norsok
NORSOK Standard
standard
L-004:2016
ICS 913.07
Language: English
Piping fabrication, installation, flushing and
testing
© NORSOK. Inquiries regarding reproduction are to be made to Standard Online AS. www.standard.no
;
;
This NORSOK standard is developed with broad petroleum industry participation by interested parties in the
Norwegian petroleum industry and is owned by the Norwegian petroleum industry represented by the Norwegian Oil
and Gas Association and The Federation of Norwegian Industries. Please note that whilst every effort has been
made to ensure the accuracy of this NORSOK standard, neither the Norwegian Oil and Gas Association nor The
Federation of Norwegian Industries or any of their members will assume liability for any use thereof. Standards
Norway is responsible for the administration and publication of this NORSOK standard.
Standards Norway
P.O. Box 242, 1326 Lysaker
NORWAY
Visiting address
Mustads vei 1, 0283 Oslo
Copyrights reserved
Telephone: + 47 67 83 86 00
Fax: + 47 67 83 86 01
Email: petroleum@standard.no
Website: www.standard.no/petroleum
NORSOK Standard
L-004:2016
Piping fabrication, installation, flushing and testing
Contents
Foreword
5
1
Scope
.7
2
Normative referanser
1
3
Terms and definitions
.8
4
Abbreviation
.8
5
Materials
5.1
Marking of materials
Material storage, handling, receiving and identification control
5.2
.9
.9
.9
6
Fabrication of pipework
6.1
General requirements
6.2
Welding and NDE
6.3
Metering and orifice runs
6.4
Screwed pipework
6.5
Dimensional tolerances for p re-fabricated piping assemblies ..
6.6
Branch connections and outlets
Pipe flanges, mechanical hub and clamp coupling
6.7
.9
.9
.9
10
10
11
12
13
7
Installation of piping
Pipework erection
7.1
7.2 Flanged joints
7.3
Strain sensitive equipment with flange connections
7.4 Gaskets
7.5
Bolting
Pipe support
7.6
7.7 Global tolerances, installation
13
13
13
14
14
15
15
15
8
Cleaning of pipework
16
16
16
16
17
8.1
8.2
8.3
8.4
8.5
8.6
9
General
Flydro flushing
Pressurised air shockblowing
Pneumatic flushing
Soft pigging
Verification of cleanness
Pressure tests
General
9.1
9.2
Test preparation
9.3
Test media
9.4
Hydrostatic testing
9.5 Pneumatic testing
9.6 After completion of test
Test documentation
9.7
17
17
17
17
17
18
18
19
19
19
10 Chemical cleaning
10.1 General
10.2 Documentation
.20
.20
.20
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11 Hot oil flushing
11.1 General
11.2 Marking
11 .3 Documentation
.21
.21
.21
.21
12 Tightness testing
.22
13 System colour coding of piping
13.1 Purpose
13.2 Types of markers
.23
.23
.23
.23
.23
.23
.23
.23
.23
.23
.24
.24
.24
.24
.24
.24
.25
.25
.25
.25
13.2.1General
13.2.2Adhesive band/plastic tape glued to the pipe surface
13.2.3Laminated plastic signs
13.2.4Laminated plastic signs, mounted in aluminium or stainless steel frame brackets
13.3 Insulated lines
13.4 Plastic/rubber lined piping
13.5 Obstruction
1 3.6 Materials of markers
1 3.6.1 Adhesive tape/band
13.6.2Laminated plastic signs
13.7 Fastening materials
13.8 Marker text
13.9 Size and use of markers
13.10 Positioning of markers
13.1 1 Valve marking
13.12 Fluid description/colour code tabulation
13.13 Colour coding information
Annex A (normative) Alternative test methods
.26
Annex B (informative) Requirements for internal treatment of piping after prefabrication and installation
.28
before commissioning
4
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NORSOK L-004:2016
Foreword
NORSOK L-004:2016 was adopted as NORSOK Standard in July 2016.
NORSOK L-004:2016 supersedes NORSOK L-004 Rev. 2, September 2010.
The NORSOK standards are developed by the Norwegian petroleum industry to ensure adequate safety,
added value and cost effectiveness for petroleum industry developments and operations. Furthermore,
NORSOK standards are as far as possible intended to replace oil company specifications and serve as
references in the authorities' regulations.
The NORSOK standards are normally based on recognized international standards, adding the provisions
deemed necessary to fill the broad needs of the Norwegian petroleum industry. Where relevant,
NORSOK standards will be used to provide the Norwegian industry input to the international
standardisation process. Subject to development and publication of international standards, the relevant
NORSOK standards will be withdrawn.
The NORSOK standards are developed according to the consensus principle, generally applicable
standards work and according to established procedures defined in NORSOK A-001N.
The NORSOK standards are prepared and published with support by the Norwegian Oil and Gas
Association, the Federation of Norwegian Industries, Norwegian Shipowners’ Association and The
Petroleum Safety Authority (PSA) Norway.
NORSOK standards are administered and published by Standards Norway.
Annex A is normative.
Annex B is informative.
Revision information, 3rd edition updates:
The new edition has been given a general update that clarifies and simplifies requirements. Non relevant
requirements have been removed and the revision should also be more in line with industry practice.
Additional information has been included in the fabrication, cleaning and flushing and test requirements of
pipework. The work has also focused on developing a standard with simpler and cost efficient solutions.
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6
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1 Scope
This NORSOK standard covers the basis for fabrication, installation, flushing, pressure testing, chemical
cleaning, hot oil flushing and system colour coding of process, drilling and utility piping for offshore oil
and/or gas production facilities.
This NORSOK standard does not cover the following:
• all instrument control/signal tubing downstream of first piping block valve;
• subsea pipework and risers;
• flexible hoses;
• sanitary piping systems within living quarters and other domestic areas, see NORSOK H-003;
• GRP piping, see ISO 14692 all parts;
• marine systems in hulls of vessels and floating platforms and land based plants.
2 Normative referanser
The following standards include provisions and guidelines, which through reference in this text, constitute
provisions and guidelines of this NORSOK standard. Latest issue of the references shall be used unless
otherwise agreed. Other recognized standards may be used provided it can be shown that they meet the
requirements of the referenced standards
API 6A, API standard 6A
ASME B31 .3, Process Piping
ASME B1.20.1, Pipe Threads, General purpose, Inch
ASME PCC-1 , Guidelines for Pressure Boundary Bolted Flange Joint Assembly
ASME VIII, Boiler and Pressure Vessel Code, Section VIII - Rules for construction of Pressure Vessels,
Division 1
EN 1591(all parts), Flanges and their joints - Design rules for gasketed circular flange connections
EN ISO 27509, Petroleum and natural gas industries-Compact flanged connections with IX seal ring
ISO 4406, Hydraulic fluid power - Fluids - Method for coding the level of contamination by solid particles
ISO 9095, Steel tubes - Continuous character marking and colour coding for material identification
Norsk Olje og Gass, Handbok for flensarbeid
NORSOK 1-1 06, Fiscal metering systems for hydrocarbon liquid and gas
NORSOK L-001, Piping and Valves
NORSOK L-002, Piping design, layout and stress analysis
NORSOK L-CR-003 (L-003), Piping details
NORSOK L-005, Compact flanged connections
NORSOK M-601, Welding and inspection of piping
NORSOK M-630, Material data sheets and element data sheets for piping
NORSOK Z-D P-002, Coding system
NORSOK Z-006, Preservation
NS 813, Piping systems - Identification colours for the content
NS 4054, Colours for identification
NORSOK ©2016
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3 Terms and definitions
For the purposes of this NORSOK standard, the following terms and definitions apply:
3.1
shall
expression in the content of a document conveying objectively verifiable criteria to be fulfilled and from
which no deviation is permitted if compliance with the document is to be claimed
Note 1 to entry: Requirements are expressed using the verbal forms specified in ISO/IEC Directives, Part 2 clause
7.2 Table 3.
3.2
should
expression in the content of a document conveying a suggested possible choice or course of action
deemed to be particularly suitable without necessarily mentioning or excluding others d
Note 1 to entry: Recommendations are expressed using the verbal forms specified in ISO/IEC Directives, Part 2
clause 7.3 Table 4.
Note 2 to entry: In the negative form, a recommendation is the expression that a suggested possible choice or
course of action is not preferred but it is not prohibited.
3.3
may
expression in the content of a document conveying consent or liberty (or opportunity) to do something
Note 1 to entry: Permissions are expressed using the verbal forms specified in ISO/IEC Directives Part 2 clause
7.4 Table 5.
3.4
can
expression in the content of a document conveying expected or conceivable material, physical or causal
outcome
4 Abbreviation
For the purposes of this NORSOK standard, the following abbreviations apply:
ABS
absolute
API
American Petroleum Institute
ASME
American Society of Mechanical Engineers
CO2
carbondioxid
EDS
element data sheet
EN
European Standard
GRP
glass fibre reinforced plastic
He
helium
ISO
International Organisation for Standardisation
IX
special metallic seal ring, see NORSOK L-005
N2
nitrogen
N2He
nitrogen helium
NDE
non destructive examination
NPS
nominal pipe size
NPT
National Pipe Thread Taper
NS
Norwegian Standard
O2
oxygen
8
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OD
outside diameter
P&ID
piping and instrument diagram
PAS
pressurised air shock blowing
ppm
parts per million
PVC
polyester vinyl chloride
UV
ultra violet
5 Materials
5.1 Marking of materials
A system of marking of materials shall be established. Colour coding according to ISO 9095 can be a
solution.
If possible, gaskets shall be marked to be visible after installation.
5.2 Material storage, handling, receiving and identification control
Procedures for off-loading, storage, receiving, control, traceability and inspection of piping material
supplied for fabrication and installation shall be established.
In general, the following applies:
• storage and preservation should adhere to requirements in NORSOK Z-006;
• piping and piping equipment shall be protected against degradation and damages during storage;
• materials shall be segregated to avoid any cross contamination;
• piping and piping equipment shall be protected against damage during handling from supplier to
fabrication yard and further to final installation plant. Especially focus shall be made to sealing
surfaces, bevelled areas, and contact between different material qualities to avoid surface
contamination. This also includes protection during erection phase in order to protect against
contamination from other activities on site.
6 Fabrication of pipework
6.1 General requirements
Prefabricated pipe spools shall be cleaned, coated (if required) and preserved prior to installation.
The fabrication yard shall be outfitted for work with relevant materials. Intermediate storing, lifting devices
and handling equipment shall have a surface not causing contamination of the materials they are used
for. All tools shall be restricted to the relevant material group to avoid contamination and shall be marked
to avoid mixing of tools for different materials. Different grades of stainless steel materials can be handled
with the same tools.
Fabrication of high alloy piping including titanium shall take place in sufficiently clean areas separated
from areas where carbon steel piping is fabricated to avoid contamination.
All welded attachments to piping, including pads and doubler plates, shall be of a material compatible with
the piping material.
Bending and forming of pipe shall be carried out in accordance with ASME B31.3, NORSOK M-630 (EDS
NBE1 and EDS NBE2) and shall be carried out according to documented procedures.
6.2 Welding and NDE
All welding and NDE shall be in accordance with NORSOK M-601. Separation between welds shall be
arranged to eliminate or minimise the heat transfer from adjacent welds.
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NORSOK L-004:2016
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Figure 1 - Recommended distance between welds
where:
Separations S = Sp or Sa as applicable
Sp
= separation between any two pressure containing welds
yjDxt (mm) minimum
Sa
= separation between an attachment weld an any other weld
= the greater of 2t or 40 mm minimum
NOTE 1: When re-welding match-arced sections of welded pipe it is not necessary to achieve this staggering of
the longitudinal weld.
Unless otherwise recommended by the valve/ equipment manufacturer, internals of in-line valves and
equipment that could be damaged due to heat transfer shall be removed prior to welding and/or heat
treatment.
6.3 Metering and orifice runs
For fiscal metering runs, reference is made to NORSOK 1-106.
When the design of metering and orifice run necessitates welds, these shall be ground smooth and flush
with the inside of the pipe, if the measurement accuracy so requires. Pipe-tap connections where
required, shall be drilled through the pipe wall and be smooth inside.
6.4 Screwed pipework
Unless otherwise stated on approved drawing or specifications, pipe threads shall conform to ASME
B1.20.1.
NPT threads need special attention to dimensional tolerances due to the conic configuration. Minimum
engagement shall be 4.5 for NPT threads.
All threading shall be carried-out after bending, forging or heat treatment, but where this is not possible,
suitable thread protection shall be provided.
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NORSOK L-004:2016
6.5 Dimensional tolerances for pre-fabricated piping assemblies
Dimensional control of prefabricated piping spools shall be performed in a systematic manner, assuring
that the final installation will be correct. Prefabricated spools for offshore installation shall be 100 %
dimensionally controlled. The tolerances on linear dimensions (intermediate or overall) are illustrated in
Figure 2 and Figure 3. These tolerances are not accumulative and should be considered as the max
allowable tolerance for single spool and multiple spool assemblies.
Angularity tolerances across the face of flanges, weld end preparation and rotation of flanges shall be as
stated in Figure 2 and Figure 3.
Closer tolerances on weld end preparations than stated in Figure 2 and Figure 3, may be specified in the
relevant welding specification for the material in question, and shown on the fabrication isometric(s).
When closer tolerances other than those given above are required, these shall be as specified on the
isometric drawing in question.
JL
L
3 mm per 1 m
Max 6 mm
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E3-JL
L[m]
L
T
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Tolerances [mm]
<6
>6
+5
± 10
+ 1,5
+ 1,5
Figure 2 - Tolerances for prefabricated piping assemblies
NORSOK ©2016
11
NORSOK L-004:2016
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L2
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Tolerances [mm]
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12 in £ d £
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Tolerances [mm]
±5
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d >20 in
±5
±5
±3
±1,5
±3
X"
I
NOTE 1 Before reworking any spools contact engineering department in order to check complete isometric.
NOTE 2 Cut to fit requirement to be stated on fabrication isometrics (typically 100 mm).
NOTE 3 Bolt holes on flanges shall straddle the horizontal or vertical lines or plant north/south centre lines when
orientation is not given on drawings.
Figure 3 - Tolerances for prefabricated straight piping assemblies
6.6 Branch connections and outlets
Branch connections shall be welded to the header with full penetration welds.
Stub-in connections shall be set-on type, ref. ASME B31.3. Set-in type is not acceptable.
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NORSOK L-004:2016
O’lets and stub-in connections shall be ground smooth and flush with inside of pipe.
For weldolets, a full penetration groove weld shall be performed out to the weldolets outside diameter and
shall be finished with a cover fillet weld. The minimum cover weld throat thickness, tc, applies when the
angle between the branch fitting groove weld face and the run pipe surface is less than 135°. For areas
where the angle between the groove weld face and the run pipe surface is 1 35° or greater, the cover weld
may transition to nothing. Minimum tc = 6 mm (1/4 in). Cover welds shall be provided with a smooth
transition to the run pipe.
Reinforcement pads and saddles required by specifications and drawings shall be of the same material
as the main pipe (unless specified otherwise) and shall be formed to provide a good fit to both main and
branch pipe. Pads and saddles shall have rounded corners, recommended radius 50 mm.
Branch reinforcement pads shall be according to ASME B31.3. Branch reinforcement pads or each
segment thereof shall be provided with a minimum 3,0 mm drilled and tapped hole prior to fitting to the
pipe, to ensure leak detection, venting and testing facilities. This applies for saddles and pads covering a
weld not previously hydrostatically pressure tested. Whenever possible, pad should be made in one piece
before fitting onto pipe. After welding and testing the hole shall be permanently plugged, e.g. welded or
metal plug in piping material.
6.7 Pipe flanges, mechanical hub and clamp coupling
Seal faces of mechanical hub and clamp couplings and flanges shall be protected during fabrication and
storage. Where possible, hub and clamp couplings shall be protected by fitting and hand tightening the
complete coupling assembly.
Particular attention shall be paid to protection of compact flange seal faces. Reference is made to
requirements in EN ISO 27509
7 Installation of piping
7.1 Pipework erection
All pipes, fittings, valves and inline equipment shall be inspected before erection to ensure that they are
free from loose contamination.
Pipework shall be erected on permanent supports designated for the line. Temporary supports shall be
kept to an absolute minimum, but is acceptable to an extent sufficient to protect nozzles and adjacent
piping from excessive loads during the erection.
Pipework shall be fitted without springing or forcing to avoid undue stressing of the line or strain being
placed on a vessel or item of equipment, etc.
All temporary pipe spools and supports that are an aid to erection, testing/flushing, sea fastening, etc. are
to be specially marked for removal identification.
Flange covers shall be retained on all flange connections to valve or equipment, until ready to connect the
mating piping. All equipment shall be blanked, either by pressure test blanks, spades or blinds, to stop the
ingress of debris.
7.2 Flanged joints
Before assembly, flanges shall not have any damage that will interfere with the integrity of the joint. The
flanges shall be clean and free from any rust, dirt or other contamination. The joints shall be brought up
flush and square without forcing so that the entire mating surfaces bear uniformly on the gasket and then
mated-up with uniform bolt tension, see 6.5 and 7.5.
With the piping flange fitted and prior to bolting-up the joint, the following shall be maintained:
• bolts shall move freely through accompanying bolt-holes at right-angle to the flange faces;
• there shall be a clear parallel gap between two flange faces to allow for the gasket installation. There
shall be sufficient flexibility, in the piping layout, to install and replace gaskets.
Sealing surfaces like the sealing area of hubs for clamp connectors and the heel of compact flanges are
vulnerable to damage from corrosion and rough handling and need special attention.
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For handling, installation and assembly of compact flanges, see EN ISO 27509.
7.3 Strain sensitive equipment with flange connections
Flanges connecting to strain sensitive mechanical equipment (e.g. pumps, compressors, turbines, etc.)
shall be fitted-up in close parallel and lateral alignment prior to tightening the bolting. Unacceptable forces
transferred on to the nozzles shall be prevented.
To achieve this true alignment, full advantage shall be taken of the 'cut to fit' allowances and loose
flanges provided.
With reference to NORSOK L-002, connections to strain sensitive equipment shall always be subject to
stress analysis with observed and measured misalignment.
As a minimum the following shall be evaluated:
• the stiffness of the system;
• sufficient tightening force for flange connections;
• allowable nozzle loads for the equipment.
With the piping flange fitted and prior to bolting-up the joint, the tolerances shown in Figure 4 shall be
maintained.
Maximum angular misalignment
B
JU
D < 3" : (A- B) < 0,2 mm
4" < D < 14" : (A — B) < 0,3 mm
D > 14" :
(A-B)x 1000
D1
D
< 1,0
D1
A
Figure 4 - Flange alignment for strain sensitive mechanical equipment
In general, flange connections to equipment shall be the last connection made on completion of a line or
interconnecting system of lines.
7.4 Gaskets
Gaskets (all types) shall be treated in accordance with manufacturers' instructions. Gaskets such as flat
gaskets, spiral wounds and ring joints should normally not be re-used. Gaskets may be re-used
considering the following:
• gasket condition;
• criticality of service;
• leak test regime.
Gaskets shall not extend into the bore of pipe.
Ring type joints (RTJ) rings are recommended to be lightly smeared on the mating surface with an anti¬
friction lubricant prior to fitting between the flange grooves. Anti-friction lubricant, compatible with the
flange material and process fluid shall be used. Ring type joints are sensitive to over-torque, care should
be taken to select the correct torque figures to prevent plastic deformation of ring groove. The impact of
reduced friction due to lubrication shall be considered and bolt torque figures reduced accordingly.
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NORSOK L-004:2016
7.5 Bolting
Bolting shall be in accordance with NORSOK L-001, or the piping specification for the project.
Bolt tightening shall be calculated according to a recognized industry standard, e.g. ASME VIII, ASME
PCC-1, API 6A or EN 1591.
Manually torqued flange bolts and stud bolts shall extend fully through their nuts with minimum one
thread.
To achieve the required bolt tension lubrication is important, all flange bolts, stud bolts threads as well as
nut spot faces shall be thoroughly lubricated prior to fitting.
All flanged stud bolts shall be progressively controlled to equalise bolt pressure on the gasket. A detailed
procedure shall be developed prior to start.
All bolted flange connections shall have controlled tightening by means of manual torque wrenches or
hydraulic bolt tightening.
Hydraulic bolt tightening (tension or torque) shall be used on all bolts greater than 1 inch (nominal pipe
size) in diameter. If required, the bolts shall have extra length of 1 x bolt diameter in order to
accommodate tensioning tool.
The Contractor is responsible to have a traceable system to document all bolted flange connections
tightening by means of manual torque wrenches or hydraulic tightening. The flange connections shall be
marked on a suitable document, e.g. a mark-up isometric drawing, “kontroll og aktivitetsskjema" in Norsk
Olje og gass: Handbok for flensarbeid, or by using an electronically tracking system for flange tightening.
Information shall include, but not be limited to the following information:
• piping class;
• tension/torque;
• nominal flange size, pressure class, bolt size and length;
• type of tool and hydraulic pump pressure;
• date and signature by the operator.
Nuts and bolts shall have their grade marks visible after installation. Stud bolts cut from long lengths of
studding shall have material grade stamped on the end of each cut.
7.6 Pipe support
Pipe supports shall be in accordance with the valid pipe support detail drawings developed for the project.
For lines subject for comprehensive stress analysis ref. NORSOK L-002, contractor shall ensure that the
stress isometric drawings fully comply with the installed system with regard to pipe routing, pipe support
locations and support functionality.
Piping shall not be forced to fit with support locations in such a manner that additional stress is
introduced.
Where spring supports are installed, the spring shall be in fixed position with preinstalled load until
mechanical complete is achieved.
Pipes shall not be supported by other pipes, i.e. individual supporting is required. Bracing is, however,
allowed according to NORSOK L-CR-003.
Vent holes in wear plates and trunnions is not required. However, when the wear plate or a trunnion
covers a circumferential weld that has not been pressure tested, a vent hole is required for leak detection
see 6.6.
7.7 Global tolerances, installation
Hook-up termination points shall be within ±25 mm in all directions. Extra length may be provided, where
required.
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NORSOK L-004:2016
8 Cleaning of pipework
8.1 General
All pipework shall be free from all foreign materials (e.g. as dirt, grease, oxide scale, weld deposits and
temporary protective coating) which could cause operational disturbances for the relevant service class.
NOTE: SS316 materials have proven to be subject to extensive crevice and pitting corrosion. If this material is
used, special care to protect external surfaces is recommended.
Cleanliness shall be documented by visually inspection (including video, boroscope etc) of critical parts of
the system, as agreed with Company. If system proves to have adequate cleanliness, no further flushing
activity is required.
The initial flushing shall be carried out prior to any pressure testing. For CRA (corrosion resistant alloys)
steelwork flushing can be performed after pressure testing, upon agreement.
General requirements for flushing for specific systems are listed in Table B.1.
All flushing shall be performed according to a documented procedure.
All items that can be damaged during cleaning shall be removed, substituted with temporary pipe spools
or blocked prior to cleaning, e.g. pressure gauges, flow meters, signal sensors, relief valves, permanent
strainers, check/globe/control valves having reduced cross sectional areas, rupture discs, orifice plates,
instrument probes, thermowells, connection to vessels/pumps level instruments, etc.
8.2 Hydro flushing
Items of equipment which would be sensitive to damage during hydro flushing shall be removed, blocked
off or isolated. A list shall be prepared and be part of the flush and test procedure.
Valves not removed from the line shall be flushed in fully open position. Removed valves may be installed
when flushing is completed and prior to pressure testing, provided the fabrication contractor has verified
acceptable cleanness of the system.
For flanged riser- and pipeline valves, the valves shall not be installed before flushing, pressure testing
and all clean-up pigging operations of the pipelines are completed.
For welded in riser valves shall the pigging sleeves be used during all pressure testing activities and
clean-up pigging operations of the pipelines. Valve internals shall be installed when all pipeline and riser
activities are completed.
All piping systems that require hydro flushing shall be flushed using high pressure jet flushing equipment,
e.g. rotating hose or rotating nozzle. Minimum pressure shall be 60 MPa, and in the range 100 litres to
150 litres per minute.
The connection points shall be located such that all parts of the system are properly flushed.
The piping system shall be hydro flushed to ensure that weld deposits are removed.
The flushing medium shall be fresh water, the chloride ion content shall be less than 50 x 10'6 mg/L
(50 ppm), the pH value shall be between 6,5 and 9,5.
After flushing the piping systems shall be completely drained and corrosion protected as required to
prevent corrosion during intermediate periods until further cleaning or testing takes place.
8.3 Pressurised air shockblowing
This method may be used as an initial cleaning method for instrument air, plant air and as an alternative
method for initial cleaning of small bore pipe (2 inch and less). This method may also be used when there
are problems removing trapped liquid in the circuit, or to verify cleanness of small bore pipe where video
inspection is impossible or inadequate due to pipe dimension or configuration.
When using PAS method for cleaning or verification the procedure shall be repeated until cleanness is
acceptable.
The air shocking pressure shall never exceed the system design pressure and shall never be more than
0,8 MPa. Safety precaution shall be taken when this method is used.
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8.4 Pneumatic flushing
In cases where water is not desirable in the piping system (e.g. instrument/utility air), flushing by
pressurised air or PAS shall be carried out. When pressurised air is used, the minimum velocity shall be
35 m/s.
Procedure covering all safety aspects shall be established.
8.5 Soft pigging
Soft pig can be propelled using compressed air, vacuum, or water. Pressure shall not exceed design
pressure of the system. When using compressed air, a procedure covering all safety aspects shall be
established.
A procedure developed for the operation shall describe in detail the arrangement for catching/receiving
the pig in a safe manner.
Items which can be sensitive to damage during soft pigging shall be removed. Inline valves except
through conduit type valves shall be removed. Through conduit type valves shall be fully open.
When using soft pigging for cleaning or verification the procedure shall be repeated until level of
cleanness is acceptable.
8.6 Verification of cleanness
; All systems shall be internal visual inspected for acceptable cleanness by spot check. Internal visual
inspection includes the use of video or equivalent equipment.
•
If pipe configuration in critical parts of systems as defined in Table B.1 is too complicated for visual
i inspection, the PAS method or other suitable methods shall be used for verification of cleanness.
9 Pressure tests
9.1 General
The test pressure for hydrostatic and pneumatic testing shall, unless otherwise specified, be in
accordance with ASME B31.3. The test pressure shall be calculated based on the maximum design
pressure of the piping class (not the design pressure of the individual line) at 20 °C.
Special requirements for pressure testing of GRP plastic piping shall be clarified with the manufacturer.
The following are excluded from pressure tests:
• all small bore instrument control piping/tubing downstream of the first piping block valve;
• open drains and vents to atmosphere (hydrostatic test with liquid fill).
For alternative testing of tie-in welds, see Annex A.
9.2 Test preparation
Pressure, temperature and time recorders shall be used for all pressure tests. The pressure shall be
shown in barg. Pressure and temperature gauges and recorders shall be calibrated in accordance with
recognized calibration standards. Test equipment shall include suitable over-pressure protection adjusted
to applicable test pressure.
Minimum of one gauge shall be positioned at the highest point and one recorder to be positioned at the
lowest point. Accuracy of pressure gauge shall be at least 1 % to 2 % at full scale and 1 % to 2 % for the
recorder. Pressure gauge and recorder shall have adequate resolutions to accurately determine test
pressure.
If there is a deviation of more than 2 % between gauge and recorder during test, the test shall be stopped
and the equipment recalibrated.
All piping joints, welds, including those used in the manufacturing of welded pipe and fitting, and structural
attachment welds to pressure-containing components, and connections, shall not be insulated or
physically covered until satisfactory completion of testing. All joints may be primed and painted prior to
pressure testing.
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All piping shall be adequately supported before the pressure test. Spring or other variable type supports
shall be temporary blocked, if required, to prevent overloading.
First block valve for pressure instruments shall be included in the test.
If valves, where the cavity pressure may differ from the bore pressure, are included in the pressure test,
the following applies: valves shall be pressure tested in the half open position. All other valves shall be
tested in the fully open position. When check valves are included in pressure test they shall be pressure
tested from both side simultaneously to avoid differential pressure, jacked open or have their internals
removed.
Where the test pressure to be applied to the piping is greater than the maximum allowable test pressure
for valves, the valves shall be blinded off on the side to be tested, or removed and replaced by dummy
spools.
Turbines, pumps, compressors and vessels shall be blinded off prior to pressure testing.
A list shall be prepared for sensitive equipment (i.e. expansion joints, relief valves, inline instruments,
etc.) that shall be removed, blocked off or isolated during testing. This list shall be a part of the test
procedure.
9.3 Test media
For hydrostatic testing the test medium shall in general be fresh water, except that other suitable liquid
may be used if the piping or inline equipment would be adversely affected by water. If the liquid is
flammable, it's flash point shall be at least 49 °C and consideration shall be given to the environment.
The flushing medium shall be fresh water. The chloride ion content shall be less than 50 x 10"6 mg/L
(50 ppm), the pH value shall be between 6,5 and 9,5.
The line shall be properly drained as soon as possible after testing.
The test water shall have adequate antifreeze added if so required to prevent freezing until dried system.
Carbon steel systems as defined in Table B.1 shall be tested with an acceptable preservation fluid to
prevent corrosion. If test water pH value is 9 - 9,5 and temperature is below 30 °C, preservation fluid is
not required.
For pneumatic testing, the test media shall be oil free, dry air or any inert gas. The use of air for testing
shall be limited to a maximum pressure of 0,7 MPa overpressure. Above this pressure inert gas shall be
used. The extent of pneumatic testing shall be approved.
All safety aspects using compressible test media shall be evaluated.
For instrument/utility air systems, where the introduction of water is undesirable, test media shall be oil
free dry air or any inert gas.
9.4 Hydrostatic testing
The pressure shall gradually be increased to 90 % of the specified test pressure and kept for minimum 10
min to equalize strain. The pressure shall then be increased to specified test pressure.
The specified test pressure shall be kept for a minimum of 30 minutes after stabilization.
Prior to visual examination of all surfaces, welds and connections, the test pressure shall be reduced as a
safety precaution. Recommended pressure is 80 - 90% of test pressure.
Care shall be taken to ensure that over-pressuring due to static head does not take place.
The piping systems shall not show any sign of plastic deformation or leakage.
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9.5 Pneumatic testing
The sequence of test pressuring installed systems shall be as follows:
1 ) A pressure of 0,05 MPa overpressure shall be introduced in the system and a leak test
performed. The pressure shall gradually be increased to 50 % of the specified test pressure and
kept for minimum 10 min to equalize strain.
2) The pressure shall then be increased in steps of 10 % of the specified test pressure, until the
specified test pressure is reached. At each step, the pressure shall be kept for minimum 10 min to
equalize strain.
3) The specified test pressure shall be kept for a minimum of 30 minutes after stabilization. The
pressure shall than be reduced to the design pressure before examining for leakage.
4) The piping systems shall not show any sign of plastic deformation or leakage.
9.6 After completion of test
The tested systems shall be depressurised by opening the depressurising valve in the test rig. After
depressurisation, all vents and low point drain valves shall be opened and the system shall be thoroughly
drained where the test medium is water. Where required, blowing by dry air or pressurised air shock
blowing to remove any trapped water shall be performed to remove any residual or trapped water.
Systems with drying requirement as defined in Table B.1 shall be dried out after hydro testing with dry
and oil free air with a dew point of not higher than -1 0 °C. Drying can be terminated when the dew point at
the outlet is equal to the dew point at the inlet.
Other methods (e.g. vacuum drying or air shocking) may also be used if the same dryness can be
documented.
Requirement for drying as defined in Table B.1 shall take in to consideration the time for start up of
system. If more than three months to commissioning, drying shall be followed by preservation with
nitrogen to keep the pipe system completely dry and to avoid condense. Other alternatives are subject to
agreement.
Where permanent or temporary strainers have remained in place for the hydrostatic pressure test, they
shall be removed following the test and thoroughly cleaned before reinstalling.
Ends of pipes and nozzles shall be fully protected against the ingress of foreign material by the use of
caps, plugs or plate blinds sealed with gaskets. These shall not be removed until just prior to final
assembly.
Flange parallelity and alignment to equipment shall be checked prior to reinstatement.
All lines or joints that fail to pass the pressure test shall be re-tested to the same procedure after repairs.
9.7 Test documentation
For all pressure tests, documentation shall be fully traceable during the commissioning period of the
tested pipe. The documentation shall include, but not be limited to
• a valid test certificate specifying date, location, line numbers, test pressure, test medium and test
duration;
•
a test record chart fully specifying the pressure, temperature and time relation during the test period.
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10 Chemical cleaning
10.1 General
Lines to be chemical cleaned shall be identified. Cleaning shall be carried out after pressure testing
unless otherwise specified. For system overview, see Table B.1. Acceptance criteria for chemical
cleaning shall be according to ISO 4406.
As a minimum the following piping systems shall be chemically cleaned:
• lubrication oil;
• seal oil/gas or other seal fluids;
• fuel oil/gas (critical parts only);
• relevant part of gas compressor suction lines;
• process discharge to anti-surge control and safety relief valves;
• hydraulic oil systems with requirement to cleanness.
A procedure shall describe in detail the steps for chemical cleaning and shall include, but not be limited to
• degreasing;
• chemical cleaning/descaling;
• passivation.
Neutralization, water flushing and drying must be included in procedure if chemicals used so requires
avoiding material degradation.
The end result shall be a clean smooth surface. Maximum temperatures used during these operations
shall not exceed maximum design temperature for the systems.
For equipment such as turbines, generators, pumps and compressors, the piping to be cleaned shall
have all sensitive items that can be damaged by the cleaning medium removed or blanked off. Generally,
the following items shall not be chemically cleaned (items shall be identified on isometric drawings for
chemical cleaning):
• all instrument tubing downstream the first piping block valve;
• piping systems with copper alloy materials;
• flexible hoses;
• vessels;
• exchangers;
• pumps;
• all bolted/screwed valves and instruments.
Removed or blanked off items shall be cleaned separately.
The systems to be cleaned shall have high and low point vents and drains installed. "Dead legs" shall be
avoided.
In order to avoid flash corrosion, system temperatures shall be reduced before draining and opening to
atmospheric condition, i.e. at 30 °C with pH 9,4 carbon steel is neutral.
If more than three months to start up of commissioning activities the system shall be preserved with inert
gas. Overpressure shall be 0,05 MPa.
10.2 Documentation
The compliance to specified ISO 4406 requirements shall be documented by relevant laboratory analysis
certificate. The level of cleanness shall be documented from an automatic particle counter or a membrane
checked in a microscope, before the water flushing operation is considered finalised.
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11 Hot oil flushing
11.1 General
All piping subject to hot oil flushing, shall in advance be chemically cleaned to the required cleanness
level. Required cleanness for systems subject to hot oil flushing shall be in accordance with Table B.1.
Acceptance criteria for hot oil flushing shall be the same as for chemical cleaning of the similar systems.
A detailed procedure for hot oil flushing shall be written and approved by Company prior to start.
Filters used for hot oil flushing shall be
• < 3 pm ABS for hydraulic systems;
• < 10 pm ABS for lube and seal oil.
Filling of lubricant oil shall take place through filters with 10 pm ABS.
Flushing and sampling to verify cleanness shall take place at turbulent flow, upstream any filters. The fluid
samples shall be representative of the system with two to three test points.
To assure turbulent flow and proper transportation of particles, a minimum Reynold number of 4000 is
required during flushing.
„
pVD
VD
—-—
i9
Re = -
(1)
where
Re
is Reynolds number
V
is velocity of flow (m/s)
D
is diameter of pipe (m)
P
is density (kg/m3)
p
is dynamic viscosity (kg/ms)
i9
is kinematic viscosity (mz/s)
The oil used for flushing shall be equivalent to the oil used in operation. The oil viscosity shall be lower
than or equal to the viscosity of the oil used in operation.
Flushing oil shall, if possible, remain in the system after completion of flushing. Preservation shall be
performed, either by inert gas overpressure, chemical additive or other suitable method.
The level of cleanness shall be documented from an automatic particle counter or a membrane checked
in a microscope before a flushing operation is considered finalised.
A flowmeter shall be installed to verify flow used during flushing operation.
The maximum allowable water content in the oil used for flushing shall be below the oils maximum water
absorption capacity. This is to prevent precipitation of water droplets and potential water contamination of
the system.
NOTE: Typically, less than 300 ppm, but both higher and lower values will be acceptable based on the individual
oil water absorption capacity.
11.2 Marking
Piping spools or systems that have been chemical cleaned or hot oil flushed shall be marked in a unique
manner.
11.3 Documentation
The compliance to specified ISO 4406 requirements shall be documented by relevant laboratory analysis
certificates or other acceptable methods.
Hot oil flushing documentation shall be fully traceable during the project period of the flushed system. The
documentation shall include:
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• a certificate specifying level of cleanness according to ISO 4406, date, location, line numbers and
•
flushing medium,
a chart from automatic particle counter or the membrane for microscope used to verify particle
cleanness.
12 Tightness testing
A tightness test (leak test) can be performed to check that all external (e.g. mechanical joints, stuffing
box) and internal (closed valves) potential leakage points meet the maximum leakage requirements. The
tightness test is performed in the commissioning phase, after all construction work is finished and
mechanical completion is achieved.
If a leak test is requested, the test shall be performed with a suitable test medium. The test medium can
be divided into the following four types:
• Type 1 medium: toHe (1 % He);
• Type 2 medium: N2;
• Type 3 medium: Low pressure Air (maximum 0.7 MPa);
• Type 4 medium: Medium with equal or lower viscosity than actual service medium.
The different test medium shall be used in connection with the following services:
• Type 1 medium: All services containing toxic or flammable gases or volatile liquids, including first
valve connecting utility systems. Both external and internal leakage points to be checked;
• Type 2 medium: Utility systems containing gas where O2 present in the system is not acceptable.
•
•
Only external leakage points to be checked;
Type 3 medium: Utility systems containing gas where O2 present in the system is acceptable. Only
external leakage points to be checked;
Type 4 medium: All other services not falling into category type 1 , 2 or 3 medium. Only external
leakage points to be checked.
The pressure to be used in the test shall be the maximum operating pressure unless otherwise specified.
NOTE: Exposing the test segment to operational pressure is a vital element to secure that the segment will be
leak free during normal operation.
The pressure shall be maintained for a sufficient length of time to permit visual and/or electronically
examination of all external/internal potential leakage points.
The maximum allowed leakage rates should be as follows:
• Type 1 medium: 1 Sm3/year (~35 Sft3/year/ 2 bubbles/hr) for mechanical joints and 5 Sm3/year (~177
Sft3/year) for stuffing boxes. Helium detection equipment shall be used for identification of leakages;
• Type 2 medium: No visible or audible leakages. Soap water can be used for identification of
•
•
leakages;
Type 3 medium: No visible or audible leakages. Soap water can be used for identification of
leakages;
Type 4 medium: No visible leakages.
The leak test shall be performed according to accepted procedures and the test results shall be
documented.
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13 System colour coding of piping
13.1 Purpose
In addition to line-numbering, the purpose of having a system for colour coding of piping is to ensure
quick recognition of medium and flow direction for any system.
13.2 Types of markers
13.2.1 General
One of the markers described in 13.2.2 to 13.2.4 shall be used.
13.2.2 Adhesive band/plastic tape glued to the pipe surface
Shall be used:
• inside living quarters/ administration/ service buildings (HVAC-controlled areas).
Shall not be used:
• inside buildings provided with deluge systems or where water flushing will take place;
• on stainless and high-alloyed material and on pipes with a surface temperature of more than 60 °C.
13.2.3 Laminated plastic signs
Shall be used:
• on all painted carbon steel piping and on insulated piping:
Shall not be used:
• on piping in areas where there is a high probability for accumulation of dirt/mud e.g. wellhead area
due to drilling activity;
• on stainless and high-alloyed material and on pipes with a surface temperature of more than 60 °C;
• on small line sizes with OD 3 in. NPS and below and tubing 25 mm OD and below.
13.2.4 Laminated plastic signs, mounted in aluminium or stainless steel frame brackets
Shall be used:
• on all pipes of stainless and high-alloyed materials;
• on all pipes with a surface operating temperature of more than 60 °C;
• on all pipes of OD 3 in. NPS and below and all tubing of OD 25 mm and below.
Can be used on all pipes and in all areas mentioned in 13.2.2 and 13.2.3.
13.3 Insulated lines
Insulated lines with hidden electrical tracing shall have additional marking band.
13.4 Plastic/rubber lined piping
In addition to the markings described in 13.2.2 to 13.2.4, each spool of all plastic or rubber lined piping
shall be marked with the warning "Ikke sveis, innvendig belagt/Do not weld, inner lining". The warning
shall be with red letters on a white background.
13.5 Obstruction
The warning tape shall be yellow with black diagonal stripes. This tape is used in conjunction with a
standard marker to indicate special precaution requirements.
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13.6 Materials of markers
13.6.1 Adhesive tape/band
The adhesive tape/band shall be manufactured from PVC or polypropylene film on which the colour is
printed on the reverse (adhesive) side or front side printed with laminate.
The pigmentation shall secure colour retention when exposed to sunshine, oil, grease, steam wash etc.
Material shall be suitable for a marine atmosphere and for application in sheltered or exposed positions.
The adhesive used shall secure the tape firmly to pure metal surface or to surfaces coated or insulated in
accordance with project specifications. Tape shall have an adhesive free from chlorides.
13.6.2 Laminated plastic signs
Laminated plastic signs shall be manufactured of minimum two separate units. One layer where the
colours and the text are printed and one transparency layer to protect colours and text.
The tag shall be manufactured to cover both right and left flow directions, with right direction on one side
and left direction on the opposite side to give full flexibility to installation.
The pigmentation shall secure colour retention when exposed to sunshine, oil, grease and steam wash,
etc. The material shall be suitable for a marine atmosphere and for application in sheltered or exposed
positions.
The laminated tag shall be soft/elastic down to -5 °C. Bending tests shall be documented. Minimum
bending radius is 10 to 12 times the thickness of the tag (minimum thickness is 1,5 mm).
Laminated PVC-signs to be mounted in brackets made from stainless steel or seawater-proof aluminium.
13.7 Fastening materials
The tape/marker adhesive used shall secure the tape firmly to pure metal surface or to surfaces coated or
insulated in accordance with project specifications. The adhesive shall be free from chlorides.
The signs shall be fastened to the bare pipe or over insulated pipe by means of non-metallic, UV-resistant
PVC-straps and locks. Strap shall be proportionate to the size of the sign.
The brackets shall be fastened to the pipes with PVC-covered stainless steel straps and locks. Such
straps shall also be used for fastening of signs on all pipes with surface temperature of more than 60 °C
13.8 Marker text
Each marker text shall contain the following information:
• Line 1 - Name of flowing medium;
• Line 2 - Line number consisting of outside dimension, product code, system number, line sequence
•
number and pipe classification code;
Line 3 - Short description of function/service (optional)
The text shall be in letters and figures of minimum height of 5 mm according to Table 1, but size may be
adjusted to fit all required information within the arrow.
Longer words can be abbreviated using standard approved abbreviations. However, maximum two lines
can be used for the abbreviation. On laminated plastic signs, the size of the letters is to be adjusted to fit
the size of the sign.
The marking shall be with Norwegian text only. Exception is potable water, which shall have both
Norwegian and English text, thus: "Drikkevann/Potable water’1.
13.9 Size and use of markers
Tape markers can be used for all dimension pipes OD 12 in. NPS not recommended) provided it is cut
long enough to ensure minimum 10 % overlap on the pipes reverse side.
Laminated PVC signs shall be as given in Table 1.
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Table 1 - Size of coloured area on markers
Pipe size
Inch
U p to 1 3/4
2 to 3
4 to 8
10 to 16
18 and above
(Size no. 0)
(Size no. 1)
(Size no. 2)
(Size no. 3)
(Size no. 4)
Coloured area size
mm x mm
35 x 11 0
70 x 11 0
100 x 155
1 70 x 305
260 x 440
Text height
mm
5 to 7
5 to 7
6 to 8
8 to 10
10 to 17
The outside diameter of the cladding shall be the basis for determination of the size for insulated lines.
13.10 Positioning of markers
Markers shall be installed with the arrow pointing in the direction of flow. The following special application
rules shall be followed:
• markers shall be positioned specially considering operational aspects of the plant, and shall be easily
readable from deck, platform or ordinary access way. Ladders, scaffolding or other temporary
equipment shall not be needed for identification of markers;
markers shall be placed at each branching point;
•
• markers shall be placed on each side of bulkheads, decks and other penetration points;
• markers shall be positioned on the pipe close to major components of the actual system (vessel,
pumps, etc.);
maximum spacing between markers shall not exceed 10 m;
•
• marker shall be positioned by inlet and outlet of process train;
• on elevated pipes, markers shall be positioned adjacent to stairways and platforms;
markers shall be positioned at start and end of pipe racks.
13.11 Valve marking
Each valve (spade, spacer, spectacle blind, inline item and removable special items) shall carry a
minimum of one identification tag plate (number plate) in addition to makers tag.
The number plate shall be of stainless steel on which the tag number shall be permanently printed.
Minimum plate size shall be 20 mm x 50 mm with capital letters of height minimum 5 mm. The tags shall
be fastened close to the valve, not onto the valve. This is to ensure the tag is in position even if the valve
is removed or dismantled.
13.12 Fluid description/colour code tabulation
Colour coding shall be in accordance with NS 813 and NS 4054. A detailed coding for systems within oil
and gas production is given in NORSOK Z-DP-002.
13.13 Colour coding information
The platform shall have a complete easy readable chart of the used colour coding. The chart shall be
mounted, easy to read, at strategic locations in the applicable area.
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Annex A
(normative)
Alternative test methods
A.1
Scope
This annex defines the alternative test options and methods that may be applied to replace the pressure
test requirement for closure welds in hook up spools, and for minor changes and addition in piping system
which have already been hydrostatically tested.
A.2
General
All installed piping shall have been pressure tested at the test conditions and medium as specified in
accordance with the requirements laid down in ASME B31.3 and this NORSOK standard.
All integral welds in a hook-up spool shall have been previously pressure tested. Prior to any alternative
testing taking place, acceptance shall be obtained from Company.
The acceptance request should contain:
• technical/safety reason for deviation;
• statement explaining why an alternative test is considered as an acceptable method;
• reference to line no., mechanical completion pipe test no. and weld nos., and other relevant system
references;
• marked up P&ID;
• marked up fabrication isometric drawing;
• pipe stress summary of all welds (for lines subject for comprehensive stress analysis);
• procedure for internal cleaning of pipe after completed fabrication (when relevant);
• alternative test to be performed shall be stated, see clause A.3;
• confirmation of allowable stress, in according to stress analysis, does not exceed 70 % of yield.
A.3
Alternative testing method
A .3.1 General
In all cases where pressure testing of hook-up spools welds and any minor changes or additions to the
piping system will entail an extensive retest, the closure/minor welds may be alternatively tested to the
stipulations of this NORSOK standard without being subjected to any pressure test requirements.
The qualification of a weld by alternative testing falls into the following two categories, which are
determined by service/pressure.
A.3.2 Alternative I, Category D fluid service (as defined in ASME B31.3)
100 % NDE shall be performed and minimum two different NDE methods shall be employed
(i.e. 2x100 % NDE). The feasibility of the NDE methods shall be evaluated and concluded based on
material, wall thickness, geometry and access. In cases where the required NDE methods can only be
used with limitations, the limitations shall be identified and considered by International Welding Engineer
(IWE). Additional control steps during welding operations shall be evaluated.
A certified welding-inspector shall follow up the welding during the entire welding operation.
A.3.3 Alternative II, Normal fluid service (as defined in ASME B31.3)
The final weld (closure weld) which connects the systems is not required to be pressure tested provided
the following requirements have been met:
The weld is examined in accordance with ASME B31.3 and passes with
• 100 % visual inspection;
• 100 % radiographic inspection;
• 100 % ultrasonic examination;
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• 100 % MPI or dye penetrant as applicable to material.
A certified welding inspector shall follow up the welding during the entire welding operation.
All alternative testing shall be documented with full traceability to the applicable welds.
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Annex B
(informative)
Requirements for internal treatment of piping after prefabrication and
installation before commissioning
Table B.1 represents typical minimum treatment requirements.
Table B.1 — Requirements for internal treatment of piping after prefabrication and installation
before commissioning
Serv
-ice
Flush
Required
cleanliness
Treatment
code
System/Service
Description
Prior
Hot
oil
Pressure
Flush
test
Chemical
Cleaning
Air
Shock
ISO 4406
(PAS)
Cleaning
Verification
Method
Drying
Video
Inspection
Comments
Section reference
8
Al
AP
BA
i
Air instrument
Air plant
Bulk additives
powder (Note 2)
Bulk Barite
BB
(Note 2)
Bulk cement
BC
Bulk bentonite
BD
(Note 2)
Cement, liquid
BL
additive
Cement, high/low
BM
pressure (Note 2)
Chemical,
CA
_methanol (Note 2)
Chemical, biocide
CB
Chemical, catalyst
CC
Chemical, scale
CD
inhibitor
Chemical,
CE
demulsifier or
defoamer
Chemical, surface
CF
active fluid
Chemical, glycol
CG
Chemical, AFFF
CH
Chemical, pH
CJ
con trailer
Chemical,
CK
corrosion inhibitor
Chemical, mud
CN
11
10
AIR
AIR
AIR
8, 9.7 _
X
X
X
8,9.7
SC
SC
SC
9.6
X
X
X
AIR
X
SC
X
AIR
AIR
X
X
SC
SC
X
X
Water
SC
X
Water
SC
Water
SC
Water
Water
Water
SC
SC
SC
X
14/10
Water
Water
SC
X
SC
Water
Water
Water
X
SC
SC
SC
Water
X
14/10
SC
Water
SC
Water
SC
Water
SC
Water
SC
Water
SC
Water
SC
additive
CO
CP
CR
CS
Chemical, oxygen
scavenger
Chemical,
polyelectrolyte /
flocculants
Chemical,
refrigerant
(Note 2)
Chemical, sodium
hypochlorite
solution
CV
Chemical, wax
inhibitor
28
CW
Chemical,
Water
SC
DC
DM
glycol/water (rich
glycol to regen.)
Drain, closed
Drain, mud
Water
Water
SC
SC
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Serv
-ice
code
Flush
Prior
Hot
oil
Pressure
Flush
test
System/Service
Description
Drain, open
(Note 4)
Drain,
DS
_sewer/sanitary
Drain, water/storm
DW
Completion fluid
FC
_high/low pressure
Fuel, jet
FJ
Gas, fire
GA
_ fightinq/CO;
Gas, fuel
GF
Gas, inert
Gl
Gas, waste/flue
GW
Mud, bulk/solid
MB
Mud, high
MH
pressure
Mud, kill
MK
Mud, low pressure
ML
Oil, Crude (Note 2)
PC
Oil, fuel (diesel oil)
OF
DO
Oil, hydraulic
Oil, Hot system
(Note 2)
Oil, lubricating
Oil, seal
OH
OM
OL
OS
PB
Treatment
Process blow
8
Water
11
Chem ical
Cleaning
10
Air
Shock
Required
cleanliness
Cleaning
Verification
Method
ISO 4406
Video
Inspection
(PAS)
Section reference
8, 9.7 _
8, 9.7
SC
Water
SC
Water
Water
SC
SC
Water
N-/CO-
X
Water
N;
Water
Water
Water
X
X
X
14/10
SC
SC
SC
SC
SC
X
X
X
X
SC
SC
SC
SC
X
Water
Water
X
X
X
X
14/10
SC
SC
X
X
Water
Water
Water
X
X
X
X
X
14/10
14/10
SC
SC
SC
X
X
Process
hydrocarbons
Water
X
SC
Process two
phase
Water
X
SC
Process
hydrocarbons
_ vapour
Produced water
PW
Steam, process
SP
Steam, utility/piant
SU
Vent, atmospheric
VA
Water
X
SC
_liquid_
PT
PV
i
_
Water
Water
Water
Water
SC
SC
SC
SC
Water
Water
SC
SC
Water
SC
Water
SC
Water
SC
Water
SC
_
VF
WA
_
WB
WC
(Note 4)
Vent, flare
Water, sea antiliquefaction
Water, sea
ballast/grout
Water, fresh/glycol
- cooling medium
WD
WF
WG
WH
Wl
WJ
WO
Water, fresh
potable
Water, sea fire
Chemical
cleaning of
critical parts only
Chemical
cleaning of
critical parts only
Chemical
cleaning of
critical parts only
Chemical
cleaning of
critical parts only
Chemical
cleaning of
critical parts only
_
fighting_
Water, grouting
Water
systems _
Water, fresh/glycol
Water
- heating medium _
Water, sea
Water
injection
Water, jet
Water
Water, oily
Water
(Note 2)
NORSOK ©2016
9.6
SC
SC
down
PL
Comments
14/10
X
Water
Water
Water
Water
Drying
SC
SC
SC
SC
SC
29
NORSOK L-004:2016
Serv
-ice
Flush
Required
cleanliness
Treatment
code
System /Service
Description
WP
WQ
WS
WT
NOTE 1
NOTE 2
NOTE 3
NOTE 4
30
Water, fresh raw
(produced water)
Water, fresh hot
(closed circuit)
Water, sea
Base oil
Prior
Hot
oil
Pressure
Flush
test
8
Water
11
Chemical
Cleaning
10
Air
Shock
ISO 4406
(PAS)
Section reference
8,9.7 _
Cleaning
Verification
Method
Drying
Video
Inspection
8, 9.7
SC
Water
SC
Water
Water
SC
SC
Comments
9.6
Preservation according to NORSOK Z-006.
Service codes is according to NORSOK Z-006, except for noted service codes which are additions/changes
SC - Inspection by spot check.
No pressure test required, see 9.1
NORSOK ©2016
!
:
standard
norge