Approved - TehranGas CO

IGS-M-RS-401(1) July 2014

Approved ��ب

شركت ملي گازايران

.

IGSمديريت پژوهشو فنĤوري

امورتدوين استانداردها

مشخصات فني خريد

ايستگاههاي تقليل فشار / اندازه گيري نوع كابينتي باحداكثرظرفيت 10،000

مترمكعب استاندارد برساعت

Specification for Measuring/ Reducing and Measuring Cabinet Type Stations with Max. Capacity up to 10,000

SCM/H

Fax:(9821)-8131-5679 4Mاي اR@A;دD ازاA@;?<ارده; D>E4F@G: 6HI? JC4KL 6M NOP درBC;A اA@;?<ارده; :4ا678 45دد

http://igs.nigc.ir [email protected]

N.I.G.C. July 2014 IGS-M-RS-401(1)

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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: [email protected]


II

امور تدوين استانداردها پيشگفتار

.دستورالعمل به منظور استفاده خصوصي در شركت ملي گاز ايران و شركتهاي فرعي وابسته تهيه شده است / اين استاندارد -1

و در مورد نيازهاي اختصاصي از استانداردهاي (IPS)شركت ملي گاز ايران در مورد نيازهاي عمومي از استانداردهاي وزارت نفت -2 .استفاده مي نمايد (IGS)ختصاصي خود ا

هــــاي تخصصــــي اســــتاندارد متشــــكل از كارشناســــان توســــط كميتــــه (IGS)اســــتانداردهاي شــــركت ملــــي گــــازايران -3بـه تصـويب ) منتخب هيئت مديره شركت ملي گـاز ايـران ( بخش هاي مختلف و يا مشاور تهيه مي شود و توسط شوراي استاندارد

.مي رسند

تخصصي مربوط بـه صـنايع گـاز دنيـا، –از كليه منابع شناخته شده استانداردي ، اطلاعات فني (IGS)تانداردهاي در تنظيم متن اس -4مشخصات فني توليدات سازندگان معتبر جهاني و نيز از نتيجه تحقيقات و تجربيات كارشناسان و متخصصان داخلي برحسب مـورد

چه بيشتر از توليدات داخلي قابليت هاي سازندگان داخلي نيز مـورد توجـه قـرار همچنين به منظور استفاده ازهر . استفاده مي شود .مي گيرد

در اختيـــار واحـــدها و كـــاربران قـــرار (CD)و يـــا لـــوح فشـــرده * اســـتانداردها از طريـــق پايگـــاه اينترنتـــي شـــركت -5 .مي گيرد

بنـابراين . بازنگري و بروز رساني قرار ميگيرنـد سال يكبار و يا در صورت ضرورت زودتر ، مورد 5استانداردها به طور متوسط هر -6 .كاربران بايد هميشه آخرين نگارش را مورد استفاده قرار دهند

هر گونه نظر و يا پيشنهاد اصلاح در مورد استانداردها مورد استقبال و بررسي قرار خواهـد گرفـت و در صـورت تائيـد ، اسـتاندارد -7 .گرفت مروبوطه نيز مورد تجديد نظر قرار خواهد

تعاريف عمومي .از تعاريف و اصطلاحات زير استفاده مي شود (IGS)در متن استانداردهاي

.و يا شركتهاي فرعي وابسته مي باشد "شركت ملي گاز ايران "منظور از شركت : (COMPANY) "شركت" -1

ا نسـبت بـه شـركت تقبـل نمـوده به فرد يا موسسه اي اطلاق مي گردد كه تعهدي ر: (PUPPLIER / VENDOR) "فروشنده " -2 .است

و يـــا شـــركتهاي فرعـــي وابســـته "شـــركت ملـــي گـــاز ايـــران "منظـــور از خريـــدار : (PURCHASER) "خريـــدار " -3 .مي باشد

4- "SHALL" :در مواردي بكاربرده مي شود كه انجام خواسته مورد نظر اجباري است.

5- "SHOULD" :ورد نظر ترجيحي و در عين حال اختياري است در مواردي بكاربرده مي شود كه انجام خواسته م.

6- "MAY" :شود كه انجام كار به شكل مورد بحث نيز قابل قبول مي باشد در مواردي بكار برده مي.

آدرس اينترنتي * (http://igs.nigc.ir)آدرس الكترونيكي ،([email protected])


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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 – عالي محيط زيستمصوبه شوراي 21

APPENDIX B – Data Sheet 22

APPENDIX C – Typical Arrangement of Cabinet Type Station 37


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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 High-Temperature 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"


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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"


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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.


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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.


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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.


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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.


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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.


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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)

1 Metering

3-4(45-60) 3-4(45-60)

400.1

400.2

1000

2500

4000

10-17.2(150-250) 10-17.2(150-250)

1000

2500

5000

10000

2 Reducing &

Metering 10 -17.2(150-250) 3-4(45-60)

400.1

400.2

1000

2500

5000

10000


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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.


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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.


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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.


13

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.


14

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.


15

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).


16

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.


17

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


18

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.


19

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;


20

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.


21

APPENDIX "A"

)21/3/1381مصوب ( شوراي عالي حفاظت محيط زيست 236به شماره مصو

هيـأت وزيـران 19/3/1378آيين نامه اجرايي نحوه جلوگيري از آلـودگي صـوتي مصـوب جلسـه مـورخ 2در اجراي ماده د اجـرا مـور شود كه از تاريخ تصويب در سطح كشور به حدود مجاز صدا در هواي آزاد ايران بشرح ذيل تعيين و موافقت مي

.گذارده شود

شب 10صبح الي 7روز نوع منطقه رديف

(A) Leq (30) db صبح 7شب الي 10شب

(A) Leq (30) db

45 55 منطقه مسكوني 1 50 60 مسكوني–منطقه تجاري 2 55 65 منطقه تجاري 3 60 70 صنعتي–منطقه مسكوني 4 65 75 منطقه صنعتي 5

A (A) Leq (30) db و واحد آن دي سي بل استمي باشد گيري در شبكه وزني دقيقه اندازه 30تراز معادل در مدت زمان. علاوه بـر شـبكه (درصد آن داراي كاربري مسكوني خالص باشد و بقيه آن 50اي است كه بيش از محدوده: منطقه مسكوني

. اشدشامل خدمات مربوط به مسكوني و بدون مزاحمت براي مسكوني ب) معابر ) هاي پايين، تجاري در حد روزمره، فرهنگي روزمره آموزشي رده(


22

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 Supplier

Item

Inquiry Data Offered Data

Indent item No.

Inlet pressure bar (psig)

Outlet pressure bar (psig)

Maximum capacity (scm/h)

Item No.

Inlet pressure bar (psig)

Outlet pressure bar (psig)

Maximum capacity (scm/h)

Manufacturer signature and stamp :


23

To be Filled by Manufacturer/Supplier

To be Filled by NIGC Description Item

----- -10 0C to 55 0C (+14 0F to 131 0F) Gas temperature

Gen

eral

Yes No -29 0C to 60 0C (-20 0F to 140 0F) Ambient temperature

Yes No …………… Max. relative humidity

Residential

Commercial - Residential

Commercial

Residential – Industrial

Industrial

Station location

Yes No According to Appendix A Maximum noise level limitation

Manufacturer signature and stamp :


24



……… Manufacturer

Plu

g V

alve

Yes No Pressure balance Type Yes No Standard type Yes No Lubricated Yes No Wrench operated 150 300 150 300 Class rating

……….. Size (in) Yes No 1.5 M.A.W.P Hydrostatic test pressure

Yes No API 6D

and IGS-M-PL-002-1

References standard including design, fabrication, material, testing, etc

Yes No API 607

or API 6FA

Fire safe

Yes No Cast carbon steel at least acc to ASTM A 216 grade

WCB/WCC

Body, bonnet, cover, plug, ends

Yes No Forged carbon steel at least

acc. to ASTM A 105

Yes No Cast carbon steel at least acc to ASTM A 216 grade

WCB/WCC

Plug

Yes No Forged carbon steel at least

acc. to ASTM A 105

Yes No acc. to ASTM D 2004 , HK

710 or ASTM D 145 Non-metallic parts

Yes No Flanged end R.F, S.F* Connection Yes No acc. to ANSI B16.5 Yes No Anti-blow out stem Stem design Yes No -29 °C to 60 °C Operating temperature range Yes No Yes Anti static design Yes No Yes Sealant injection

Yes No

Special treatment, electroless nickel plated

with minimum 25 μm thickness as per

ASTM B 656

Plug surface

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

Additional request

*:Serrated finished Manufacturer signature and stamp:


25

Item Description To be Filled by NIGC To be Filled by

Manufacturer/Supplier

Bal

l Val

ve

Manufacturer ………

Type Full bore, split body, trunnion mounted

Yes No

Class rating 150 300 150 300 Size (in) ….. Hydrostatic test pressure 1.5 M.A.W.P Yes No References standard including design, fabrication, material, testing, etc

API 6D and

IGS-M-PL-010-1,2 Yes No

Fire safe API 607 or

API 6FA Yes No

Body, bonnet, cover, ends Cast carbon steel at least acc to ASTM A 216 grade

WCB/WCC Yes No

Forged carbon steel at least acc. to ASTM A 105

Yes No

Ball Cast carbon steel at least acc to ASTM A 216 grade

WCB/WCC Yes No

Forged carbon steel at least acc. to ASTM A 105

Yes No

Connection Flanged ends R.F, S.F* Yes No acc. to ANSI B16.5 Yes No

Stem design Anti-blow out stem Yes No Anti static design Yes Yes No Ball surface 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

Stem Forged carbon steel at least acc. to ASTM A 105

or BS 1503 Grade 221/550 Yes No

Bar alloy steel at least acc. to AISI 4140

Yes No

Stem surface Electro less nickel plated Yes No Hard chromium plated Yes No

Additional request Manufacturer catalogs including detail sectional drawing, test certificates

acc. to API 6D and IGS-M-PL-002-1

Yes No



26



Reg

ula

tor

Manufacturer ……………

Maximum capacity at minimum inlet pressure and outlet set pressure (scm/h)

min:………. max:……… min:……. max:……

Class rating 300 Size (in) Gas inlet pressure (psig) min:………. max:……… min:……. max:…… Maximum operating pressure 250 psig (17.2 bar) Yes No Set pressure (psig) 60 psig (4.2 bar) Yes No Lock-up pressure at maximum inlet pressure (psi)

…………… Yes No

Design pressure 720 psig (50 bar) Yes No Test pressure 1080 psig (74 bar) Yes No Type Axial Yes No

Conventional pilot operated Yes No Conventional spring loaded Yes No

Other Yes No Fail safe design Regulator fail to open Yes No

Regulator fail to close Yes No Safety shut-off valve type Slam type Yes No Safety shut-off valve pressure 72 psig (5 bar) Yes No Noise reduction device Light metal or equivalent Yes No Connection type Flanged ends R.F, S.F* Yes No

acc. to ANSI B16.5 Yes No Valve body material Carbon steel acc. to ASTM A 216

grade WCB Yes No

Forged carbon steel acc. to ASTM A 105

Yes No

Seamless pipe acc. to API Suitable for -29 °C to 60 °C ambient temperature

Yes No

Internal metallic parts material Corrosion resistant material such as S.S

Yes No

Corrosion resistant plated steel Yes No Valve mechanism material S.S type 316 Yes No Pilot body material Carbon steel acc. to ASTM A 216

grade WCB Yes No

Forged carbon steel acc. to ASTM A 105

Yes No

Die cast aluminum acc. to ASTM B 85

Yes No

Brass acc. to ASTM B 283 grade C 37700

Yes No

Internal non-metallic parts Rubber or plastic material resistant to odorized natural gas

Yes No

Sensing line material S.S type 316 Yes No Pilot type/model …………… Pilot spring range (barg) …………… Pilot setting (barg) …………… Optional accessory Filter Others Reference standard IGS-M-IN-202(0): 2009

Yes Yes No



27



Dry

Gas

Fil

ter


Installation Horizontal

Horizontal Vertical

Class rating 150 300 150 300 Inlet/outlet connection Flanged ends R.F, S.F* Yes No

acc. to ANSI B16.5 Yes No Flange material ASTM A 105 Yes No

Design pressure 1.1 *M.W.P Yes No Test pressure 1.3 *Design pressure Yes No

Inlet pressure range (psig) 45-60 psig (3-4 bar) Yes No 150-250 psig (10-17.2 bar) Yes No

Maximum capacity (scm/h) …………… …………… Construction standard ASME sec, VIII, Div.1 Yes No

ASME "U" stamped Yes No Yes No

Body material ASTM A 106 grade B Yes No

Head and hub Forged acc. to ASTM A 105 Yes No

Corrosion allowance 1.6 mm Yes No

Type of closure Quick opening closure with safety bleed inter lock

Yes No

The documentation for calculation of filtration area

is required Yes No

The documentation for calculation design pressure vessel

is required Yes No

Drain valve Tow Lubricated plug valve, flange ends

Yes No

Other characteristics of dry gas filter acc. to IGS-M-PM-105

Yes Yes No



28



Dry

Gas

Fil

ter

Car

trid

ge

Flow direction OUT to IN Yes No

Material of media 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

Ref- standard for cartridge IGS-M-PM-111 Yes No

Manufacturer signature and stamp:


29

Item Description To be filled by NIGC To be filled by


Tu

rbin

e M

eter


Gas inlet pressure (bar/psig) min:………. max:……… min:………. max:……… Ambient temperature range -29 °C to 60 °C Yes No Gas temperature range -10 °C to 55 °C Yes No Flow straightner Is required (built in) Yes No Capacity with air at atmospheric conditions (±100 mbar) at maximum pressure loss(CMH)

…………… Yes No

Meter mounting Horizontal Yes No Size (in) ……….. ……….. Class rating Class 150

Class 300 Class 150 Class 300

Test pressure (psig) 412 psig (28 bar) for class 150 1080 psig (75 bar) for class 300

412 psig (28 bar) for class 150 1080 psig (75 bar) for class 300

Length (F to F) (mm) 3D Yes No Minimum up stream length according manufacturer recommendation (mm)

……………

Minimum downstream length according manufacturer recommendation (mm)

……………

Connection type Flanged ends R.F, serrated finished acc. to ANSI B16.5

Yes No

Ind

ex

Type Direct reading, digital Yes No Transmission system Magnetic coupling Yes No

Frequency pulse generator

LF and HF Yes No

Measuring unit CMH Index case Dust & hummidity proof (IP 65) Yes No

Co

rrec

tin

g D

evic

e Type Volume corrector Yes No

Standard IGS-M-IN-106 …………………. Manufacturer ………………… Model NO. ………………… The compatibility of correction device with turbine meter

Shall be approved by the manufacturer of turbine meter

Yes No

Mat

eria

l

Body Carbon steel acc. to ASTM A216 grade WCB/WCC,

or Forged carbon steel acc. to

ASTM A 105

……………

Bearing Stainless steel type 316 ……………

Turbine wheel Aluminium acc. to ISO 6012 ……………

Shaft Stainless steel type 316 ……………

Gearing Stainless ……………

Flange Forged carbon steel acc. to ASTM A 105

……………



30

Item Description To be filled by NIGC To be filled by


Tu

rbin

e M

eter

Des

ign

Co

nd

itio

n

Range ability 20:1 Yes No

30:1 Yes No

50:1 Yes No

Maximum permissible errors Qmin ≤ Q < Qt : ±2% Yes No

Qt ≤ Q ≤ Qmax : ±1% Yes No

Transitional flow rate Qt 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

Ro

uti

ne

T

est

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

Typ

e T

est

Type tests certificate issued by a national standard organization

Required for each type of meter (size/class)

Yes No

Body strength test 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

mai

nte

nan

ce

Bearing lubrication Self lubricated for 2"/150 and 3"/150

Yes No

Lubricated by oil pump Yes No

Special lubricating tools Required Not required

Yes No

Oil specification ------------------

The approval certification of meters manufacturer certify by national bureau standard

Is required Submitted

Not submitted

Guarantee 18 months after shipment or 12 month after installation

Yes No

Reference standard

IGS –M-IN-102 latest edition Yes Yes No



31



Gas

Vo

lum

e C

on

vers

ion

Dev

ice

Conversion device kind PTZ T PT PTZ

Conversion device type Type 1 Type 2 Type 1 Type 2

Database interfaces Optical RS-232 RS-485

Optical RS-232 RS-485

Body material Corrosion resistance and UV protection

corrosion resistance UV protection

Volume measuring unit Standard cubic meter per hour

Yes No

Ingress protection (IP) IP 65 Yes No

Power supply Battery � AC � DC �

Battery AC DC

Battery life time At least 5 years Certificate ATEX approval �

EN approval � MID approval �

ATEX approval � EN approval � MID approval �

Maximum permissible error 1% (at rated operating condition)

Yes No o.5%

(at reference condition) Ability to correct the error of the gas meter Yes No Yes No

Ability to adjust and correct the error of temperature and pressure sensors parameters

Yes No Yes No

Ambient temperature Normal range: -29 °C to +60 °C �

Special range:

-40 °C to +60 °C �

Yes No

Standard modbus protocol support Yes No Yes No

Capacity of memory for archive minimum 5900 record acc. to EN 12405

Yes No Yes No

Operating pressure ranges (bar/psig) from……..… to ………… from……… to ………

Guaranty/warranty 5 years guaranty and 15 years warranty

Yes No

Reference standard IGS-M-IN-106 Yes No



32

To be Filled by manufacturer/supplier


Yes No Spring located Type

Rel

ief

valv

e

Yes No Semi Nozzle Yes No CL 150 Class rating Yes No 19 bar (275 psig) for ANSI CL 150 Design pressure Yes No 28.4 bar (412psig) for ANSI CL 150 Test pressure Yes No 4.6 bar(66 psig) Set pressure Yes No (3.8-5.2)bar(55-57 psig) Spring range Yes No -29 ºC to + 60 ºC Ambient temperature

Yes No (2-3) % of max. capacity of station Maximum relief capacity

Yes No Carbon steel acc. to ASTM A 216 grade WCB or forged carbon

street acc. to ASTM A 105 Body

Yes No Stainless steel type 316 Nozzle Yes No Stainless steel type 316 Seat disc Yes No Stainless steel type 316 Disc holder Yes No Acc. to IGS-M-IN-302 Other characteristic of relief vale

Yes No Is required

Minimum required original technical catalogue and document including: -Manufacture name, trade mark -Type model number -Reference standard for design, material fabrication and testing

Yes No Is required Drawing showing outline dimension

Yes No Is required after order Capacity table and relate calculations

Yes No Sch.40, acc. to API 5L grade B or ASTM A 53 grade B or

ASTM A 106 grade B Pipe

Pip

es ,

fit

tin

gs,

…..

Yes No W.N,R,F,S.F as per ASTM A 105 and ANSI B 16.5 Flange Yes No Seamless acc. to IGS-PL-022(0), part 1 Butt welding ends fitting

Yes No Seamless, NPT, threads as API 5B or ANSI B 1.20.1 class

rating 3000 Ib material acc. to pipe material Nipple

Yes No Seamless, butt-weld, material acc. to ASTM A 105 class rating

3000 lb, as per related MESC Weldolet

Yes No 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

Threadolet

Yes No Acc. to PLD-107 (Rev.1) Stud bolts and nuts

Yes No 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)

Gasket

Yes No Thickness 0.175 inch Yes No Construction & testing acc. to IGS-MS-PL-005,1993 Yes No Design, dimensions, marking acc. to BS 3381

Yes No Material strip ANSI 316 stainless steel with oil resistant graphic

compound filler Yes No Material guide ring carbon steel with thickness 1/8 inch Yes No Class 150 Class 300 Yes No Related flanges RF, S.F acc. to ANSI B16.5

Yes No

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.

Stud coupling

Yes No Construction & testing acc. to IGS-M-PL-005, 1993 Sensing line Yes No Construction specification acc. to IGS-PL-003(2), 1994 Gauge needle valve Yes No Construction standard specification acc. to IGS-PL-018(0), 1992 Electrode

Manufacturer signaturer and stamp:


33



Yes No Bourdon tube Type

Pre

ssu

re g

au

ge

Yes No For outdoor installation at metering/metering &

reducing station Application

Yes No -29 ºC to 60 ºC Ambient temperature

Yes No 1/2 (in), NPT, male, bottom, complete with

hexagon, square or two flat on the shank with minimum thickness 12 mm

Connection

Yes No Direct Mounting Yes No 100 (4) Dial size : mm (in) Yes No 0-6 (0-100) Dial range : bar (psig) Yes No 0-25 (0-400)

Yes No Acc. to BS 1780 Scale, marking, graduation and testing

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)

Accuracy

Yes No Dual bar & psig Scale graduation

Yes No Aluminum alloy, white enameled with black

figures Dial

Yes No Weather proof, material shall be 316 stain less

steel Case

Yes No 316 stainless steel Movement, bourdon tube and stem material

Yes No Byonet type or threaded material, 304 stainless

steel Bezel ring

Yes No Adjustable micrometer type aluminum or steel,

black color Pointer

Yes No Shatter-proof Glass Yes No Blow out disc Over pressure protection Yes No Silicon oil Glycerin Damping liquid

Yes No Is required Adjustment screws for range and linearity calibration

Yes No Easily accessible All internal parts

Yes No

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)

Insertion length (mm)

2 60 3 80 4 100 6 140 8 185

Thermo well(for the meters unintegrated with thermo well)

Yes No Seamless, screwed, API line pipe threaded,

3000 material acc. to ASTM A 105, Construction standard acc. to ANSI B 16.11

Construction specification

Yes No IGS-M-PL-006(1), 1994

Reference standard

Insu

lati

ng

j

oin

t


34

Insp

ecti

on

, tes

t &

cer

tifi

cati

on

Description To be Filled by NIGC 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

Quality assurance Acc. to item (5.3.7) Yes No

Inspection & certificates Acc. to item (5.4) Yes No

Manufacturer signaturer and stamp:


35


Manufacture/Supplier

Pai

nti

ng

Painting Acc. to section 6 Yes No

Mar

kin

g

The name plate(s) and the written information

Acc. to section 7 Yes No

Pac

kin

g

&

Pac

kag

ing

Packing and packaging of the Instrumentations and Cabinet station

Acc. to section 8 Yes No

Do

cum

enta

tio

n

The documentation at technical quotation stage


The documentation after receipt of order




36

Item Description To be Filled by

NIGC To be Filled by

Manufacture/Supplier

Man

ual

s S

par

e P

arts

Recommended spare part lists for station Is required with quotation

Without price

Yes No

Is required after order (with price)

Yes No

Manuals installation, operation and maintenance

Is required Yes No

Gu

aran

tee

Guarantee according to section 10 Is required for each station

Yes No

Manufacturer Signature and Stamp:


37


38


39


40


41


42