1、BS 6400-3:2007Specification for installation, exchange, relocation and removal of gas meters with a maximum capacity not exceeding 6 m3/h Part 3: Low and medium pressure (3rd family gases)ICS 91.140.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing an
2、d copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007ISBN 978 0 580 53714 1The following BSI references relate to the work on this standard:Committee reference GSE/30Draft for comment 06/30086669 DCPublication historyFirst pu
3、blished November 2007Amendments issued since publicationAmd. no. Date Text affectedBS 6400-3:2007 BSI 2007 iBS 6400-3:2007ContentsForeword iii1 Scope 12 Normative references 23 Terms and definitions 24 Planning and exchange of information 65 Competency 76 Design 77 Installation 218 Gas tightness tes
4、ting and purging 259 Commissioning of the meter installation 2610 Notices 2711 Meter exchange and/or replacement of other gas fitting 3012 Meter relocation 3013 Meter removal 3214 Records 3315 Post installation checks 33AnnexesAnnex A (normative) Sizing of meters 34Annex B (normative) Operational pr
5、essure limits 35Bibliography 37List of figuresFigure 1 Arrangements of a meter installation (symbols to BS 1553-1) 9Figure 2 Connections on 6 m3/h metal case meter 16Figure 3 Connections on 6 m3/h plastic case meters intended for semi-concealed installation 17Figure 4 Typical meter installation noti
6、ces 29List of tablesTable 1 Minimum proximity distances for meter housings and relief valve vent pipe tips (MP installations) 14Table A.1 Diversity factors of appliances for meter sizing 34Table B.1 Operational pressure limits for a regulator conforming to BS EN 13785 which supplies MP (sometimes re
7、ferred to as first stage) 35Table B.2 Operational pressure limits for MP regulator conforming to BS EN 13785 which supplies LP (sometimes referred to as the second stage regulator when used in a three stage system) 35Table B.3.1 Operational pressure limits for a MP or LP regulator conforming to BS E
8、N 13785 which supplies the gas appliance where the downstream equipment has a MOP of 150 mbar 36Table B.3.2 Operational pressure limits for a MP or LP regulator which supplies the gas appliance where the downstream equipment has a MOP of 75 mbar 36Summary of pagesThis document comprises a front cove
9、r, an inside front cover, pages i to iv, pages 1 to 38, an inside back cover and a back cover.BS 6400-3:2007ii BSI 2007 This page deliberately left blank BSI 2007 iiiBS 6400-3:2007ForewordPublishing informationThis British Standard is published by BSI and came into effect on 30 November 2007. It was
10、 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.SupersessionThis part of BS 6400, along with parts 1 and 2, supersedes BS 6400:1997, which is withdrawn.Relati
11、onship with other publicationsThe standard is issued in three parts: Part 1: Low pressure (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 6400-1 and BS 6400-2,
12、which uses terminology that is consistent with the natural gas industry.Information about this documentThis new edition represents a full revision of BS 6400:1997, and: uses more up-to-date gas industry terminology; reflects changes in structure, practices and product availability in the gas industr
13、y; provides additional information on the installation, exchange, relocation and removal of gas meters with a maximum capacity not exceeding 6 m3/h supplied from low and medium pressure 3rd family gas systems.Hazard warningsUse of this documentIt has been assumed in the preparation of this British S
14、tandard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in wh
15、ich the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.WARNING. This British Standard calls for the use of substances and/or procedures that can be injurious to health if ad
16、equate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage.BS 6400-3:2007iv BSI 2007Contractual and legal considerationsAttention is drawn to the following statutory regulations.a) The Gas
17、Safety (Installation and Use) Regulations 1998 1.b) The Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004 2.c) The Gas Safety (Application) Order (Isle of Man) 1996 3.d) The Gas Meters (Information on Connection and Disconnection) Regulations 1996 4.e) The Gas Safety (Management)
18、 Regulations 1996 5.f) The Gas Safety (Management) Regulations (Northern Ireland) 1997 6.g) The Gas (Meters) Regulations 1983 (as amended) 7.h) The Building Regulations 2000 (as amended) 8.i) The Building (Scotland) Regulations 2004 (as amended) 9.j) The Building Regulations (Northern Ireland) 2000
19、(as amended) 10. k) The Measuring Instruments (EEC Requirements) (Gas Volume Meters) Regulations 1988 (as amended) 11.l) The Measuring Instruments (Gas Meters) Regulations 2006 12m) The Dangerous Substances and Explosive Atmospheres Regulations 2002 13.This publication does not purport to include al
20、l the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. BSI 2007 1BS 6400-3:20071 ScopeThe standard specifies requirements for the installation, exchange, relocation and removal of c
21、redit 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
22、 is applicable to meter installations:a) supplied with 3rd family gases either:1) from low pressure service pipework with a maximum operating pressure not exceeding 75 mbar and a design maximum incidental pressure of 350 mbar; or2) from medium pressure service pipework with a maximum operating press
23、ure exceeding 75 mbar but not exceeding 2 bar and a design maximum incidental pressure of 2.7 bar;b) only fitted downstream of the emergency control valve;c) that utilizes a meter regulator downstream of the emergency control valve;d) where all gas fittings subjected to medium pressure have been pre
24、-assembled and where strength and gas tightness testing has been undertaken on the regulator assembly at the factory;e) where the operating pressure at the outlet of the meter is nominally 37 mbar.Installation pipework is specified in BS 5482-1 and LPGA Code of Practice 25 14.Service pipework (inclu
25、ding the first emergency control valve) is specified in BS 5482-1 and the LPGA Code of Practice 22 15 and LPGA Code of Practice 25 14.This standard does not cover pressure regulating installations installed in a service pipework upstream of the emergency control valve.NOTE 2 All pressures quoted in
26、this standard are gauge pressures and all pressure absorption values are for liquefied petroleum gas unless otherwise specified.NOTE 3 Additional guidance on domestic gas systems can be found in the European functional standards BS EN 1775.NOTE 4 For additional guidance on the installation of gas me
27、ters in caravan holiday homes, residential park homes and permanently moored boats, reference should be made to IGE/UP/8 16.BS 6400-3:20072 BSI 20072 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the cited ap
28、plies. For undated references, the latest edition of the referenced document (including any amendments) applies.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 stru
29、ctures Part 7: Method of test to determine the classification of the surface spread of flame of productsBS 746:2005, Fittings for installation of low pressure gas meters Requirements and test methodsBS 5482-1, Code of Practice for domestic butane- and propane-gas-burning installations Part 1: Instal
30、lations at permanent dwellings, residential park homes and commercial premises, with installation pipework sizes not exceeding DN 25 for steel and DN 28 for corrugated stainless steel or copperBS 7671, Requirements for electrical installations. IEE Wiring Regulations. Sixteenth editionBS EN 1359, Ga
31、s meters Diaphragm gas metersBS EN 13785, Regulators with a capacity of up to and including 100 kg/h, having a maximum nominal outlet pressure of up to and including 4 bar, other than those covered by EN 12864 and their associated safety devices for butane, propane or their mixturesBS EN 14236, Ultr
32、asonic domestic gas metersBS EN 60079-10, Electrical apparatus for explosive gas atmospheres Part 10: Classification of hazardous areasBS EN ISO 10806, Pipework Fittings for corrugated metal hosesINSTITUTION OF GAS ENGINEERS AND MANAGERS. PRS 6/E, Semi-rigid and flexible meter connectors, 20043 Term
33、s 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 emergency control valve, for shutting off the supply of gas in an emergency, intended for use by a consumer of gasNOTE An AECV may b
34、e located within either the meter installation or installation pipework and, as such, may not isolate all the consumers pipework or meter installation.3.2 equipotential bondelectrical connection maintaining various conductive parts at substantially the same electrical potential BSI 2007 3BS 6400-3:2
35、0073.3 electrical insulatorgas fitting having high electrical resistance, to minimize the flow of any stray electrical current3.4 emergency control valve (ECV)valve for shutting off the supply of gas in an emergency, which is intended for use by a consumer of gas and is installed at the end of the s
36、ervice pipework3.5 gas fittingpipework, valve, regulator, meter, fitting, apparatus or appliance3.6 indexseries of dials or rows of figures indicating the volume of gas that has passed through the meter3.7 installation pipeworkpipework or fitting from the outlet of the meter installation to points a
37、t which appliances are to be connectedNOTE This definition varies from that given in regulation 2 of the Gas Safety (Installation and Use) Regulations 19981.3.8 interconnecting pipeworkpipework assembled within the meter installation3.9 lock-up pressureoutlet pressure of the regulator at which it sh
38、uts off completely3.10 low pressure (LP)gas supply with a maximum operating pressure of 75 mbar3.11 lowest operating pressure (LOP)lowest pressure at which a system can be operated under normal operating conditionsNOTE The gas supplier will be able to advise on the LOP of the gas supply.3.12 maximum
39、 operating pressure (MOP)maximum pressure at which a system can be operated continuously under normal operating conditionsNOTE The gas supplier will be able to advise on the MOP of the gas supply.3.13 design pressure (DP)pressure on which design calculations are basedNOTE The gas supplier will be ab
40、le to advise on the DP of the gas supply.3.14 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 pressure3.15 medium pressure (MP)gas supply at the outlet of t
41、he emergency control valve with a design minimum pressure exceeding 75 mbar and a maximum operating pressure that does not exceed 2 bar3.16 meterinstrument designed to measure, memorize and display the quantity of gas that has passed through itBS 6400-3:20074 BSI 20073.16.1 credit metermeter in whic
42、h the volume registered by the index is the basis of a periodic account rendered to the consumer3.16.2 diaphragm meterpositive displacement meter in which the measuring chambers have deformable walls, e.g. a U6 or G4 gas meter3.16.3 positive displacement metermeter that measures directly the volume
43、of gas passing through itNOTE An example of a positive displacement meter is a diaphragm gas meter3.16.4 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 gas3.16.5 primary metermeter neares
44、t to and downstream of a service pipe or service pipework for ascertaining the volume of gas supplied through that pipe by a supplier3.16.6 semi-concealed metermeter designed and manufactured for use in a semi-concealed meter box3.16.7 ultrasonic metermeter that infers the volume of gas passing thro
45、ugh it by means of the behaviour of an ultrasonic beam3.17 meter boxpurpose-made compartment designed and prefabricated to accommodate a meter installation3.18 meter bracketpurpose made support incorporating a means of securing meter unions from which a meter can be suspended3.19 meter exchangesitua
46、tion where a meter on an existing installation is replaced with another of similar capacity without modification to the associated gas fittings3.20 filterdevice fitted upstream of the meter regulator to capture particles in the gas stream3.21 meter housingarea or room designed and constructed to con
47、tain one or more meters with their associated gas fittingsNOTE The meter housing is not part of the meter installation.3.22 meter inlet valve (MIV)valve fitted upstream of, and adjacent to, a meter to shut off the supply of gas to it BSI 2007 5BS 6400-3:20073.23 meter installationinstallation that c
48、omprises a meter, valves, filter, meter regulator and associated safety devices, pliable connector, interconnecting pipework, fittings and support.NOTE A meter installation commences at the outlet of the ECV. Depending on the type of meter installation it terminates at: the outlet connection of the
49、meter; the outlet of the meter outlet adaptor if fitted; or in the case of a semi-concealed meter with a pliable connector downstream of the meter, the outlet of the meter box outlet adaptor.3.24 non-return valvedevice to prevent the reverse flow of gas, air or other extraneous gas3.25 safety devicedevice which automatically operates in the event of pressure deviations outside pre determined limits3.25.1 over pressure shut off (OPSO)shut off d
