better in an SP, write your comments and
suggestions on this form. Send the form to the Document Control Section (DCS). They make a record
of your comment and send the form to the correct CFDH. The form has spaces for your personal details.
This lets DCS or the CFDH ask you about your comments and tell you about the decision.
SP Details
Number:
Title
Issue Date:
Page number:
Heading Number:
Figure Number:
Comments:
Suggestions:
User’s personal details
Name:
Ref. Ind:
Signature:
Date:
Phone:
Document Control Section Actions
Comment Number:
Dates
Recd:
To CFDH:
CFDH Actions
Recd
Decision:
Reject:
Date:
Accept, revise at next issue:
Accept, issue temporary amendment
Inits:
CFDH
Ref. Ind:
Ref.
Ind:
Date:
Comments:
Originator
Advised:
Page 39
Date:
Inits:
Document Control
Section Advised:
Specification for Installation of Overhead Transmission Lines
Date:
Inits:
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CHECK SHEETS AND
SCHEDULES
Overhead Lines with Lattice Steel Towers
Page 40
Specification for Installation of Overhead Transmission Lines
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PDO
CW-NNNA1
CONSTRUCTION CHECK SHEET
CIVIL WORKS
INSTALLATION OF
OVERHEAD LINE FOUNDATION
PROJECT DESCRIPTION
Sheet 1 of 1
REV 0
DATES
CONTRACT No.
EXCAVATION
LOCATION No.
CONCRETING
TYPE OF FOUNDATION
BACKFILLING
REFERENCE DRAWING
Installation Records
1.
Deviation from alignment of central peg
2.
Depth of excavation
3.
Excavation dimensions (layout)
4.
Undercut (under-ream) dimensions
5.
Chimney/cap dimensions
6.
Pad/foundation base dimensions
7.
Ground water level
8.
Stub angle inclination to vertical (stub rake)
9.
Stub level (on 4 legs)
Specified
Result
10. Face dimensions between stubs
11. Diagonal dimensions between stubs
12. Twist of stub in plan
13. Concrete strength at 28 days (cube/cylinder)
14. Concrete volume
15. Reinforcement weight
16. Protection painting of chimney/cap/stub
17. Backfill compaction
18. Earthing
B.
REMARKS / OBSERVATIONS (include notes on bottom heaving, alignment of excavation walls, side caving, site cleaning etc.):
CONTRACTOR
SIGN & DATE
Page 1
PDO CIVIL WORKS
SIGN & DATE
Specification for Installation of Overhead Transmission Lines
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CW-NNNA2
CONSTRUCTION CHECK SHEET
TOWERS
Sheet 1 of 1
ERECTION OF OVERHEAD LINE
STEEL LATTICE TOWERS
REV 0
PROJECT DESCRIPTION
DATES
ERECTION
START
ERECTION
COMPLETED
FOUNDATION
CONCRETING
CONTRACT No.
LOCATION No.
TOWER TYPE
REFERENCE DRAWINGS
Installation Records
1. Tower verticality deviation (max 1/480)
2. Twisting at crossarm level [degree]
3. Missing tower elements:
3.1. Structural members
3.2. Bolts and nuts
3.3. Washers and fillers
4. Missing tower accessories
4.1. Anticlimbing device
4.2. Step bolts
4.3. Danger plates
4.4. Number plates
4.5. Bird guards
4.6. Circuit plates etc.
5. Tower elements with defects
5.1. Bended, members with distortion
5.2. Uncleaned members
5.3. Members with damaged galvanization
5.4. Members with white rust
5.5. Members with sectional dimensions less than required
5.6. Thickness of galvanizing less than specified
6. Bolts and nuts check
6.1. Grade of bolts
6.2. Tightening by torque wrench:
6.2.1. for 12 mm bolts (min. 6.0 daN.m)
6.2.2. for 14 mm bolts (min. 7.0 daN.m)
6.2.3. for 16 mm bolts (min. 9.7 daN.m)
6.2.4. for 20 mm bolts (min. 17.2 daN.m)
6.2.5. for 22 mm bolts (min. 20.3 daN.m)
6.2.6. for 24 mm bolts (min. 22.0 daN.m)
6.2.7. for 30 mm bolts (min. 25 daN.m)
6.3. Number of threads out of nuts (min.3)
7. Quality of painting
7.1. Stub angle painting
7.2. Tower painting
B.
Result
REMARKS / OBSERVATIONS:
CONTRACTOR
SIGN & DATE
Page 2
PDO CIVIL WORKS
SIGN & DATE
Specification for Installation of Overhead Transmission Lines
Printed 08/09/21
The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.
PDO
CW-NNNA3
CONSTRUCTION CHECK SHEET
CIVIL WORKS
OVERHEAD LINES ON LATICE STEEL TOWERS
PAINTING CHECK SHEET
PROJECT DESCRIPTION
PROJECT WBS No.
SUB-SYSTEM DESCRIPTION
SUB-SYSTEM No.
SERVICE DESCRIPTION
TAG No.
LINE NAME
MINIMUM DFT REQUIRED FOR AIRCRAFT WARNING PAINTING
PRIMER COAT
INTERMEDIATE COAT
FINISH COAT(S)
TOTAL DFT REQUIRED
LOCATION NO.
TOWER TYPE
Date of
Painting
Measurement
READING ON
GALVANISING [μm]
Fabricated Steel Under
5mm
Main
Article 5mm
thick and Member
Article Mark
over
READING ON
PRIMER COAT [μm]
Under
5mm
Main
5mm
thick and Member
over
READING ON
INTERMEDIATE COAT [μm]
Under
5mm
Main
5mm
thick and Member
over
READING ON
FINISH COAT(S) [μm]
Under
5mm
Main
5mm
thick and Member
over
Total Average [μm]
DFT [μm]
Total DFT [μm]
Total DFT requirement
Measured by (Contractor)
Name
Checked by (Consultant)
Name
Signature
Supervised by (PDO)
Name
RANDOM
Page 3
Signature
Specification for Installation of Overhead Transmission Lines
Printed 08/09/21
The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.
REMARKS
Signature
μm
μm
μm
μm
PDO
E-NNNA4
CONSTRUCTION CHECK SHEET
Sheet 1 of 1
OVERHEAD LINES ONELECTRICAL
LATTICE STEEL TOWERS
ERECTION/SAG CHART RECORD
PROJECT
DESCRIPTION
PROJECT WBS No.
SUB-SYSTEM
DESCRIPTION
SUB-SYSTEM No.
SERVICE
DESCRIPTION
TAG No.
A.
REV 0
INDENT / CONTRACT No:
OVERHEAD LINE FROM:
TO:
SAGGING SECTION FROM:
TO:
B.
INSPECTION
1.
Section length
2.
Equivalent span
3.
Ambient temperature (°C)
4.
Conductor temperature (°C)
5.
Sagging Tower No. to Tower No.
6.
Check Span Tower No. to Tower No.
7.
Sagging span length (m)
8.
Check span length (m)
9.
Dynamometers
Result
10. Thermometers
11. Sighting Boards
12. Sagscope
13. Final Sag (m)
14. Conductor Tension (kg)
15. Midspan Joints (between Tower Nos.)
16. Conductor Repair Sleeves (between Tower Nos.)
C.
REMARKS / OBSERVATIONS:
COMPLETED BY CONTRACTOR
APPROVED BY CONTRACTOR
ACCEPTED BY PDO
NAME
NAME
NAME
COMPANY
COMPANY
REF. IND.
SIGN & DATE
SIGN & DATE
SIGN & DATE
Page 4
Specification for Installation of Overhead Transmission Lines
Printed 08/09/21
The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.
PDO
E-NNNA5
CONSTRUCTION CHECK SHEET
Sheet 1 of 1
ELECTRICAL
OVERHEAD COMPRESSION
JOINTS
PROJECT
DESCRIPTION
PROJECT WBS No.
SUB-SYSTEM
DESCRIPTION
SUB-SYSTEM No.
SERVICE
DESCRIPTION
TAG No.
A.
REV 0
INDENT / CONTRACT No:
LOCATION:
SECTION LENGTH:
DRAWING REF NO:
TYPE OF STRUCTURE:
TENSION / SUSPENSION
OPERATING VOLTAGE:
CONDUCTOR TYPE:
CONDUCTOR SIZE:
B
TEST
Results
Tower No
C
R-phase
Y-phase
B-phase
Shieldwire
REMARKS / OBSERVATIONS:
COMPLETED BY CONTRACTOR
APPROVED BY CONTRACTOR
ACCEPTED BY PDO ELECTRICAL
NAME
NAME
NAME
COMPANY
COMPANY
REF. IND.
SIGN & DATE
SIGN & DATE
SIGN & DATE
Page 5
Specification for Installation of Overhead Transmission Lines
Printed 08/09/21
The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.
PDO
E-NNNB1
PRE-COMMISSIONING CHECK SHEET
ELECTRICAL INSTALLATION OF OVERHEAD
Sheet 1 of 2
LINES ON LATTICE STEEL TOWERS
REV 0
INSPECTION
PROJECT
DESCRIPTION
PROJECT WBS No.
SUB-SYSTEM
DESCRIPTION
SUB-SYSTEM No.
SERVICE
DESCRIPTION
TAG No.
A.
INDENT/CONTRACT No:
LOCATION:
SECTION LENGTH:
POLE REF No:
DRAWING REF No:
TYPE OF STRUCTURE:
□ TENSION
OPERATING VOLTAGE:
CONDUCTOR TYPE:
CONDUCTOR SIZE:
□ SUSPENSION
SAG / TENSION DRAWING REF No:
WORK COMMENCED ON:
WORK COMPLETED ON:
B.
INSPECTION
Results
1.
Check and ensure that foundations are correctly installed
2.
Check towers for mechanical damage
3.
Check and ensure that all bolts and nuts are correctly fastened.
4.
Check and ensure that the towers verticality tolerances are observed.
5.
Check and ensure that backfilling, compacting and leveling are completed
6.
Check and ensure that damages to galvanising or painting are repaired
7.
Check and ensure that all the fittings are tightened and painted to specification requirements
8.
Check and ensure that all the insulators are clean
9.
Check and ensure that line conductors are correctly clamped/strapped
10. Check and ensure that anti-climbing devices, danger & reflector plates, number plates, phase plates and
name plate are fitted in correct position.
11. Check and ensure that there are no damages to the conductor (strand damages)
12. Check and ensure that sagging is correct and the records submitted.(E-NNNA2)
13. Check and ensure that jumpers for all phases are fixed and the necessary clearances maintained
Page 6
Specification for Installation of Overhead Transmission Lines
Printed 08/09/21
The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.
PDO
PRE-COMMISSIONING CHECK SHEET
E-NNNB1
ELECTRICAL INSTALLATION OF OVERHEAD
Sheet 1 of 2
LINES ON LATTICE STEEL TOWERS
REV 0
INSPECTION
14. Conduct a random check to ensure that all the clearances are correct and in accordance with specification
requirements
PROJECT
DESCRIPTION
PROJECT WBS No.
SUB-SYSTEM
DESCRIPTION
SUB-SYSTEM No.
SERVICE
DESCRIPTION
TAG No.
INSPECTION
Results
15. Check and ensure that the stub angles and foundation cap is painted according to specification
requirements.
16. Check and ensure that there are not cracks on foundation cap (except hair cracks of max. 0.3mm).
17. Check and ensure that there are not bended elements on tower structure.
18. Check and ensure that there are not missing members on tower structure.
19. Check and ensure that all temporary earth and excess material are removed
20. Check and ensure that all tower areas are shaped to eliminate water ponding
21. Check and ensure that the area around the tower foundations is leveled and all excess earth removed
22. Ensure that tower painting inspection reports are attached.
23. Record the actual clearance at all road/river crossings.
C.
REMARKS / OBSERVATIONS:
COMPLETED BY CONTRACTOR
NAME
Page 7
APPROVED BY CONTRACTOR
NAME
Specification for Installation of Overhead Transmission Lines
ACCEPTED BY PDO
NAME
Printed 08/09/21
The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.
PDO
PRE-COMMISSIONING CHECK SHEET
E-NNNB1
ELECTRICAL INSTALLATION OF OVERHEAD
Sheet 1 of 2
LINES ON LATTICE STEEL TOWERS
INSPECTION
REV 0
COMPANY
COMPANY
REF. IND.
SIGN & DATE
SIGN & DATE
SIGN & DATE
PROJECT
DESCRIPTION
PROJECT WBS No.
SUB-SYSTEM
DESCRIPTION
SUB-SYSTEM No.
SERVICE
DESCRIPTION
TAG No.
A.
INDENT / CONTRACT No:
LOCATION:
SECTION LENGTH:
DRAWING REF NO:
TYPE OF STRUCTURE:
TENSION / SUSPENSION
OPERATING VOLTAGE:
CONDUCTOR TYPE:
CONDUCTOR SIZE:
FROM TOWER NO:
TO TOWER NO:
SAG / TENSION DRAWING REF NO:
B
TEST
Results
1.
Ensure that prior to Site Tests, the Contractor provides Type Test and Routine Test Certificates
confirming that during factory tests of equipment, the criteria for the behavior of the test object
have been fulfilled and all tests have been passed successfully.
2.
Ensure that pre-commissioning checks have been carried out and the relevant Construction
Test sheet completed
3.
Ensure that earth electrodes have been tested and relevant Functional Test sheets completed
4.
Ensure that compression joints tested and relevant Functional Test sheets completed
5.
Place danger notices and cordon off the test area
6.
Ensure that at tower locations subject of special requirements of safety of public Step and
Touch Voltage measurements have been performed and special earthing installed
7.
Measure line resistance (complete):
8.
R-phase to Y-phase (Ω)
9.
Y-phase to B-phase (Ω)
10. R-phase to B-phase (Ω)
11. Ensure OTDR measurements are within the required / guaranteed limits and relevant test
sheets are attached.
12. Ensure that the results of Optical Acceptance Test (end to end) are within the required /
guaranteed limits and relevant test sheets are attached.
C.
REMARKS / OBSERVATIONS:
COMPLETED BY CONTRACTOR
NAME
Page 8
APPROVED BY CONTRACTOR
NAME
Specification for Installation of Overhead Transmission Lines
ACCEPTED BY PDO ELECTRICAL
NAME
Printed 08/09/21
The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.
PDO
PRE-COMMISSIONING CHECK SHEET
ELECTRICAL INSTALLATION OF OVERHEAD
E-NNNB1
Sheet 1 of 2
LINES ON LATTICE STEEL TOWERS
INSPECTION
REV 0
COMPANY
COMPANY
REF. IND.
SIGN & DATE
SIGN & DATE
SIGN & DATE
Page 9
Specification for Installation of Overhead Transmission Lines
Printed 08/09/21
The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.