IGS-M-RS-401(1)
July 2014
Approved
IGS
10 000
!"
- . /$
/$
% &'(
)* + ,
. 012
Specification for Measuring/ Reducing and Measuring
Cabinet Type Stations with Max. Capacity up to 10,000
SCM/H
.
Fax:(9821)-8131-5679
3345 67894: ;<3=9>?;@A9 BC;A=3 D>E4F@G: 6HI? JC4KL 6M NOP ;<3=9>?;@A9Q9 D3;R@A9 S94M
http://igs.nigc.ir
igs@nigc.ir
N.I.G.C.
July 2014
IGS-M-RS-401(1)
FOREWORD
This standard is intended to be mainly used by NIGC and contractors, and
has been prepared based on interpretation of recognized standards,
technical documents, knowledge, backgrounds and experiences in natural
gas industry at national and international levels.
Iranian Gas Standards (IGS) are prepared, reviewed and amended by
technical standard committees within NIGC Standardization division and
submitted to the NIGC's "STANDARDS COUNCIL" for approval.
IGS Standards are subject to revision, amendment or withdrawal, if
required. Thus the latest edition of IGS shall be checked/inquired by NIGC
employees and contractors.
This standard must not be modified or altered by NIGC employees or its
contractors. Any deviation from normative references and / or well-known
manufacturer’s specifications must be reported to Standardization division.
The technical standard committee welcomes comments and feedbacks
about this standard, and may revise this document accordingly based on
the received feedbacks.
GENERAL DEFINITIONS:
Throughout this standard the following definitions, where applicable, should
be followed:
1- "STANDARDIZATION DIV." is organized to deal with all aspects of
industry standards in NIGC. Therefore, all enquiries for clarification or
amendments are requested to be directed to mentioned division.
2- "COMPANY": refers to National Iranian Gas Company (NIGC).
3- "SUPPLIER": refers to a firm who will supply the service, equipment or
material to NIGC whether as the prime producer or manufacturer or a
trading firm.
4- "SHALL ": is used where a provision is mandatory.
5- "SHOULD": is used where a provision is advised only.
6- "MAY": is used where a provision is completely discretionary.
------------------------------------Website: http://igs.nigc.ir
E-mail: igs@nigc.ir
I
‫‪July 2014‬‬
‫)‪IGS-M-RS-401(1‬‬
‫‪N.I.G.C.‬‬
‫اﻣﻮر ﺗﺪوﻳﻦ اﺳﺘﺎﻧﺪاردﻫﺎ‬
‫ﭘﻴﺸﮕﻔﺘﺎر‬
‫‪ -1‬اﻳﻦ اﺳﺘﺎﻧﺪارد‪ /‬دﺳﺘﻮراﻟﻌﻤﻞ ﺑﻪ ﻣﻨﻈﻮر اﺳﺘﻔﺎده ﺧﺼﻮﺻﻲ در ﺷﺮﻛﺖ ﻣﻠﻲ ﮔﺎز اﻳﺮان و ﺷﺮﻛﺘﻬﺎي ﻓﺮﻋﻲ واﺑﺴﺘﻪ ﺗﻬﻴﻪ ﺷﺪه اﺳﺖ ‪.‬‬
‫‪ -2‬ﺷﺮﻛﺖ ﻣﻠﻲ ﮔﺎز اﻳﺮان در ﻣﻮرد ﻧﻴﺎزﻫﺎي ﻋﻤﻮﻣﻲ از اﺳﺘﺎﻧﺪاردﻫﺎي وزارت ﻧﻔﺖ )‪ (IPS‬و در ﻣﻮرد ﻧﻴﺎزﻫﺎي اﺧﺘﺼﺎﺻﻲ از اﺳﺘﺎﻧﺪاردﻫﺎي‬
‫اﺧﺘﺼﺎﺻﻲ ﺧﻮد )‪ (IGS‬اﺳﺘﻔﺎده ﻣﻲ ﻧﻤﺎﻳﺪ‪.‬‬
‫‪ -3‬اﺳــــﺘﺎﻧﺪاردﻫﺎي ﺷــــﺮﻛﺖ ﻣﻠــــﻲ ﮔــــﺎزاﻳﺮان )‪ (IGS‬ﺗﻮﺳــــﻂ ﻛﻤﻴﺘــــﻪﻫــــﺎي ﺗﺨﺼﺼــــﻲ اﺳــــﺘﺎﻧﺪارد ﻣﺘﺸــــﻜﻞ از ﻛﺎرﺷﻨﺎﺳــــﺎن‬
‫ﺑﺨﺶ ﻫﺎي ﻣﺨﺘﻠﻒ و ﻳﺎ ﻣﺸﺎور ﺗﻬﻴﻪ ﻣﻲ ﺷﻮد و ﺗﻮﺳﻂ ﺷﻮراي اﺳﺘﺎﻧﺪارد ) ﻣﻨﺘﺨﺐ ﻫﻴﺌﺖ ﻣﺪﻳﺮه ﺷﺮﻛﺖ ﻣﻠﻲ ﮔـﺎز اﻳـﺮان ( ﺑـﻪ ﺗﺼـﻮﻳﺐ‬
‫ﻣﻲ رﺳﻨﺪ‪.‬‬
‫‪ -4‬در ﺗﻨﻈﻴﻢ ﻣﺘﻦ اﺳﺘﺎﻧﺪاردﻫﺎي )‪ (IGS‬از ﻛﻠﻴﻪ ﻣﻨﺎﺑﻊ ﺷﻨﺎﺧﺘﻪ ﺷﺪه اﺳﺘﺎﻧﺪاردي ‪ ،‬اﻃﻼﻋﺎت ﻓﻨﻲ – ﺗﺨﺼﺼﻲ ﻣﺮﺑﻮط ﺑـﻪ ﺻـﻨﺎﻳﻊ ﮔـﺎز دﻧﻴـﺎ‪،‬‬
‫ﻣﺸﺨﺼﺎت ﻓﻨﻲ ﺗﻮﻟﻴﺪات ﺳﺎزﻧﺪﮔﺎن ﻣﻌﺘﺒﺮ ﺟﻬﺎﻧﻲ و ﻧﻴﺰ از ﻧﺘﻴﺠﻪ ﺗﺤﻘﻴﻘﺎت و ﺗﺠﺮﺑﻴﺎت ﻛﺎرﺷﻨﺎﺳﺎن و ﻣﺘﺨﺼﺼﺎن داﺧﻠﻲ ﺑﺮﺣﺴﺐ ﻣـﻮرد‬
‫اﺳﺘﻔﺎده ﻣﻲ ﺷﻮد‪ .‬ﻫﻤﭽﻨﻴﻦ ﺑﻪ ﻣﻨﻈﻮر اﺳﺘﻔﺎده ازﻫﺮ ﭼﻪ ﺑﻴﺸﺘﺮ از ﺗﻮﻟﻴﺪات داﺧﻠﻲ ﻗﺎﺑﻠﻴﺖ ﻫﺎي ﺳﺎزﻧﺪﮔﺎن داﺧﻠﻲ ﻧﻴﺰ ﻣـﻮرد ﺗﻮﺟـﻪ ﻗـﺮار‬
‫ﻣﻲ ﮔﻴﺮد‪.‬‬
‫‪ -5‬اﺳـــﺘﺎﻧﺪاردﻫﺎ از ﻃﺮﻳـــﻖ ﭘﺎﻳﮕـــﺎه اﻳﻨﺘﺮﻧﺘـــﻲ ﺷـــﺮﻛﺖ * و ﻳـــﺎ ﻟـــﻮح ﻓﺸـــﺮده )‪ (CD‬در اﺧﺘﻴـــﺎر واﺣـــﺪﻫﺎ و ﻛـــﺎرﺑﺮان ﻗـــﺮار‬
‫ﻣﻲ ﮔﻴﺮد‪.‬‬
‫‪ -6‬اﺳﺘﺎﻧﺪاردﻫﺎ ﺑﻪ ﻃﻮر ﻣﺘﻮﺳﻂ ﻫﺮ ‪ 5‬ﺳﺎل ﻳﻜﺒﺎر و ﻳﺎ در ﺻﻮرت ﺿﺮورت زودﺗﺮ ‪ ،‬ﻣﻮرد ﺑﺎزﻧﮕﺮي و ﺑﺮوز رﺳﺎﻧﻲ ﻗﺮار ﻣﻴﮕﻴﺮﻧـﺪ‪ .‬ﺑﻨـﺎﺑﺮاﻳﻦ‬
‫ﻛﺎرﺑﺮان ﺑﺎﻳﺪ ﻫﻤﻴﺸﻪ آﺧﺮﻳﻦ ﻧﮕﺎرش را ﻣﻮرد اﺳﺘﻔﺎده ﻗﺮار دﻫﻨﺪ‪.‬‬
‫‪ -7‬ﻫﺮ ﮔﻮﻧﻪ ﻧﻈﺮ و ﻳﺎ ﭘﻴﺸﻨﻬﺎد اﺻﻼح در ﻣﻮرد اﺳﺘﺎﻧﺪاردﻫﺎ ﻣﻮرد اﺳﺘﻘﺒﺎل و ﺑﺮرﺳﻲ ﻗﺮار ﺧﻮاﻫـﺪ ﮔﺮﻓـﺖ و در ﺻـﻮرت ﺗﺎﺋﻴـﺪ ‪ ،‬اﺳـﺘﺎﻧﺪارد‬
‫ﻣﺮوﺑﻮﻃﻪ ﻧﻴﺰ ﻣﻮرد ﺗﺠﺪﻳﺪ ﻧﻈﺮ ﻗﺮار ﺧﻮاﻫﺪ ﮔﺮﻓﺖ‪.‬‬
‫ﺗﻌﺎرﻳﻒ ﻋﻤﻮﻣﻲ‬
‫در ﻣﺘﻦ اﺳﺘﺎﻧﺪاردﻫﺎي )‪ (IGS‬از ﺗﻌﺎرﻳﻒ و اﺻﻄﻼﺣﺎت زﻳﺮ اﺳﺘﻔﺎده ﻣﻲ ﺷﻮد ‪.‬‬
‫‪" -1‬ﺷﺮﻛﺖ" )‪ : (COMPANY‬ﻣﻨﻈﻮر از ﺷﺮﻛﺖ " ﺷﺮﻛﺖ ﻣﻠﻲ ﮔﺎز اﻳﺮان " و ﻳﺎ ﺷﺮﻛﺘﻬﺎي ﻓﺮﻋﻲ واﺑﺴﺘﻪ ﻣﻲ ﺑﺎﺷﺪ‪.‬‬
‫‪ " -2‬ﻓﺮوﺷﻨﺪه " )‪ : (PUPPLIER / VENDOR‬ﺑﻪ ﻓﺮد ﻳﺎ ﻣﻮﺳﺴﻪ اي اﻃﻼق ﻣﻲ ﮔﺮدد ﻛﻪ ﺗﻌﻬﺪي را ﻧﺴـﺒﺖ ﺑـﻪ ﺷـﺮﻛﺖ ﺗﻘﺒـﻞ ﻧﻤـﻮده‬
‫اﺳﺖ ‪.‬‬
‫‪ " -3‬ﺧﺮﻳـــﺪار" )‪ : (PURCHASER‬ﻣﻨﻈـــﻮر از ﺧﺮﻳـــﺪار " ﺷـــﺮﻛﺖ ﻣﻠـــﻲ ﮔـــﺎز اﻳـــﺮان" و ﻳـــﺎ ﺷـــﺮﻛﺘﻬﺎي ﻓﺮﻋـــﻲ واﺑﺴـــﺘﻪ‬
‫ﻣﻲ ﺑﺎﺷﺪ‪.‬‬
‫‪ : "SHALL" -4‬در ﻣﻮاردي ﺑﻜﺎرﺑﺮده ﻣﻲ ﺷﻮد ﻛﻪ اﻧﺠﺎم ﺧﻮاﺳﺘﻪ ﻣﻮرد ﻧﻈﺮ اﺟﺒﺎري اﺳﺖ‪.‬‬
‫‪ : "SHOULD" -5‬در ﻣﻮاردي ﺑﻜﺎرﺑﺮده ﻣﻲ ﺷﻮد ﻛﻪ اﻧﺠﺎم ﺧﻮاﺳﺘﻪ ﻣﻮرد ﻧﻈﺮ ﺗﺮﺟﻴﺤﻲ و در ﻋﻴﻦ ﺣﺎل اﺧﺘﻴﺎري اﺳﺖ ‪.‬‬
‫‪ : "MAY" -6‬در ﻣﻮاردي ﺑﻜﺎر ﺑﺮده ﻣﻲﺷﻮد ﻛﻪ اﻧﺠﺎم ﻛﺎر ﺑﻪ ﺷﻜﻞ ﻣﻮرد ﺑﺤﺚ ﻧﻴﺰ ﻗﺎﺑﻞ ﻗﺒﻮل ﻣﻲ ﺑﺎﺷﺪ‪.‬‬
‫)‪ ،(nigcigs@nigc.ir‬آدرس اﻟﻜﺘﺮوﻧﻴﻜﻲ)‪ *(http://igs.nigc.ir‬آدرس اﻳﻨﺘﺮﻧﺘﻲ‬
‫‪II‬‬
N.I.G.C.
July 2014
IGS-M-RS-401(1)
CONTENTS
PAGE
1. SCOPE
2
2. REFERENCES
2
3. DEFINITIONS
4
4. REQUIREMENTS
9
4.1 Design and Service Conditions
9
4.2 Materials
15
5. INSPECTION, TESTS AND CERTIFICATIONS
15
5.1 Prior to Fabrication
15
5.2 Inspection Documents
16
5.3 Tests
16
5.4 Inspection and Certificates
17
6. PAINTING
17
7. MARKING
18
8. PACKING AND PACKAGING
18
9. DOCUMENTATION
18
9.1 With Technical Quotation
18
9.2 After Receipt of Order
19
10.GUARANTEE
19
APPENDIXES
APPENDIX A – ‫ﻣﺼﻮﺑﻪ ﺷﻮراي ﻋﺎﻟﻲ ﻣﺤﻴﻂ زﻳﺴﺖ‬
21
APPENDIX B – Data Sheet
22
APPENDIX C – Typical Arrangement of Cabinet Type Station
37
1
N.I.G.C.
July 2014
IGS-M-RS-401(1)
1. SCOPE
This specification together with the Appendices there to covers the minimum requirements
for design, material, construction, testing, inspection, painting, marking, packing and
packaging of cabinet type stations to be used for measuring, pressure reducing and
measuring of natural gas (as per composition in (IGS-M-CH-033)) with inlet working
pressure of (10-17.2) bar (150-250) psig and maximum capacity of 10,000 scm/h.
For specific requirements see Appendix B (data sheet). In case of any exception to this
specification, it shall be clearly stated on the technical quotation submitted by supplier. In
this specification, cabinet type station will be referred as station.
2. REFERENCES
Throughout this standard specification the following standards, codes and reports are
referred to. The editions of these standards and codes that are in effect at the time of
publication of this standard specification shall, to the extent specified herein, form a part of
this standard specification. The applicability of changes in standards and codes that occur
after the date of this standard specification shall be mutually agreed upon by the
purchaser and supplier and/or manufacturer.
2.1 Normative References
ANSI/ASME B1.20.1 "Pipe Threads, General Purpose (inch)"
API 5L "Standard Specification for Line Pipe"
API RP 500 "Recommended Practice for Classification of Locations for Electrical
Installations at Petroleum Facilities Classified as Class I , Division 1 and Division 2 First
Edition"
API 1104 "Welding of Pipelines and Related Facilities"
ASTM A 53 "Standard Specification for Pipe, Steel, Block and Hot-Dipped, Zinc-Coated,
Welded and Seamless"
ASTM A 105/A 105M "Standard Specification for Carbon Steel Forgings for Piping
Applications"
ASTM A 106/A 106 M "Standard Specification for Seamless Carbon Steel Pipe for HighTemperature Service"
ASTM A 193 "Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials
for High-Temperature Service"
ASTM A 144 "Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High
Pressure or High Temperature Service, or both"
ASTM A 216/ A126 M "Standard Specification for Steel Casting, Carbon, Suitable for
Fusion Welding, for High Temperature Service"
2
N.I.G.C.
July 2014
IGS-M-RS-401(1)
ASTM A 283 "Standard Specification for Low and Intermediate Tensile Strength Carbon
Steel Plates"
ASTM A 403 "Standard Specification for Wrought Austenitic Stainless Steel Piping,
Fittings"
ASTM B 117 "Standard Practice for Operating Salt Spray (FOG) Apparatus"
ANSI B16.5 "Pipe Flanges and Flanged Fittings NPS l/2 Through NPS 24"
ANSI B31.8 "Gas Transmission and Distribution Piping Systems"
BS 381 C " Specification for Colures for Identification, Coding and Special Purposes"
BS 4368 "Metallic Tube Connectors for Fluid Power and General Use Split Collect
Compression Fittings"
BS 4800 "Paint Colures for Building Purpose"
BS EN 1776 "Gas Supply – Natural Gas Measuring Stations - Functional Requirements"
BS EN 12186 " Gas Supply Systems – Gas Pressure Regulating Stations for
Transmission and Distribution - Functional Requirements"
EN 837-1 "Pressure Gauges - Bourdon Tube, Pressure Gauge - Dimensions, Metrology,
Requirements and Testing"
IGS-M-CH-033(0) "Specification for pipeline quality natural gas"
IGS-CH-041(0) "Specification for Painting Procedure for Gas Pressure Reducing
Stations"
IGS-0-CH- 042 (2006) “Painting-procedure for Gas Industry Installation”
IGS-IN-302(0) "Specification for Relief Valves"
IGS-M-1N-102 "Specification for Turbine Meters"
IGS-M-IN-202(0) "Specification for Gas Pressure Regulators for Nominal Inlet Pressure.5
to 100 bar (72-1450 psig)"
IGS-M-PL-002-1(2) "Specification for Plug Valves Size 2" to 24" Part (1)"
IGS-M-PL-010-1(1) "Specification for Ball Valves Class Rating: 150 Part (1)"
IGS-PL-003(2) "Specification for Needle and Gauge Valves"
IGS-PL-005 (1) "Specification for Sensing Tube Lines"
3
N.I.G.C.
July 2014
IGS-M-RS-401(1)
IGS- PL-006(1) "Specification for Insulating Joints"
IGS-PL-005(1) "Specification for Gaskets"
IGS-PL-018(0) "Specification for Welding Consumables"
IGS-PL-022-1(0) "Specification for Butt Welding Ends, Carbon Steel Fitting Size: 1/2 in. to
12 in. Part (1)"
IGS-PM-105(0) "Specification for Dry Gas Filter"
ISO 9000 (2005) "Quality Management and Quality Assurance Standards Guidelines for
Selection and Use"
ASTM A 193 grade B7 (Bolts) and ASTM A194 grade2H (Nuts)
pr EN 50154 "Electrical Installations in Explosive Gas Atmospheres (other than Mines)”
EN 60079-10 “Electrical Apparatus for Explosive Gas Atmospheres - Part10 :
Classification of Hazardous Areas.(IEC 60079-10 :1995) "
IPS-G-GN-210 ”Packing and Packaging”
IGS-M-PM-111 "Dry Gas Filter Cartridge"
3. DEFINITIONS
For the purpose of this standard, the following definitions apply:
3.1 Measuring Station
An installation comprising all the equipment including the inlet and outlet pipework as far
as the isolating valves and any structure within which the equipment is housed, used for
gas measurement in custody transfer.
3.2 Pressure Reducing Station
The station consists of equipment installed for the purpose of automatically reducing and
regulating the pressure in the downstream pipeline or main to which it is connected.
Included are piping and auxiliary devices such as valves, control instruments, control
lines, the enclosure, and ventilation equipment.
3.3 Pressure Reducing and Measuring Station
The combination of a pressure reducing station and measuring station. It consists of
equipment installed for the purpose of automatically reducing and regulating the pressure
in the downstream pipeline or main to which it is connected and also measuring it.
3.4 Pressure
The gauge pressure of the fluid inside the system, measured in static conditions.
4
N.I.G.C.
July 2014
IGS-M-RS-401(1)
3.5 Design Pressure (DP)
Design pressure is the maximum pressure permitted by code, as determined by the
design procedures applicable to the material and locations involved.
3.6 Operating Pressure (OP)
The pressure which occurs within a system under normal operating conditions.
3.7 Maximum Operating Pressure (MOP)
The maximum pressure at which a system can be operated continuously under normal
operating conditions.
Note: Normal operating conditions are: no fault in any device or stream.
3.8 Maximum Incidental Pressure (MIP)
The maximum pressure which a system can experience during a short time, limited by the
safety devices.
3.9 Temporary Operating Pressure (TOP)
The pressure at which a system can be operated temporarily under control of regulating
devices.
3.10 Maximum Operating Temperature (Tmax )
The maximum temperature at which a system can be operated continuously under normal
conditions.
Note: Normal conditions are: no fault in any device or stream.
3.11 Minimum Operating Temperature (Tmin )
The minimum temperature at which a system can be operated.
3.12 Measuring System
Complete set of measuring instruments and other equipment assembled to carry out
specified measurements.
3.13 Measuring Instrument
Device intended to be used for measurements, alone or in conjunction with supplementary
device(s).
Measuring instruments are e.g. gas meter, pressure sensor, density sensor.
3.14 Instrumentation
Any system or combination of equipment for measurement and control.
3.15 Accuracy of Measurement
Closeness of the agreement between the result of a measurement and a true value of the
measurand.
3.16 Maximum Permissible Error (of a Measuring Instrument)
Extreme values of an error permitted by specifications, regulations, etc. for a given
measuring instrument.
5
N.I.G.C.
July 2014
IGS-M-RS-401(1)
3.17 Flow Computer
Flow calculating device which indicates the flowrate as integrated volume or mass or
energy base conditions.
3.18 Conversion Device
A device consisting of a flow computer and sensors used for converting the volume
(flowrate) at operating conditions into a volume (flowrate) at standard conditions or to
mass (flowrate) or to energy (flowrate) at base conditions, based on either pressure,
temperature and gas composition, or on density, or on calorific value.
3.19 Installation Effect
Any difference in performance of a measuring instrument or of the measuring system
between the calibration under reference and operating conditions.
3.20 Systematic Error
Mean that would result from an infinite number of measurements of the same measurand
carried out under repeatability conditions minus a true value of the measurand.
3.21 Fail - Safe
Characteristic of a device to go to a safe operating condition when a failure occurs.
3.22 Overpressure Protection
Overpressure protection is provided by a device or equipment installed for the purpose of
preventing the pressure in a pressure vessel, a pipeline, or a distribution system from
exceeding a predetermined value. This protection may be obtained by installing a
pressure relief device or a pressure shut off device.
3.23 Pressure Relief Device
A device which is installed to vent gas from a system being protected in order to prevent
the gas pressure from exceeding a predetermined limit by venting the gas into
atmosphere.
3.24 Ambient Temperature
Usually used to refer to the temperature of the air in which a structure or a device
operates.
3.25 Block Valve
A gate, plug or ball valve that prevents flow or leakage into the down stream conduit when
in the closed position. Valve shall be single or double seated, bidirectional or
unidirectional. Unidirectional valve shall be marked with a flow direction arrow.
3.26 Turbine Gas Meter
Measuring device in which the dynamic forces of the flowing gas cause a turbine wheel to
rotate with a speed as a function of the volume flowrate. The number or revolutions of the
turbine wheel is the basis for the indication of the volume passed through the meter.
3.27 Measured Quantity
Volume in cubic meters, at metering conditions.
6
N.I.G.C.
July 2014
IGS-M-RS-401(1)
3.28 Volume Flow Rate
Volume at metering conditions divided by time.
3.29 Rangeability
The ratio between Qmin and Qmax, i.e. the minimum and maximum flow rate respectively
for which the meter performs within the maximum permissible errors.
3.30 Metering Pressure (PM)
Absolute gas pressure to which the indicated volume of gas is related.
3.31 Metering Conditions
Conditions of the gas prevailing at the point of the measurement (e.g. temperature and
pressure of the measured gas in the meter).
3.32 DN- Designation
Numerical designation of size for components of a pipework system, which is used for
reference purposes.
It comprises the letters DN followed by a dimensionless whole number which is indirectly
related to the physical size, in millimeters, of the bore or outside diameter of the end
connections.
3.33 PN- Designation
Alphanumeric term used for reference purposes related to a combination of mechanical
and dimensional characteristics of a component of a pipework system with regard to
pressure. It comprises the letters PN followed a dimensionless whole number.
3.34 Gas Pressure Regulator
Device which maintains the outlet pressure constant independent of the variation in inlet
pressure and / or flow rate within defined limits.
3.35 Cabinet Station
An enclosed space (apart from any necessary ventilation apertures), which is used
exclusively to house gas pressure–regulating and/or metering equipment and ancillaries.
3.36 Enclosed Installation
Plant installed in an enclosed space (apart from any necessary ventilation aperture).
3.37 Open Air Installation
A plant installed in the open air, which may or not be protected by a canopy.
3.38 Hazardous Area
An area in which an explosive or flammable gas atmosphere is present, or may be
expected to be present, in quantities such as to require special precautions for the
construction, installation and use of apparatus.
3.39 Hazardous Area Zones
Hazardous areas are classified in zones based upon the frequency of the occurrence and
the duration of a flammable atmosphere.
7
N.I.G.C.
July 2014
IGS-M-RS-401(1)
3.40 Component
Any item from which a gas supply system or installation pipework is constructed. A
distinction is drawn between the following groups of components:
- Ancillaries (pressure regulators, valves, safety devices, expansion joints, insulating
Joints)
- Pipes (including bends made from pipe)
- Instrumentation pipework
- Fittings
3.41 Inlet Pipework
Connecting pipework through which gas enters the station.
3.42 Outlet Pipework
Connecting pipework through which gas leaves the station.
3.43 Standard Condition
The conditions to which a volume of gas is converted (i.e. base gas temperature 15.56 °C
(60°F) base pressure 1013.25 mbar absolute (14.696 psi) .
3.44 Strength Test
Specific procedure to verify that the pipework and /or station meets the requirements for
mechanical strength.
3.45 Tightness Test
specific procedure to verify that the pipework and / or station meets the requirements for
tightness.
3.46 Instrumentation Pipework
Pipework required for the proper functioning of the ancillaries installed within the pressure
regulating station. such as sensing, auxiliary and sampling lines.
3.47 Safety Shut - Off Device
Device designed to shut off the gasflow which responds slower dynamically than a slam
shut device in the event of an unacceptable pressure being detected within the system it
protects.
3.48 Safety Slam - Shut Device
Device designed to quickly shut off the gasflow in the event of an unacceptable pressure
being detected within the system it protects.
3.49 Pressure Control System
Combined system including pressure regulating, pressure safety and possibly pressure
recording and alarm systems.
3.50 Pressure Regulating System
System which ensures that a pressure is maintained at the outlet system within required
limits.
8
N.I.G.C.
July 2014
IGS-M-RS-401(1)
3.51 Pressure Safety System
System which, independent of the pressure regulating system, ensures that the outlet
pressure of that system does not exceed the safety limits.
4. REQUIREMENTS
4.1 Design and Service Conditions
The cabinet type station shall be constructed of quality components and materials in a
workmanlike manner in order to attain gas tightness, stability of performance and
sustained accuracy over the range of operating conditions with minimum of maintenances,
when reducing and measuring and measuring natural gas. Such stations shall have the
general characteristics listed below:
4.1.1 All design aspects and criteria for these stations shall be according to ANSI B 31.8.
4.1.2 The normal inlet pressure, outlet pressure and capacity of the station shall be as
Table 1.
TABLE 1 - Station Type and Classification
Type No.
Station
Inlet Pressure
bar (psig)
Outlet Pressure
Bar (psig)
Capacity
(scm/h)
400.1
400.2
3-4(45-60)
3-4(45-60)
1000
2500
1
Metering
4000
1000
10-17.2(150-250)
10-17.2(150-250)
2500
5000
10000
400.1
400.2
2
Reducing &
Metering
1000
10 -17.2(150-250)
3-4(45-60)
2500
5000
10000
9
N.I.G.C.
July 2014
IGS-M-RS-401(1)
4.1.3 The ambient temperature range for the station is -29 °C to 60 °C (-20 °F to 140 °F).
4.1.4 The stations shall be designed, constructed and located such that the risk and
nuisance to the environment of the stations and its operation are kept within acceptable
limits.
4.1.5 Usually, gas delivery is a continuous process. If an unintended cessation of gas flow
can cause a safety hazard or operational problems, the station shall be such that a failure
of the measuring and reducing station will not stop the gas flow. Extra equipment may be
added to improve the security of supply.
4.1.6 The manufacturer shall confirm that the environmental noise levels during operation
of station shall be according to Appendix A.
In addition no design changes or modifications shall be undertaken which cause the
established noise limits to be exceeded.
4.1.7 The reference standards and specifications for the main components of station shall
be as per Appendix B (data sheet) and the manufacturer/supplier shall verify the
compliance of them with the related standards and specifications.
4.1.8 The design and operation of the station shall be such that the venting of gas to the
atmosphere is kept to a minimum. This shall be assessed during the design stage.
4.1.9 the station shall be designed such that the correct functioning is ensured for all
specified pressure and temperature ranges (i.e. MOP , TOP , MIP , minimal pressure at
station entrance , Tmin , Tmax , ambient temperature) as well as impurities, dusts or
condensates present in the gas.
4.1.10 Health and safety warning notices shall be positioned and maintained on, or
adjacent to, the station and, additionally, to call attention to any special features of the
system.
An easily visible notice shall be positioned and maintained on /or near the station to
indicate the action to be taken in the event of an escape of gas.
Note: see legal requirements, if any.
4.1.11 The manufacture shall submit the safety procedures for the operation and
maintenance of the station.
4.1.12 During the design and construction phases, quality assurance is essential to
ensure the basic integrity of the installation. During operation basic integrity shall be
preserved until the installation is de - commissioned.
Any party involved in design, construction, commissioning, operation and maintenance
should maintain an appropriate quality management system considering the presence of
hazardous areas. Such a system should be agreed on between the parties and may be
based e.g. on the EN ISO 9000 series.
Inspection and testing of the installation are responsibilities of the operator of the station.
National regulations may require that the inspection and testing have to be witnessed and
accepted by independent experts.
10
N.I.G.C.
July 2014
IGS-M-RS-401(1)
4.1.13 The measuring system selected shall be sufficiently accurate to reduce random
and systematic errors to such a level that contractual or legal obligations are fulfilled and
that can be justified on technical and economic reasons.
4.1.14 Care should be given to avoid pulsating flow and vibrations (Resonance).
4.1.15 In general it is necessary to insert at least one upstream isolating valve and one
downstream isolating valve for each meter run.
4.1.16 According to needs, a station is equipped with the following main components:
- Isolating valves
- Monitoring systems including recorders and loggers
- Dry gas filters
- Equipment for reduce the noise level
- Equipment for measuring the flow
- Vibration damping equipment
- Equipment for controlling the pressure (regulators)
- High pressure safety equipment (such as safety shut off and safety Relief valve)
- Pipework, insulating joints
- Other components
4.1.17 The design shall be based on the minimum and maximum values for:
- Volume flow rate at standard conditions
- Design pressure and operating pressure
- Gas and ambient temperature
- The components of the gas
4.1.18 Each measuring station shall be equipped with the instrumentation required for
measuring/calculating the variables needed to meet the accuracy requirements.
The measuring system consists of a gas meter and in general also of a conversion device
with sensors for the various parameters needed for the determination of the delivered
quantity.
The conversion device shall be compatible with the gas meter and the suitability of it shall
be approved by the manufacture of the meter.
Due regard shall be given to possibilities by which field maintenance, checking and
recalibration can be carried out.
4.1.19 The meter shall be selected so that, under foreseeable fault conditions within the
installation, the maximum working pressure for which the meter has been designed and
tested is not be exceeded. The meter shall operate satisfactorily over all specified ranges
of pressure, temperature and flow.
4.1.20 If the measurement is done under operating conditions a conversion device shall
be fitted to the measuring system. The output of this device may be in volume at standard
condition.
11
N.I.G.C.
July 2014
IGS-M-RS-401(1)
4.1.21 The measuring system may be fitted with pulse transmitters to generate pulses
proportion to the measured gas volume for transmission to other equipment such as
totalizers, recorders or telemetry equipment. Transmitter range and pulse significance
shall be suitable for the application.
Results of measurement may be displayed recorded and logged as analogue or digital
data and may be recorded or stored by suitable devices as function of time or volume.
4.1.22 For the layout of piping, the following requirements shall be taken in to account.
The internal diameter of pipework of the measuring station should be calculated for gas
velocities not higher than 20 m/s:
- Gas meters shall be installed in the pipeline in accordance with the applicable
standard and to manufacturer's instructions.
- For meters a well developed velocity profile, axi symmetric and free of swirl, is
essential to obtain accurate flow measurements. In order to obtain acceptable velocity
profile conditions the following general measures shall be taken into account:
1- The required upstream and downstream pipe section and the gas meter shall have
the same nominal diameter.
2- The inlet isolating valve for the station shall be plug valve, regular patent, flanged
end and pressure balance type for class 300 and standard type for class 150.
3- The outlet isolating valve shall be ball valve, full bore, flanged end.
4- The meter for station shall be turbine type.
5- The gas turbine meter shall be installed at upstream of station. It's recommended
that, if a regulator is installed upstream of a meter, precautions are taken. Use of
pipe fittings or equipment that produce markedly asymmetric velocity profiles and/or
swirls shall be avoided within a sufficient length upstream of the gas meter.
6- If the upstream conditions necessary for a specific meter to maintain its accuracy
cannot be obtained, an adequate flow conditioning device shall be used.
Downstream of any flow conditioning device, a straight length of pipe should be
allowed to let the velocity profile develop to the required quality in terms of velocity
and turbulence distribution.
4.1.23 All electrical and electronic systems if used in a station shall comply with the IEC
related standards and the manufacturer delivers a written statement and a report showing
that the performance of the instrument complies with the requirements.
4.1.24 Meters and the associated instrumentation are precision devices and as such they
shall be handled with care. They should be stored in a clean dry condition, taking due
regard of the manufacturer's recommendations on stacking and handling. The meter inlet
and outlet connections shall be protected to prevent ingress of foreign material and
moisture and shall remain so prior to installation.
The installation of all instruments shall ensure a proper readable indication.
4.1.25 Gas meter pipework shall be installed and supported in such a manner to avoid
undue stress being placed upon the gas meter connections e.g. by supporting them.
Easy removal and replacement of the gas meter shall be possible.
12
N.I.G.C.
July 2014
IGS-M-RS-401(1)
4.1.26 If necessary and specified at data sheet, inlet and outlet headers of stations shall
be equipped with thermometers.
4.1.27 The area of the cabinet shall be adequate to accommodate the equipment and
provide access for maintenance purpose. The closeness between the equipment and
cabinet shall not less than 30 cm.
Where necessary , vulnerable pipework or equipment shall be protected.
4.1.28 The extent of a hazardous area shall be determined according to API RP 500. The
possible hazardous area should be taken into account When fixing the site boundary.
4.1.29 Stations shall be secured against entry by unauthorized person. If a site security
fence is used, equipment shall be sited at a sufficient distance from the fence to prevent
interference from outside.
Consideration should be given to the provision, wherever possible, of locking devices for
valves, including auxiliary valves located to a housing.
Prominent sings prohibiting smoking and other ignition sources shall be displayed.
Signs showing an emergency telephone number should be clearly displayed.
4.1.30 The stations should not be connected to sewer.
4.1.31 The space in which the gas pressure regulating and metering equipment is
installed shall be ventilated directly to atmosphere by means of apertures. These
apertures, which may be ventilation ducts shall be distributed as equally as possible
between high and low level over the length of the walls and/or the roof and positioned to
provide effective ventilation of the entire space. The ventilation apertures shall be
protected so that materials and objects can not be inserted and the apertures can not be
blocked. The combined open area of the protected apertures shall not be less that the
prescribed minimum ventilation area.
4.1.32 The access doors of spaces housing gas pressure regulation and metering
equipment shall be provided with locks. Doors shall be opened from the outside by mean
of a key. The doors shall open outwards and it shall be possible to fix them in an open
position.
In the case of accessible spaces, it shall be possible to open the doors from the inside
without a key.
4.1.33 Smoking and other ignition sources shall be prohibited within hazardous areas.
Prominent prohibiting signs shall be displayed on the cabinet.
4.1.34 Due to the possibility of dust or liquid being entrained in the gas stream impairing
the proper functioning of the equipment, consideration shall be given to a dust or liquid
extraction system. The systems shall have adequate capacity based on the maximum gas
flowrate at minimum pressure. For filters a differential pressure gauge should be provided
to indicate the level of contamination of the filter.
Closures shall be constructed in such a way that they can be opened without risk.
13
N.I.G.C.
July 2014
IGS-M-RS-401(1)
4.1.35 Pressure regulating processes generate noise which can, if untreated, be radiated
by some parts of a station to produce unacceptably high noise levels. These can:
- Create nuisance to inhabitants in the locality of the station
- Create a hearing hazard to personnel working on the equipment
- Result in component failure
4.1.36 Consideration shall be given at the design stage to the incorporation of noise
control features to limit noise to an acceptable level at the site boundary or near inhabited
building. This level shall be according to Appendix A.
4.1.37 Gas escaping through apertures in ancillaries could result in a flammable mixture in
an enclosed space . To avoid this, the following provisions may be used:
- Apertures Fitted With Vent lines to outside the room
- Restriction in breather connections, provided the operational performance is not
impaired
- Extra ventilation of the room
The above apertures also include breather holes serving diaphragms in pressure
regulators and safety devices. If vent lines are fitted to these apertures, they shall be of
sufficient capacity so that the gas can escape freely and the functioning of pressure
regulators and safety devices is not adversely affected by pressure build-up in the line.
4.1.38 Vent lines working at the same pressure may be combined. provided that leakage
through one or more does not affect the operation of any equipment.
The terminals of vent lines shall be located at a safe distance from sources of ignition.
All vent terminals shall be designed to suit the local conditions.
Suitable precautions shall be taken to prevent blockage of the outlet and to protect it
against the ingress of foreign material. Dedicated vent and depressurizing lines shall not
be combined with breathing lines in a manifold. If manifolds are used for a type of vent line
this shall not impair the proper functioning of the connected units.
4.1.39 The possible hazardous area of the gas pressure regulating station shall be
classified in zones according to EN 60079-10. Electrical installation in hazardous areas
shall comply with prEN 50154.
4.1.40 Consideration should be given to measures for the protection against lightning
strikes. The provision shall satisfy the relevant standards.
Overvoltage protection for cables and electrical units should be used.
In the case of electronic devices these provisions may be completed by using overvoltage
fine protection units for adequate protection of the devices.
The cabinet and all electrically conductive parts of the installation should be bonded and
connected to earth. Care should be taken to avoid interaction is between the electrical
earthing, instrumentation earthing and cathodic protection systems.
4.1.41 Welding of steel pipework shall be done in accordance with API 1104.
14
N.I.G.C.
July 2014
IGS-M-RS-401(1)
4.1.42 The station shall be separated electrically from the inlet and outlet pipework by
means of insulating flanges or isolating joints in installation.
4.1.43 Each station shall consist of two separate runs with capacity of 100% of maximum
capacity of station.
Note: for metering station (4-4) bar (60-60 psig) and reducing and metering 10-17.2 bar (150-250
psig) to 4 bar (60 psig) with capacity of 400 scm/h, the arrangement of station may consist of one
run.
4.1.44 Each run of regulating cabinet station shall be equipped with:
a- A safety shut off device integrated with the regulator of station and only one partial relief
valve for station or;
b- Regulator with integrated safety shut off valve and an independent safety shut off
device.
4.1.45 In general, for commissioning purposes of cabinet station, each run shall consist of
pressure gauge, drain valve and sensing line before outlet of isolating valve.
In case of limitation of sensing line length, additional sensing line shall be considered for
operation.
4.1.46 The relief system discharge capacity range for stations (type 2 Table 1) shall be
(2-3) % of maximum capacity of each line of stations.
4.1.47 The cabinet shall have adequate strength against the conditions due to
transportation, installation, operational conditions such as ambient temperature, different
climatic conditions, wind (with velocity of 120 km/h) and earthquick (according to zone 3.1
California) without any deformation. Any device shall have suitable supports.
4.1.48 The cabinet shall be equipped with:
- Suitable eye-ring for transportation and installation correlated to the center of gravity
of station
- Provisions for maintenance purposes
- Related bolts for installation
4.2 Materials
4.2.1 The materials of all components of station whether specified or unspecified shall be
suitable for pressure, temperature and other operating conditions specified as per
Appendix B (data sheet).
4.2.2 All component of the station shall be resistant to or protected against corrosion, e.g.
by being painted or coated.
4.2.3 All components such as pipework, filters, regulators, meters flanges, gaskets, joints,
etc. installed at station shall be constructed of materials complying with the related
standards and specification as per Appendix B (data sheet).
15
N.I.G.C.
July 2014
IGS-M-RS-401(1)
4.2.4 The cabinet shall be made of steel plate according to ASTM A 283 grade B,C with
minimum thickness of 3 mm.
5. INSPECTION, TESTS AND CERTIFICATION
5.1 Prior to Fabrication
Before starting the fabrication, the manufacturer shall submit the following documents to
end user:
- Welders certificates
- WPS (welding procedure specification)
- PQR (procedure qualification reports)
- QCP (quality control plan)
5.2 Inspection Documents
Prior to the shipment of each station to NIGC or end users, the manufacturer shall perform
the specified tests and checks performed shall be documented in a report and shall
include at a minimum the following items and prepared by the manufacturer and submitted
to the NIGC or end users:
a- The name and address of the manufacturer
b- The name and the address of the test facility
c- The model and serial number
d- The date(s) of the test
e- The name and title of the person (s) who conducted the tests
f- A written description of the test procedures
At least one copy of the completed report shall be sent to the NIGC or end users and
completed report is available to the operator on request, for a period of 10 years after
shipment of any station.
5.3 Tests
5.3.1 Visual inspection
Visual inspection including checking of workmanship, painting, connections, internal parts,
nameplate, etc. No apparent imperfection shall be observed.
5.3.2 Strength test
All pressure containing components of stations including pipeworks, shall be strength
tested before painting. The station shall be designed to withstand the internal pressure
using an appropriate safety factor for its components material at maximum inlet pressure
(Pmax). It shall be tested to ensure it has sufficient strength to operate safely.
Each cabinet station shall be hydrostatically tested at a pressure of 1.5 times of the
related maximum operating pressure of the station for two hours. No leakage and
deformation shall be observed.
16
N.I.G.C.
July 2014
IGS-M-RS-401(1)
5.3.3 Tightness test
After the strength test before painting, any component which has been removed from the
installation during testing shall be re-installed.
The entire installation shall then be subjected to a tightness test at 1.1 maximum operating
pressure for a minimum 15 minutes in each section of the installation.
Air, inert or gas shall be used as a test medium. There shall be no visible leakage when
tested with a detection fluid.
5.3.4 Dimensional check
The dimensional checks are including of compliance of the station construction with the
pertinent assembly drawing and the dimensional conformity of all components, sizes,
dimensions and etc. with the applicable drawings.
5.3.5 Materials checks
The verification of the material used shall be carried out by the review of material
certificates in compliance with this specification.
5.3.6 Paint test
The painting of the cabinet type station shall be check in compliance with section 6 of this
specification in terms of color, thickness and adhesion.
5.3.7 Quality assurance
The manufacturer shall establish and follow a written comprehensive quality assurance
program for the assembly and testing of the cabinet type station (e.g. ISO 9000, etc).
This quality assurance program should be available to the inspector.
5.4 Inspection and Certificates
5.4.1 Prior to shipment of the station, the manufacturer should make the following
available for the inspector’s review:
Material certificates, weld inspection reports, pressure test reports and final dimensional
measurements.
5.4.2 The manufactured station will be inspected and the inspection shall cover the
following stages as specified in this specification and according to terms and conditions of
purchase order. Manufacturer shall provide and present to NIGC inspector test result for
different examinations correlated to serial number and material test certificates according
to requirements of NIGC specification:
1- Visual inspection
2- Strength test
3- Tightness test
4- Dimensional check
5- Material check
6- Paint test
7- Quality assurance
17
N.I.G.C.
July 2014
IGS-M-RS-401(1)
6. PAINTING
6.1 The external surface of cabinet, pipes, fittings, skid of station shall be thoroughly
cleaned by removing all rust and mill scale. Surfaces to be painted shall be completely
free from grease, grit and foreign material.
6.2 The systems for painting and paint specification for cabinet, pipes, fittings and skid
shall be according to item 3 of IGS-CH-041 (0) : 2003.
6.3 Final colour for station shall be as following:
1- The colour of cabinet shall be green and the paint specification shall be according to
BS 381 C No. 217.
2- The colour of internal equipments and components of station such as valves, filters,
meters, regulators and others shall be according to the related standards and
specifications.
3- The colour of pipes, fittings and flanges shall be white yellow and the specification of
paint shall be according to 10 E 53 BS 4800.
4- The colour of skid shall be white orange and paint specification shall be according to
BS 381 C No. 55.
7. MARKING
Each station must carry, grouped together, on steel or aluminum badge plate (S) the
following information:
1- The manufacturer name, model number, serial number, month and year
Manufactured
2- Minimum and maximum inlet pressure bar (psig)
3- Outlet pressure bar (psig) for reducing stations and minimum and maximum outlet
pressure bar(Psig) for measuring stations
4- Maximum capacity (scm/h)
5- Purchase order and item number
These inscriptions must be directly visible, easily legible and indelible under the normal
condition of use of the station.
8. PACKING AND PACKAGING
Each instrumentation device of station shall be covered by suitable plastic. All openings
such as inlet, outlet covered by plastic caps.
Packing and packaging of cabinet station shall be according to manufacturer instructions.
18
N.I.G.C.
July 2014
IGS-M-RS-401(1)
9. DOCUMENTATION
9.1 With Technical Quotation
The manufacturer is required to complete and sign the attached data sheet (S) and as well
as two sets of the following documentation in English. All documentation should be dated:
9.1.1 A description of the station, giving the technical characteristics and the principle of
its operation such as the basis design data including minimum and maximum inlet
pressure, outlet pressure and maximum capacity;
9.1.2 The P & I diagram for station;
9.1.3 The detailed drawing of the station including:
- A dimensioned drawing
- A drawing showing the location of each important components
- A drawing showing the installation of each important components
- The specification of each component including size, class, material and manufacturer
name
- Wind resistance calculation
- Foundation calculation (including wind and earthquick effects)
9.1.4 The original printed technical catalogues and certificates;
9.1.5 Supports, cabinet drawing including material, size, …;
9.1.6 Recommended two years spare parts list for each major components;
9.1.7 Documentation that the design and construction comply with applicable safety codes
and regulations;
9.1.8 A list of documents submitted.
9.2 After Receipt of Order
In case of order placement, the manufacturer shall submit one set per station in addition
five sets of the following documents:
9.2.1 A description of the station, giving the technical characteristics and the principle of
its operation such as the basis design data including minimum and maximum inlet
pressure, outlet pressure and maximum capacity;
9.2.2 The P & I diagram for station;
19
N.I.G.C.
July 2014
IGS-M-RS-401(1)
9.2.3 The detailed drawing of the station including:
- A nomenclature of components of station
- A dimensioned drawing
- A drawing showing the location of each component
- A drawing showing the installation of each important component
- The specification of each component including size, class, material and manufacturer
name
- Wind resistance calculation
- Foundation calculation (including wind and earthquick effects)
9.2.4 The original printed technical catalogues and certificates;
9.2.5 Supports, cabinet drawing including material, size, … ;
9.2.6 All tests reports and weld records;
9.2.7 Instructions for installation, operation, maintenances and troubleshooting;
9.2.8 Foundation drawings;
9.2.9 Documentation that the design and construction comply with applicable safety codes
and regulations;
9.2.10 A list of documents submitted.
10. GUARANTEE
10.1 Manufacture shall guarantee the compliance of material and performance of the
supplied equipment with this specification.
10.2 The guarantee period shall be 2 years after equipments goes on stream or 3years
from date of shipment, whichever occurs first and 10 years after sale services.
10.3 Supplier shall agree to repair on site or replace any part, equipment or unit which
proves to be defective during the above mentioned period free of charge.
20
‫)‪IGS-M-RS-401(1‬‬
‫‪N.I.G.C.‬‬
‫‪July 2014‬‬
‫"‪APPENDIX "A‬‬
‫ﻣﺼﻮﺑﻪ ﺷﻤﺎره ‪ 236‬ﺷﻮراي ﻋﺎﻟﻲ ﺣﻔﺎﻇﺖ ﻣﺤﻴﻂ زﻳﺴﺖ )ﻣﺼﻮب ‪(1381/3/21‬‬
‫در اﺟﺮاي ﻣﺎده ‪ 2‬آﻳﻴﻦ ﻧﺎﻣﻪ اﺟﺮاﻳﻲ ﻧﺤﻮه ﺟﻠﻮﮔﻴﺮي از آﻟـﻮدﮔﻲ ﺻـﻮﺗﻲ ﻣﺼـﻮب ﺟﻠﺴـﻪ ﻣـﻮرخ ‪ 1378/3/19‬ﻫﻴـﺄت وزﻳـﺮان‬
‫ﺣﺪود ﻣﺠﺎز ﺻﺪا در ﻫﻮاي آزاد اﻳﺮان ﺑﺸﺮح ذﻳﻞ ﺗﻌﻴﻴﻦ و ﻣﻮاﻓﻘﺖ ﻣﻲﺷﻮد ﻛﻪ از ﺗﺎرﻳﺦ ﺗﺼﻮﻳﺐ در ﺳﻄﺢ ﻛﺸﻮر ﺑﻪ ﻣـﻮرد اﺟـﺮا‬
‫ﮔﺬارده ﺷﻮد‪.‬‬
‫روز ‪ 7‬ﺻﺒﺢ اﻟﻲ ‪ 10‬ﺷﺐ‬
‫ﺷﺐ ‪ 10‬ﺷﺐ اﻟﻲ ‪ 7‬ﺻﺒﺢ‬
‫‪(A) Leq (30) db‬‬
‫‪(A) Leq (30) db‬‬
‫‪1‬‬
‫ﻣﻨﻄﻘﻪ ﻣﺴﻜﻮﻧﻲ‬
‫‪55‬‬
‫‪45‬‬
‫‪2‬‬
‫ﻣﻨﻄﻘﻪ ﺗﺠﺎري – ﻣﺴﻜﻮﻧﻲ‬
‫‪60‬‬
‫‪50‬‬
‫‪3‬‬
‫ﻣﻨﻄﻘﻪ ﺗﺠﺎري‬
‫‪65‬‬
‫‪55‬‬
‫‪4‬‬
‫ﻣﻨﻄﻘﻪ ﻣﺴﻜﻮﻧﻲ – ﺻﻨﻌﺘﻲ‬
‫‪70‬‬
‫‪60‬‬
‫‪5‬‬
‫ﻣﻨﻄﻘﻪ ﺻﻨﻌﺘﻲ‬
‫‪75‬‬
‫‪65‬‬
‫ردﻳﻒ‬
‫‪‬‬
‫ﻧﻮع ﻣﻨﻄﻘﻪ‬
‫‪ A  (A) Leq (30) db‬ﺗﺮاز ﻣﻌﺎدل در ﻣﺪت زﻣﺎن ‪ 30‬دﻗﻴﻘﻪ اﻧﺪازهﮔﻴﺮي در ﺷﺒﻜﻪ وزﻧﻲ ﻣﻲ ﺑﺎﺷﺪ و واﺣﺪ آن دي ﺳﻲ ﺑﻞ اﺳﺖ‪.‬‬
‫ﻣﻨﻄﻘﻪ ﻣﺴﻜﻮﻧﻲ ‪ :‬ﻣﺤﺪودهاي اﺳﺖ ﻛﻪ ﺑﻴﺶ از ‪ 50‬درﺻﺪ آن داراي ﻛﺎرﺑﺮي ﻣﺴﻜﻮﻧﻲ ﺧﺎﻟﺺ ﺑﺎﺷﺪ و ﺑﻘﻴﻪ آن )ﻋﻼوه ﺑـﺮ ﺷـﺒﻜﻪ‬
‫ﻣﻌﺎﺑﺮ( ﺷﺎﻣﻞ ﺧﺪﻣﺎت ﻣﺮﺑﻮط ﺑﻪ ﻣﺴﻜﻮﻧﻲ و ﺑﺪون ﻣﺰاﺣﻤﺖ ﺑﺮاي ﻣﺴﻜﻮﻧﻲ ﺑﺎﺷﺪ‪.‬‬
‫)آﻣﻮزﺷﻲ ردهﻫﺎي ﭘﺎﻳﻴﻦ‪ ،‬ﺗﺠﺎري در ﺣﺪ روزﻣﺮه‪ ،‬ﻓﺮﻫﻨﮕﻲ روزﻣﺮه(‬
‫‪21‬‬
N.I.G.C.
July 2014
IGS-M-RS-401(1)
APPENDIX "B"
Data sheet
To be Filled by NIGC
To be Filled by Manufacturer/Supplier
Inquiry No. :
Quotation No. :
Inquiry Data :
Quotation Date :
NIGC Standard : IGS-M-RS-401 (1) : 1392
Catalogue No. :
The Data Sheet is Provided by
Manufacturer 
Inquiry Data
Item
Indent
item No.
Inlet
pressure
bar (psig)
Outlet
pressure
bar (psig)
Supplier 
Offered Data
Maximum
capacity
(scm/h)
Manufacturer signature and stamp :
22
Item
No.
Inlet
pressure
bar (psig)
Outlet
pressure
bar (psig)
Maximum
capacity
(scm/h)
N.I.G.C.
General
Item
July 2014
IGS-M-RS-401(1)
To be Filled by NIGC
To be Filled by
Manufacturer/Supplier
Gas temperature
-10 0C to 55 0C (+14 0F to 131 0F)
-----
Ambient temperature
-29 0C to 60 0C (-20 0F to 140 0F)
Yes 
No
Max. relative humidity
……………
Yes 
No
Yes 
No 
Description
Station location
Residential 
Commercial - Residential 
Commercial 
Residential – Industrial 
Industrial 
Maximum noise level
limitation
According to Appendix A
Manufacturer signature and stamp :
23
N.I.G.C.
Item
July 2014
Description
To be Filled by NIGC
Manufacturer
Type
Class rating
Size (in)
Hydrostatic test pressure
References standard including
design, fabrication, material,
testing, etc
Fire safe
Body, bonnet, cover, plug,
ends
Plug Valve
Plug
Non-metallic parts
Connection
Stem design
Operating temperature range
Anti static design
Sealant injection
Plug surface
Additional request
IGS-M-RS-401(1)
To be Filled by
Manufacturer/Supplier
………
Pressure balance 
Standard type 
Lubricated 
Wrench operated 
150 
300 
1.5 M.A.W.P
API 6D
and
IGS-M-PL-002-1
API 607
or
API 6FA
Cast carbon steel at least
acc to ASTM A 216 grade
WCB/WCC
Forged carbon steel at least
acc. to ASTM A 105
Cast carbon steel at least
acc to ASTM A 216 grade
WCB/WCC
Forged carbon steel at least
acc. to ASTM A 105
acc. to ASTM D 2004 , HK
710 or ASTM D 145
Flanged end R.F, S.F*
acc. to ANSI B16.5
Anti-blow out stem
-29 °C to 60 °C
Yes 
Yes 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
150 
300 
………..
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
No 
No 
No 
No 
No 
No 
Special treatment,
electroless nickel plated
with minimum 25 μm
thickness as per
ASTM B 656
Yes 
No 
Special treatment, hard
chromium plated with
minimum 25 μm thickness
as per ASTM B 650
Yes 
No 
Manufacturer catalogs
including detail sectional
drawing, test certificates
acc. to API 6D and
IGS-M-PL-002-1
Yes 
No 
*:Serrated finished
Manufacturer signature and stamp:
24
N.I.G.C.
Item
July 2014
Description
To be Filled by NIGC
Manufacturer
Type
Class rating
Size (in)
Hydrostatic test pressure
References standard including
design, fabrication, material,
testing, etc
Fire safe
Body, bonnet, cover, ends
Ball Valve
Ball
Connection
Stem design
Anti static design
Ball surface
Stem
Stem surface
Additional request
IGS-M-RS-401(1)
To be Filled by
Manufacturer/Supplier
………
Full bore, split body,
trunnion mounted
150 
300 
Yes 
No 
150 
300 
…..
1.5 M.A.W.P
API 6D
and
IGS-M-PL-010-1,2
API 607
or
API 6FA
Cast carbon steel at least
acc to ASTM A 216 grade
WCB/WCC
Forged carbon steel at
least acc. to ASTM A 105
Cast carbon steel at least
acc to ASTM A 216 grade
WCB/WCC
Forged carbon steel at
least acc. to ASTM A 105
Flanged ends R.F, S.F*
acc. to ANSI B16.5
Anti-blow out stem
Yes 
Special treatment,
electroless nickel plated
with minimum 25 μm
thickness as per
ASTM B 656
Special treatment, hard
chromium plated with
minimum 25 μm thickness
as per ASTM B 650
Forged carbon steel at
least acc. to ASTM A 105
or BS 1503 Grade 221/550
Bar alloy steel at least acc.
to AISI 4140
Electro less nickel plated
Hard chromium plated
Manufacturer catalogs
including detail sectional
drawing, test certificates
acc. to API 6D and
IGS-M-PL-002-1
*:Serrated finished
Manufacturer signature and stamp:
25
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
Yes 
Yes 
Yes 
No 
No 
No 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
Yes 
No 
No 
Yes 
No 
N.I.G.C.
Item
July 2014
Description
IGS-M-RS-401(1)
To be Filled by NIGC
Manufacturer
Maximum capacity at minimum inlet
pressure and outlet set pressure (scm/h)
Class rating
Size (in)
Gas inlet pressure (psig)
Maximum operating pressure
Set pressure (psig)
Lock-up pressure at maximum inlet
pressure (psi)
Design pressure
Test pressure
Type
Fail safe design
Regulator
Safety shut-off valve type
Safety shut-off valve pressure
Noise reduction device
Connection type
Valve body material
Internal metallic parts material
Valve mechanism material
Pilot body material
Internal non-metallic parts
Sensing line material
Pilot type/model
Pilot spring range (barg)
Pilot setting (barg)
Optional accessory
Reference standard IGS-M-IN-202(0):
2009
To be Filled by
Manufacturer/Supplier
……………
min:……….
max:………
min:…….
max:……
min:………. max:………
250 psig (17.2 bar) 
60 psig (4.2 bar) 
min:…….
Yes 
Yes 
max:……
No 
No 
……………
Yes 
No 
720 psig (50 bar) 
1080 psig (74 bar) 
Axial 
Conventional pilot operated 
Conventional spring loaded 
Other 
Regulator fail to open 
Regulator fail to close 
Slam type 
72 psig (5 bar) 
Light metal or equivalent 
Flanged ends R.F, S.F* 
acc. to ANSI B16.5 
Carbon steel acc. to ASTM A 216
grade WCB 
Forged carbon steel acc. to
ASTM A 105 
Seamless pipe acc. to API Suitable for
-29 °C to 60 °C ambient temperature 
Corrosion resistant material such as
S.S 
Corrosion resistant plated steel 
S.S type 316 
Carbon steel acc. to ASTM A 216
grade WCB 
Forged carbon steel acc. to
ASTM A 105 
Die cast aluminum acc. to
ASTM B 85
Brass acc. to ASTM B 283
grade C 37700 
Rubber or plastic material resistant to
odorized natural gas 
S.S type 316 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
No 
No 
No 
No 
No 
No 
No 
No 
No 
No 
No 
No 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
Yes 
No 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
300 
Yes 
*:Serrated finished
Manufacturer signature and stamp:
26
Yes 
No 
……………
……………
……………
Filter 
Others 
Yes 
No 
N.I.G.C.
Item
July 2014
Description
IGS-M-RS-401(1)
To be Filled by NIGC
Manufacturer
……………
Installation
Class rating
Inlet/outlet connection
Flange material
Dry Gas Filter
Design pressure
Test pressure
Inlet pressure range (psig)
To be Filled by
Manufacturer/Supplier
150 
300 
Flanged ends R.F, S.F*
acc. to ANSI B16.5
ASTM A 105
1.1 *M.W.P
1.3 *Design pressure
45-60 psig (3-4 bar) 
150-250 psig (10-17.2 bar) 
Horizontal 
Vertical 
150 
300 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
……………
……………
Horizontal
Maximum capacity (scm/h)
Construction standard
ASME "U" stamped
ASME sec, VIII, Div.1
Body material
Yes 
No 
Yes 
No 
ASTM A 106 grade B
Yes 
No 
Head and hub
Forged acc. to ASTM A 105
Yes 
No 
Corrosion allowance
1.6 mm
Quick opening closure with
safety bleed inter lock
Yes 
No 
Yes 
No 
is required
Yes 
No 
is required
Yes 
No 
Tow Lubricated plug valve,
flange ends
Yes 
No 
Yes 
Yes 
No 
Type of closure
The documentation for calculation
of filtration area
The documentation for calculation
design pressure vessel
Drain valve
Yes 
Other characteristics of dry gas
filter acc. to IGS-M-PM-105
*:Serrated finished
Manufacturer signature and stamp:
27
No 
N.I.G.C.
Item
July 2014
Description
To be Filled by NIGC
Flow direction
To be Filled by
Manufacturer/Supplier
OUT to IN
Yes 
No 
Polypropylene or Polyester Media
Yes 
No 
Cellulose Paper Media
Yes 
No 
G number of element according
to related standard
…………
Yes 
No 
Element ID (mm)
…………
Yes 
No 
Element OD (mm)
…………
Yes 
No 
Element H (mm)
…………
Yes 
No 
Element filtration area (m2)
…………
Yes 
No 
Caps thickness (mm)
…………
Yes 
No 
Inner core thickness (mm)
…………
Yes 
No 
Outside case thickness (mm)
…………
Yes 
No 
IGS-M-PM-111
Yes 
No 
Material of media
Dry Gas Filter Cartridge
IGS-M-RS-401(1)
Ref- standard for cartridge
Manufacturer signature and stamp:
28
N.I.G.C.
Item
July 2014
Description
To be filled by NIGC
Manufacturer
Gas inlet pressure (bar/psig)
Ambient temperature range
Gas temperature range
Flow straightner
Capacity with air at atmospheric
conditions (±100 mbar) at
maximum pressure loss(CMH)
Meter mounting
Size (in)
Class rating
Index
Length (F to F) (mm)
Minimum up stream length
according manufacturer
recommendation (mm)
Minimum downstream length
according manufacturer
recommendation (mm)
Connection type
Material
Correcting Device
Turbine Meter
Test pressure (psig)
Type
Transmission system
Frequency pulse
generator
Measuring unit
Index case
Type
Standard
Manufacturer
Model NO.
The compatibility of
correction device with
turbine meter
Body
IGS-M-RS-401(1)
To be filled by
Manufacturer/Supplier
……………
min:………. max:………
-29 °C to 60 °C
-10 °C to 55 °C
Is required (built in)
……………
Horizontal
………..
Class 150 
Class 300 
412 psig (28 bar) for class 150 
1080 psig (75 bar) for class 300 
3D
min:……….
Yes 
Yes 
Yes 
Yes 
max:………
No 
No 
No 
No 
Yes 
No 
………..
Class 150 
Class 300 
412 psig (28 bar) for class 150 
1080 psig (75 bar) for class 300 
Yes 
No 
……………
……………
Flanged ends R.F, serrated
finished acc. to ANSI B16.5
Direct reading, digital
Magnetic coupling
Yes 
No 
Yes 
Yes 
No 
No 
LF and HF
Yes 
No 
CMH
Dust & hummidity proof (IP 65)
Yes 
No 
Volume corrector
Yes 
No 
IGS-M-IN-106
Shall be approved by the
manufacturer of turbine meter
………………….
…………………
…………………
Yes 
No 
Carbon steel acc. to ASTM A216
grade WCB/WCC,
or
Forged carbon steel acc. to
ASTM A 105
……………
Stainless steel type 316
……………
Turbine wheel
Aluminium acc. to ISO 6012
……………
Shaft
Gearing
Flange
Stainless steel type 316
Stainless
Forged carbon steel acc. to
ASTM A 105
……………
……………
Bearing
Manufacturer signature and stamp:
29
……………
N.I.G.C.
Item
July 2014
Description
To be filled by NIGC
Yes 
No 
30:1 
Yes 
No 
50:1 
Yes 
No 
Qmin ≤ Q < Qt : ±2%
Yes 
No 
Qt ≤ Q ≤ Qmax : ±1%
Yes 
No 
20:1
0.2Qmax
Yes 
No 
30:1
0.15Qmax
Yes 
No 
50:1
0.1Qmax
Yes 
No 
Maximum pressure loss value
at Qmax with atmospheric air
P=1500 Pa (P=15 mbar)
Yes 
No 
Accuracy curve (issued by
manufacturer)
Required for each meter
Yes 
No 
meter immersed in water
casing
Required for each meter
(size/class)
Yes 
No 
Hydraulic test(1.5*M.W.P)
Required for each meter
Yes 
No 
Required for each type of
meter (size/class)
Yes 
No 
Required for each meter
Yes 
No 
External leak test
Required for each meter
Yes 
No 
Error of indication
Required for each meter
Yes 
No 
Linearity
Required for each meter
Yes 
No 
Pressure range
Required for each meter
Yes 
No 
Calculation of WME
Required for each meter
Yes 
No 
Marking
Required for each meter
Yes 
No 
Self lubricated for 2"/150 and
3"/150
Yes 
No 
Yes 
No 
Yes 
No 
Maximum permissible errors
Transitional flow rate Qt
Bearing lubrication
maintenance
To be filled by
Manufacturer/Supplier
20:1 
Type tests certificate issued
by a national standard
organization
Body strength test
Type Test
Turbine Meter
Routine
Test
Design Condition
Range ability
Special lubricating tools
Lubricated by oil pump
Required 
Not required 
Oil specification
------------------
The approval certification of meters
manufacturer certify by national bureau
standard
Guarantee
Reference
standard
IGS-M-RS-401(1)
Is required
Submitted 
Not submitted 
18 months after shipment or
12 month after installation
Yes 
No 
Yes 
Yes 
No 
IGS –M-IN-102
latest edition
Manufacturer signature and stamp:
30
N.I.G.C.
Item
July 2014
Description
To be Filled by NIGC
To be Filled by
Manufacturer/Supplier
Conversion device kind
PTZ 
Conversion device type
Type 1 
Type 2 
Optical 
RS-232 
RS-485 
Corrosion resistance and
UV protection
Standard cubic meter per
hour
IP 65
Type 1 
Type 2 
Optical 
RS-232 
RS-485 
corrosion resistance 
UV protection 
Battery
AC
DC
At least 5 years
Battery 
AC 
DC 
Database interfaces
Body material
Volume measuring unit
Ingress protection (IP)
Power supply
Gas Volume Conversion Device
IGS-M-RS-401(1)
Battery life time
Certificate
Maximum permissible error
ATEX approval
EN approval
MID approval
1%
(at rated operating condition)
o.5%
(at reference condition)
Ability to correct the error of the gas
meter
Ability to adjust and correct the error of
temperature and pressure sensors
parameters
Ambient temperature
PT 
PTZ 
Yes 
No 
Yes 
No 
ATEX approval
EN approval
MID approval
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Normal range:
-29 °C to +60 °C
Special range:
-40 °C to +60 °C
Yes 
No 
Standard modbus protocol support
Capacity of memory for archive minimum
5900 record acc. to EN 12405
Operating pressure ranges (bar/psig)
T
Yes 
No 
from……..… to …………
from……… to ………
Guaranty/warranty
5 years guaranty and
15 years warranty
Yes 
No 
Reference standard
IGS-M-IN-106
Yes 
No 
Manufacturer signature and stamp:
31
N.I.G.C.
Item
July 2014
Description
Relief valve
Type
Nozzle
Class rating
Design pressure
Test pressure
Set pressure
Spring range
Ambient temperature
Maximum relief capacity
Body
Nozzle
Seat disc
Disc holder
Other characteristic of relief vale
Minimum required original
technical catalogue and
document including:
-Manufacture name, trade mark
-Type model number
-Reference standard for design,
material fabrication and testing
Drawing showing outline
dimension
Capacity table and relate
calculations
Pipe
Flange
Butt welding ends fitting
Nipple
Weldolet
Pipes , fittings,…..
Threadolet
Stud bolts and nuts
Gasket
Stud coupling
Sensing line
Gauge needle valve
Electrode
IGS-M-RS-401(1)
To be Filled by NIGC
To be Filled by
manufacturer/supplier
Spring located
Semi
CL 150
19 bar (275 psig) for ANSI CL 150
28.4 bar (412psig) for ANSI CL 150
4.6 bar(66 psig)
(3.8-5.2)bar(55-57 psig)
-29 ºC to + 60 ºC
(2-3) % of max. capacity of station
Carbon steel acc. to ASTM A 216 grade WCB or forged carbon
street acc. to ASTM A 105
Stainless steel type 316
Stainless steel type 316
Stainless steel type 316
Acc. to IGS-M-IN-302
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
Yes 
No 
No 
No 
No 
No 
No 
No 
No 
No 
Yes 
No 
Yes 
Yes 
Yes 
Yes 
No 
No 
No 
No 
Is required
Yes 
No 
Is required
Yes 
No 
Is required after order
Yes 
No 
Yes 
No 
Yes 
Yes 
No 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
Yes 
Yes 
No 
No 
No 
Yes 
No 
Yes 
Yes 
Yes 
No 
No 
No 
Yes 
No 
Yes 
Yes 
Yes 
No 
No 
No 
Sch.40, acc. to API 5L grade B or ASTM A 53 grade B or
ASTM A 106 grade B
W.N,R,F,S.F as per ASTM A 105 and ANSI B 16.5
Seamless acc. to IGS-PL-022(0), part 1
Seamless, NPT, threads as API 5B or ANSI B 1.20.1 class
rating 3000 Ib material acc. to pipe material
Seamless, butt-weld, material acc. to ASTM A 105 class rating
3000 lb, as per related MESC
Seamless, material acc. to ASTM A 105 NPT thread acc. to
API 5B or ANSI B 1.20.1, class rating 3000 lb as per related
MESC
Acc. to PLD-107 (Rev.1)
Spirally-wound, performed v-shaped, graphic filled, strip
stainless steel type 316 (for classes 150 and 300 R.F, S.F
flanges), other specification acc. to IGS- PL-008(1)
Thickness 0.175 inch
Construction & testing acc. to IGS-MS-PL-005,1993
Design, dimensions, marking acc. to BS 3381
Material strip ANSI 316 stainless steel with oil resistant graphic
compound filler
Material guide ring carbon steel with thickness 1/8 inch
Class 150 
Class 300 
Related flanges RF, S.F acc. to ANSI B16.5
Compression type, stainless steel type 316, male thread acc. to
API 5B or ANSI B1.20.1 design, etc acc. to BS 4368 part 2, joint
type material acc. to ASTM A 403 grade WP 316 API thread
acc. to API 5B or ANSI B1.20.1 supplied with union nut and olive
for use with stainless steel tubing.
Construction & testing acc. to IGS-M-PL-005, 1993
Construction specification acc. to IGS-PL-003(2), 1994
Construction standard specification acc. to IGS-PL-018(0), 1992
Manufacturer signaturer and stamp:
32
N.I.G.C.
Item
July 2014
Description
Type
Application
Ambient temperature
Connection
Mounting
Dial size : mm (in)
Dial range : bar (psig)
Scale, marking, graduation and
testing
Accuracy
Scale graduation
Dial
Pressure gauge
Case
Movement, bourdon tube and
stem material
Bezel ring
Pointer
Glass
Over pressure protection
Damping liquid
Adjustment screws for range
and linearity calibration
All internal parts
Thermo well(for the meters
unintegrated with thermo well)
To be Filled by NIGC
Insulating
joint
To be Filled by
Manufacturer/Supplier
Bourdon tube
For outdoor installation at metering/metering &
reducing station
-29 ºC to 60 ºC
1/2 (in), NPT, male, bottom, complete with
hexagon, square or two flat on the shank with
minimum thickness 12 mm
Direct
100 (4)
0-6 (0-100)
0-25 (0-400)
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
Yes 
Yes 
Yes 
No 
No 
No 
No 
Acc. to BS 1780
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
Yes 
Yes 
No 
No 
No 
Is required
Yes 
No 
Easily accessible
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Acc. to BS 1780 (1% for points above 10% and
below 90% of full scale and 1.5% for outside of
these limits)
Dual bar & psig
Aluminum alloy, white enameled with black
figures
Weather proof, material shall be 316 stain less
steel
316 stainless steel
Byonet type or threaded material, 304 stainless
steel
Adjustable micrometer type aluminum or steel,
black color
Shatter-proof
Blow out disc
Silicon oil 
Glycerin 
Stain less steel 316,1 "mal x 1/2" female, NPT
threaded, Insertion length (tip to hexagon shall
be as following table) :
Pipe dia
(in)
2
3
4
6
8
Construction specification
IGS-M-RS-401(1)
Insertion length
(mm)
60
80
100
140
185
Seamless, screwed, API line pipe threaded,
3000 material acc. to ASTM A 105,
Construction standard acc. to ANSI B 16.11
Reference standard
IGS-M-PL-006(1), 1994
33
N.I.G.C.
July 2014
Inspection, test & certification
Description
To be Filled by NIGC
IGS-M-RS-401(1)
To be Filled by
manufacture/supplier
Documents prior to fabrication
Acc. to item 5.1
Yes 
No 
The reports & test results prior to
the shipment
Acc. to item 5.2
Yes 
No 
Strength test (5.3.2)
Required for each station
Yes 
No 
Tightness test (5.3.3)
Required for each station
Yes 
No 
Visual inspection (5.3.1)
Required for each type of station
Yes 
No 
Dimensional checks (5.3.4)
Required for each type of station
Yes 
No 
Material checks (5.3.5)
Test certificates is required
Yes 
No 
Paint test (5.3.6)
Test certificates is required
Yes 
No 
Acc. to item (5.3.7)
Yes 
No 
Acc. to item (5.4)
Yes 
No 
Quality assurance
Inspection & certificates
Manufacturer signaturer and stamp:
34
N.I.G.C.
July 2014
To be Filled by NIGC
To be Filled by
Manufacture/Supplier
Painting
Acc. to section 6
Yes 
No 
The name plate(s) and the
written information
Acc. to section 7
Yes 
No 
Packing and packaging of the
Instrumentations and Cabinet
station
Acc. to section 8
Yes 
No 
The documentation at
technical quotation stage
Acc. to item 9.1
Yes 
No 
The documentation after
receipt of order
Acc. to item 9.2
Yes 
No 
Documentation
Packing
&
Packaging
Painting
Description
Marking
Item
IGS-M-RS-401(1)
Manufacturer signature and stamp:
35
N.I.G.C.
Item
July 2014
To be Filled by
NIGC
Description
Manuals Spare Parts
Recommended spare part lists for station
Guarantee
IGS-M-RS-401(1)
Is required with
quotation
To be Filled by
Manufacture/Supplier
Yes 
No 
Is required after
order (with price)
Yes 
No 
Manuals installation, operation and
maintenance
Is required
Yes 
No 
Guarantee according to section 10
Is required for each
station
Yes 
No 
Without price
Manufacturer Signature and Stamp:
36
N.I.G.C.
July 2014
37
IGS-M-RS-401(1)
N.I.G.C.
July 2014
38
IGS-M-RS-401(1)
N.I.G.C.
July 2014
39
IGS-M-RS-401(1)
N.I.G.C.
July 2014
40
IGS-M-RS-401(1)
N.I.G.C.
July 2014
41
IGS-M-RS-401(1)
N.I.G.C.
July 2014
42
IGS-M-RS-401(1)