1、BSI Standards PublicationBS 6891:2015Specification for theinstallation and maintenanceof low pressure gasinstallation pipework of upto 35 mm (R114) on premisesPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The Briti
2、sh Standards Institution 2015Published by BSI Standards Limited 2015ISBN 978 0 580 66861 6ICS 91.140.40The following BSI references relate to the work on this document:Committee reference GSE/30Draft for comment 13/30199128 DCPublication historyFirst published February 1988Second edition, April 1998
3、Third edition, April 2005Fourth (present) edition, November 2015Amendments issued since publicationDate Text affectedBS 6891:2015 BRITISH STANDARDContentsForeword iii1 Scope 12 Normative references 43 Terms and definitions 74 Competence 125 Design and planning 136 Materials and components 167 Jointi
4、ng 188 Installation 209 Installation of flexible hoses, tubing, assemblies and their connections 6610 Commissioning 6911 Maintenance 72AnnexesAnnex A (informative) Guide to sizing pipework installations 73Annex B (informative) Sulfidation of natural gas installations 81Annex C (informative) Summary
5、and principal conclusions of the AdvanticaResearch Project, Gas in intermediate floors, Report Number 6699 28 82Annex D (informative) Protected area 84Annex E (normative) LPG Final stage regulator and safety devices 85Annex F (informative) Dangerous Substances and Explosive AtmospheresRegulations 17
6、, 18 88Bibliography 90List of figuresFigure 1 2nd family gas installation with an internal meter 2Figure 2 3rd family gas installation with cylinders 3Figure 3 3rd family gas installation with bulk storage vessels 3Figure 4 Selection of applicable standard(s) for gas installations 4Figure 5 Sizing p
7、ipework Design maximum pressure loss for typicalinstallations 15Figure 6 Non-contact voltage detector (single pole) Example 22Figure 7 Use of temporary continuity bond 23Figure 8 Position of main protective bonding conductor connection 26Figure9Typical notification where main protective bonding cond
8、uctor isfound not to be present 27Figure 10 AECV positions 28Figure 11 Typical exterior pipework 31Figure 12 Notching and drilling of metal web joists and timber-engineeredjoists 34Figure 13 Limits for notching and drilling of solid timber floor joists 35Figure 14 Pipework in concrete compartment fl
9、oors 38Figure 15 Pipework in timber fire compartment floors 39Figure 16 Typical examples of pipework installed in solid floors 42Figure 17 Typical examples of pipework installed in solid constructionwalls 46Figure 18 Typical examples of pipework installed in timber and lightsteel-framed construction
10、 walls 50Figure 19 Limits for drilling of wall studding 53Figure 20 Buried pipework 56Figure 21 Cross-sectional area of duct 59Figure 22 Typical pipework in multi-storey buildings containing flats ormaisonettes 60Figure 23 Copper and steel pipe in a protected area 62Figure 24 Typical method of accom
11、modating movement for pipework passingthrough a masonry/timber-frame wall 65Figure 25 Identification of hoses, tubing and assemblies for use with LPG 67BRITISH STANDARD BS 6891:2015 The British Standards Institution 2015 iFigure A.1 Example natural gas installation 79List of tablesTable 1 Pipework c
12、overed by BS 6891 2Table 2 Approval bodies and statutory regulations by country/territory 12Table 3 Competence requirements by country/territory 13Table 4 Maximum interval between pipework supports 32Table 5 Buried external pipework 55Table 6 Free area of ventilation openings 58Table 7 Operating pre
13、ssure (LPG) 70Table A.1 Approximate natural gas pressure loss data (mbar/m) coppertube 75Table A.2 Approximate natural gas pressure loss data (mbar/m) steeltube 76Table A.3 Approximate LPG (propane) pressure loss data (mbar/m) coppertube 77Table A.4 Approximate LPG (propane) pressure loss data (mbar
14、/m) steeltube 78Table A.5 Typical allowances for pressure loss of fittings 79Table A.6 Sizing results 80Table E.1 Pressure characteristics of various regulators (LPG) 86Table E.2 Minimum proximity distances for relief valve vent tips(millimetres) 88Summary of pagesThis document comprises a front cov
15、er, an inside front cover, pages i to iv,pages 1 to 94, an inside back cover and a back cover.BRITISH STANDARDBS 6891:2015ii The British Standards Institution 2015ForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British Standards Instit
16、ution, and came into effect on 30 November 2015. Itwas prepared by Panel GSE/30/-/3, Domestic installation pipes, under theauthority of Technical Committee GSE/30, Gas Installations (1st, 2nd and 3rdfamily gases). A list of organizations represented on this committee can beobtained on request to its
17、 secretary.NOTE 1 The standard now covers the main installation requirements for 3rd familygas installations that were previously covered by BS 5482-1.NOTE 2 The general installation requirements for 3rd family gas installationsspecified in this standard also apply to gas installations supplied with
18、 LPG/airmixtures used in the Channel Islands or the Isle of Man, provided: any gas equipment being installed has been appropriately converted and issuitable for the gas being supplied; and the requirements of the standard do not conflict with local regulations orauthorized local custom and practice.
19、SupersessionBS 6891:2015 supersedes BS 6891:2005+A2:2008, which is withdrawn, andpartially supersedes BS 5482-1:2005, which is partially withdrawn.Information about this documentIn this revision, the layout of the standard has been modified to follow thesystematic approach adopted in other gas insta
20、llation standards. The revisionprovides an update of the previous edition and has been updated to reflectchanges in installation practice and legislation, and align with other appropriatestandards. A number of other safety initiatives have also been included thathave not previously been covered else
21、where in detail. The opportunity has alsobeen taken to combine the pipework requirements for 2nd and 3rd family gas(natural gas and LPG) installations into a single standard for use by the gasindustry.Use of this documentIt has been assumed in the preparation of this British Standard that theexecuti
22、on of its provisions will be entrusted to appropriately qualified andexperienced people, for whose use it has been produced.Users of this British Standard are advised to consider the desirability of selectingproducts for which independent quality assurance certification against theappropriate produc
23、t manufacture standard has been obtained.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative material is presen
24、ted in notesin smaller italic type, and does not constitute a normative element.BRITISH STANDARD BS 6891:2015 The British Standards Institution 2015 iiiContractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible fo
25、r its correct application.Compliance with this British Standard cannot confer immunity from legalobligations.Attention is drawn to the following statutory regulations: The Gas Safety (Installation and Use) Regulations 1998 1; The Gas Safety (Installation and Use) (Northern Ireland)Regulations 2004 2
26、; The Gas Safety (Installation and Use) Regulations 1994, as amended andapplied by the Gas Safety (Application) (Isle of Man) Order 1996 3; The Health and Safety (Gas) (Guernsey) Ordinance 2006 4; The Building Regulations 2010 (England and Wales), as amended 5; The Building Regulations (Northern Ire
27、land) 2012 6; The Building (Scotland) Regulations 2004, as amended 7; The Gas Safety (Management) Regulations 1996 8; The Gas Safety (Management) Regulations (Northern Ireland) 1997 9.BRITISH STANDARDBS 6891:2015iv The British Standards Institution 20151 ScopeThis British Standard specifies the desi
28、gn, installation, commissioning andmaintenance of gas installation pipework carrying 2nd and 3rd family gas of upto 35 mm (R 114) on premises, including residential park homes (2ndand 3rd family gas) and caravan holiday homes (2nd family gas) (see Table 1 andexamples in Figure 1 to Figure 3; see als
29、o Figure 4).NOTE 1 The principles of the standard can also be applied to the design,installation, commissioning and maintenance of gas installation pipeworkcarrying 1st family gas.NOTE 2 Annex A gives a method for calculating pipe sizes. Annex B discusses thesulfidation of natural gas installations,
30、 while Annex C summarizes the conclusions ofa report on gas in intermediate floors. Guidance on determining whether an areacan be deemed a “protected area” is given in Annex D. Requirements for LPG finalstage regulator and safety devices are specified in Annex E. Annex F discusses theneed for gas pi
31、pework design and installation for commercial installations to satisfyregulatory requirements regarding explosive atmospheres.This British Standard is not applicable to:a) service pipework and distribution systems;b) pipework contained within an appliance;c) bulk storage vessels;d) LPG pipework inst
32、alled in leisure accommodation vehicles and foraccommodation purposes in vehicles in accordance with BS EN 1949;e) boats, yachts and other vessels;f) gas pipework supplying or within appliances having their own gas supply,such as mobile heaters; org) gas pipework supplying or within catering establi
33、shments covered byBS 6173.BRITISH STANDARD BS 6891:2015 The British Standards Institution 2015 1Table 1 Pipework covered by BS 6891Gas type Pipework MaximumnominaldiameterA)NominaloperatingpressurembarB)2nd family(NG)Downstream of the primary meter installation, but notdownstream of the inlet of any
34、 appliance isolationvalve or the inlet of the self-sealing connector of anyflexible connectionR114 steel,DN 35A)213rd family(LPG)Downstream of: the emergency control valve (ECV) located on theoutside of the property where no meter is fitted;or the outlet of the final regulator where this islocated d
35、ownstream of the ECV; or the outlet of the final regulator where this islocated downstream of any cylinders and there isno ECV; or the primary meter installation,but not downstream of the inlet of any applianceisolation valve or the inlet of the self-sealing connectorof any flexible connection.R114
36、steel,DN 35A)37 (propane)28 (butane)A)Dependent upon material type.B)1 bar = 105 N/m2= 100 kPa.NOTE Unless stated otherwise:a) the diameter for pliable corrugated (stainless-steel) tubing refers to the inside diameter; andb) the diameter for carbon, stainless-steel tubing, copper and polyethylene (P
37、E) refers to the outsidediameter.Figure 1 2nd family gas installation with an internal meterKey1 Service pipe 7 Appliance isolation valve2 Primary meter installation 8 Appliance3 Installation pipework 9 Part of installation within the scope of BS 68914 Appliance connector R Regulator5 Service isolat
38、ion valve (where fitted) M Meter6 Emergency control valveBRITISH STANDARDBS 6891:20152 The British Standards Institution 2015Figure 2 3rd family gas installation with cylindersKey1 Service pipework 6 Appliance isolation valve2 Installation pipework 7 Appliance3 Appliance connector 8 Part of installa
39、tion within the scope of BS 68914 Cylinders R Regulator with over-pressure shut-off5 Emergency control valve ACD Automatic changeover deviceFigure 3 3rd family gas installation with bulk storage vesselsKey1 Service pipework 6 Appliance isolation valve2 Installation pipework 7 Appliance3 Appliance co
40、nnector 8 Part of installation within the scope of BS 68914 Bulk storage vessel(s) 9 Vessel isolation valve5 Emergency control valve R Regulator with over-pressure shut-offBRITISH STANDARD BS 6891:2015 The British Standards Institution 2015 3Figure 4 Selection of applicable standard(s) for gas insta
41、llations* Industrial and commercialNOTE For commercial premises less than 35 mm, IGEM/UP/2 12 may also be utilized.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe e
42、dition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS 21, Specification for pipe threads for tubes and fittings where pressure-tightjoints are made on the threads (metric dimensions)BS 143 and 1256, Threaded pipe fittings in
43、malleable cast iron and cast copperalloyBRITISH STANDARDBS 6891:20154 The British Standards Institution 2015BS 669-1, Flexible hoses, end fittings and sockets for gas burning appliances Part 1: Specification for strip-wound metallic flexible hoses, covers, end fittingsand sockets for domestic applia
44、nces burning 1st and 2nd family gasesBS 669-2, Flexible hoses, end fittings and sockets for gas burning appliances Part 2: Specification for corrugated metallic flexible hoses, covers, end fittingsand sockets for catering appliances burning 1st, 2nd and 3rd family gasesBS 864-2, Capillary and compre
45、ssion tube fittings of copper and copper alloy Part 2: Specification for capillary and compression fittings for copper tubes1)BS 1552, Specification for open bottomed taper plug valves for 1st, 2nd and 3rdfamily gases up to 200 mbarBS 3016, Specification for pressure regulators for liquefied petrole
46、um gases1)BS 3212, Specification for flexible rubber tubing, rubber hose and rubber hoseassemblies for use in LPG vapour phase and LPG/air installationsBS 4371, Specification for fibrous gland packingsBS 5114, Specification for performance requirements for joints and compressionfittings for use with
47、 polyethylene pipes1)BS 6172, Installation and maintenance of domestic gas cooking appliances(2nd and 3rd family gases) SpecificationBS 6362, Specification for stainless steel tubes suitable for screwing inaccordance with BS 21 Pipe threads for tubes and fittings where pressure-tightjoints are made
48、on the threadsBS 6400-1, Specification for installation, exchange, relocation and removal of gasmeters with a maximum capacity not exceeding 6 m3/h Part 1: Low pressure(2nd family gases)BS 6400-2, Specification for installation, exchange, relocation and removal of gasmeters with a maximum capacity n
49、ot exceeding 6 m3/h Part 2: Mediumpressure (2nd family gases)BS 6400-3, Specification for installation, exchange, relocation and removal of gasmeters with a maximum capacity not exceeding 6 m3/h Part 3: Low andmedium pressure (3rd family gases)2)BS 6501-1, Metal hose assemblies Part 1: Guidance on the construction and useof corrugated hose assembliesBS 6956, Jointing materials and compoundsBS 7624, Installation and
