1、BS 6400-2:2006Specification for installation, exchange, relocation and removal of gas meters with a maximum capacity not exceeding 6 m3/h Part 2: Medium pressure (2nd family gases)ICS 91.149.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDIncluding Corrigendum
2、 No. 1Publishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2006ISBN 0 580 48993 0The following BSI references relate to the work on this standard:Committee reference GSE/30Draft for comment 05/30086662 DCPublication
3、historyFirst published July 2006Amendments issued since publicationAmd. no. Date Text affectedBS 6400-2:200616716 31 October 2006 Value corrected in Table 1Corrigendum No. 1 BSI 2006 iBS 6400-2:2006ContentsForeword iii1 Scope 12 Normative references 13 Terms and definitions 24 Planning and exchange
4、of information 75 Competency 86 Design 97 Gas transporters appraisal of a primary meter installation 278 Fitting a meter installation 279 Testing, purging and commissioning of the regulator assembly 3410 Fitting, testing and purging the meter 3411 Commissioning of the meter installation 3612 Notices
5、 3713 Meter exchange and/or replacement of other gas fittings 4114 Meter relocation 4215 Meter removal 4416 Records 4517 Post installation checks 45AnnexesAnnex A (normative) Sizing of meters 46Annex B (normative) Operating pressure limits 47Annex C (normative) Testing, purging and commissioning of
6、the regulator assembly 48Bibliography 55List of figuresFigure 1 Arrangement of a MP meter installation and options for the arrangement of the pressure control and protection system 10Figure 2 MP meter regulators 17Figure 3 Typical domestic meters 20Figure 4 Connections on 6 m3/h metal case meter 21F
7、igure 5 Connections on 6 m3/h plastic case meters intended for semi-concealed installation 22Figure 6 Typical meter boxes 26Figure 7 Typical MP meter installations 28Figure 8 Typical meter installation notices 40Figure C.1 Typical arrangement of test and purge apparatus 54BS 6400-2:2006ii BSI 2006Li
8、st of tablesTable 1 Minimum proximity distances for meter boxes and relief valve vent pipe tips 26Table 2 Appliance gas flow rates for checking meter regulator performance 37Table A.1 Diversity factors of appliances for meter sizing 46Table B.1 Operating pressure limits for meter installation pressu
9、re control and protection system 47Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 57 and a back cover. BSI 2006 iiiBS 6400-2:2006ForewordPublishing informationThis British Standard was published by BSI and came into effect on 31 July 2006. It
10、was prepared by Technical Committee GSE/30, Gas installations (1st, 2nd and 3rd family gases). A list of organizations represented on this committee can be obtained on request to its secretary.The Technical Committee wishes to acknowledge the Institution of Gas Engineers and Managers for permission
11、to use certain tables and figures from its publication IGE/TD/15 1. SupersessionThis part of BS 6400 partially supersedes BS 6400:1997, which will be withdrawn upon publication of all three parts of BS 6400.Relationship with other publicationsThis standard is issued in three parts: Part 1: Low press
12、ure (2nd family gases); Part 2: Medium pressure (2nd family gases); Part 3: Low and medium pressure (3rd family gases).Terminology within this part might not necessarily be consistent with BS 6400-3, which uses terminology that is consistent with the liquefied petroleum gas industry.This standard ha
13、s been prepared as a supporting document to COP/1c 2, the Ofgas code of practice for all higher pressure and all other low pressure (LP) meter installations not covered by COP/1a 3 or COP/1b 4.Information about this documentThis new edition represents a full revision of BS 6400:1997, and: uses more
14、up-to-date gas industry terminology; reflects changes in structure, practices and product availability in the gas industry; provides additional information on the installation, exchange, relocation and removal of gas meters with a maximum capacity not exceeding 6 m3/h supplied from medium pressure 2
15、nd family gas networks.Hazard warningsWARNING. This British Standard calls for the use of substances and/or procedures that can be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to healt
16、h and safety at any stage.Use of this documentIt has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced.BS 6400-2:2006iv BSI 2006Presentational conventio
17、nsThe provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative
18、 element.Contractual and legal considerationsAttention is drawn to the following statutory regulations.a) The Gas Safety (Installation and Use) Regulations 1998 5.b) The Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004 6.c) The Gas Safety (Application) Order (Isle of Man) 1996 7
19、.d) The Gas Meters (Information and Connection and Disconnection) Regulations 1996 8.e) The Gas Safety (Management) Regulations 1996 9.f) The Gas Safety (Management) Regulations (Northern Ireland) 1997 10.g) The Gas (Meters) Regulations 1983 (as amended) 11.h) The Building Regulations 2000 (as amend
20、ed) 12.i) The Building (Scotland) Regulations 2004 (as amended) 13.j) The Building Regulations (Northern Ireland) 2000 (as amended) 14.k) The Measuring Instruments (EEC Requirements) (Gas Volume Meters) Regulations 1988 (as amended) 15.This publication does not purport to include all the necessary p
21、rovisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations. BSI 2006 1BS 6400-2:20061 ScopeThis standard specifies requirements for the installation, exchange, relocation and removal of credi
22、t or prepayment diaphragm and ultrasonic gas meters with a maximum capacity not exceeding 6 m/h. NOTE 1 For the purposes of this standard, installation includes design, inspection and commissioning. It is recognized that each of these tasks can be performed by the same person.This part of BS 6400 is
23、 applicable to primary meter installations:a) supplied with 2nd family gases from medium pressure gas distribution systems with a maximum operating pressure exceeding 75 mbar but not exceeding 2 bar and with a design maximum incidental pressure of 2.7 bar;b) only fitted downstream of the emergency c
24、ontrol valve;c) that utilize a pressure control and protection system contained within a regulator assembly that is downstream of the emergency control valve;d) where all gas fittings subjected to medium pressure have been pre-assembled and where strength and gas tightness testing has been undertake
25、n on the regulator assembly at the factory;e) where the operating pressure at the outlet of the meter is nominally 21 mbar.NOTE 2 Medium pressure gas networks in Great Britain operate with maximum operating pressure in the range of 75 mbar or greater but not exceeding 2 bar with a design maximum inc
26、idental pressure of 2.7 bar.Installation, exchange, relocation and removal of a secondary meter with a maximum capacity of 6 m/h is specified in BS 6400-1.Installation pipework is specified in BS 6891.Service pipes (including the emergency control valve) are specified in the Institution of Gas Engin
27、eers and Managers publication on gas services, IGE/TD/4 16.NOTE 3 All pressures quoted in this standard are gauge pressures and all pressure absorption values are for natural gas unless otherwise specified.NOTE 4 Additional guidance on domestic gas systems can be found in the European functional sta
28、ndards BS EN 1775 and BS EN 12279.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) ap
29、plies.BS 21, Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions)BS 476-7:1997, Fire tests on building materials and structures Part 7: Method of test to determine the classification of the surface spread of flame of productsBS
30、 6400-2:20062 BSI 2006BS 746:2005, Fittings for installation of low pressure gas meters Requirements and test methodsBS 6891:2005, Installation of low pressure gas pipework of up to 35 mm (R1) in domestic premises SpecificationBS 6400-1, Specification for installation, exchange, relocation and remov
31、al of gas meters with a maximum capacity not exceeding 6 m3/h Part 1: Low pressure (2nd family gases)BS 7372, Guide to choice of aperture size and wire diameter combinations for industrial wire screens and woven wire clothBS 7671, Requirements for electrical installations IEE Wiring Regulations.BS E
32、N 1057, Copper and copper alloys Seamless, round copper tubes for water and gas in sanitary and heating applicationsBS EN 1359:1999, Gas meters Diaphragm gas metersBS EN 60070-10, Electrical apparatus for explosive gas atmospheres Part 10: Classification of hazardous areasBS EN ISO 10806, Pipework F
33、ittings for corrugated metal hosesDD ENV 14236, Ultrasonic domestic gas metersDEPARTMENT OF TRADE AND INDUSTRY. Gas Suppliers Licence: Standard Conditions, 2001.INSTITUTION OF GAS ENGINEERS AND MANAGERS. IGE/UP/1, Strength testing, tightness testing and direct purging of industrial and commercial ga
34、s installations, 2003.INSTITUTION OF GAS ENGINEERS AND MANAGERS. IGE/UP/1B, Tightness testing and purging of domestic sized Natural Gas installations, 2006.INSTITUTION OF GAS ENGINEERS AND MANAGERS. PRS 3/E, Meter regulators for gas flow rates not exceeding 6 m3/h and inlet pressures less than 75 mb
35、ar, 2004.INSTITUTION OF GAS ENGINEERS AND MANAGERS. PRS 6/E, Semi-rigid and flexible meter connectors, 2004.INSTITUTION OF GAS ENGINEERS AND MANAGERS. PRS 28/E, Specification for medium pressure single-stage regulators for gas flow rates not exceeding 6 m3/h, 2006.INSTITUTION OF GAS ENGINEERS AND MA
36、NAGERS. PRS 29/E, Specification for medium pressure two-stage regulators for gas flow rates not exceeding 6 m3/h, 2006.3 Terms and definitionsFor the purposes of this British Standard, the following terms and definitions apply.3.1 additional emergency control valve (AECV) valve, not being the emerge
37、ncy control valve, for shutting off the supply of gas in an emergency, intended for use by a consumer of gas BSI 2006 3BS 6400-2:2006NOTE An AECV may be located within either the meter installation or installation pipework and, as such, may not isolate all the consumers pipework or meter installatio
38、n.3.2 design maximum incidental pressure (DMIP)maximum pressure that a system is permitted to experience under fault conditions, limited by safety devices, when the system is operated at the design pressureNOTE In the case of a medium pressure gas network in Great Britain the DMIP is 2.7 bar.3.3 des
39、ign minimum pressure (DMP)minimum pressure that can occur at the end of any service pipe at the time of system design flow rate under extreme gas supply and maintenance conditionsNOTE 1 The DMP of a medium pressure gas network in Great Britain can be obtained from the gas transporter.NOTE 2 In the c
40、ase of a meter installation the system design flow rate is the maximum capacity of the meter installation.NOTE 3 An extreme gas supply condition is considered to be a severe winter of the type that occurs one year in twenty.3.4 design pressure (DP)pressure on which design calculations are basedNOTE
41、In the case of medium pressure gas networks in Great Britain the DP is 2 bar.3.5 electrical insulatorgas fitting, with a high electrical resistance, to minimize the flow of any stray electrical current3.6 emergency control valve (ECV)valve for shutting off the supply of gas in an emergency, which is
42、 intended for use by a consumer of gas and is installed at the end of a service3.7 equipotential bondelectrical connection maintaining various conductive parts at substantially the same electrical potential3.8 excess flow valvedevice that automatically shuts off or restricts the flow of gas should i
43、t exceed a predetermined rateNOTE The excess flow valve referred to in this standard is that which is incorporated in the meter regulator.3.9 filterdevice fitted upstream of the meter regulator to capture particles in the gas stream3.10 gas fittingpipework, valve, regulator, meter, fitting, apparatu
44、s or appliance3.11 indexseries of dials or rows of figures indicating the volume of gas that has passed through the meterBS 6400-2:20064 BSI 20063.12 installation pipeworkpipework or fitting from the outlet of the primary meter installation to points at which appliances are to be connectedNOTE This
45、definition varies from that given in regulation 2 of the Gas Safety (Installation and Use) Regulations 1998 5.3.13 interconnecting pipeworkpipework assembled within the meter installation3.14 lock-up pressureoutlet pressure of the regulator at which it shuts off completely3.15 low pressure (LP)gas s
46、upply with a maximum operating pressure of 75 mbar3.16 lowest operating pressure (LOP)lowest pressure at which a system can be operated under normal operating conditionsNOTE The gas transporter will be able to advise on the LOP of the gas supply.3.17 maximum operating pressure (MOP)maximum pressure
47、at which a system can be operated continuously under normal operating conditionsNOTE The gas transporter will be able to advise on the MOP of the gas supply.3.18 medium pressure (MP)gas supply at the outlet of the emergency control valve with a design minimum pressure exceeding 75 mbar and a maximum
48、 operating pressure that does not exceed 2 bar3.19 meterinstrument designed to measure, memorize and display the quantity of gas that has passed through it3.19.1 credit metermeter in which the volume registered by the index is the basis of a periodic account rendered to the consumer3.19.2 diaphragm
49、meterpositive displacement meter in which the measuring chambers have deformable walls3.19.3 positive displacement metermeter that directly measures the volume of gas that passes through itNOTE An example of a positive displacement meter is a diaphragm gas meter.3.19.4 prepayment metermeter fitted with a mechanism that, on the insertion of a coin, mechanical token or smartcard, permits the passage of a predetermined volume of gas3.19.5 prima
