BS 7967-2015 Guide for the use of electronic portable combustion gas analysers for the measurement of carbon monoxide in dwellings and the combustion performance of domestic gas-fi.pdf

1、BSI Standards PublicationGuide for the use of electronic portable combustion gas analysers for the measurement of carbon monoxide in dwellings and the combustion performance of domestic gasfired appliancesBS 7967:2015BS 7967:2015 BRITISH STANDARDPublishing and copyright informationThe BSI copyright

2、notice displayed in this document indicates when the document was last issued. The British Standards Institution 2015 Published by BSI Standards Limited 2015ISBN 978 0 580 77879 7ICS 13.040.40; 97.100.20The following BSI references relate to the work on this document: Committee reference GSE/30 Draf

3、t for comment 14/30258585 DCPublication historyFirst published as BS 7967-1, BS 7967-2 and BS 7967-3, December 2005 BS 7967-4, June 2007First published as BS 7967, February 2015Amendments issued since publicationDate Text affected The British Standards Institution 2015 iBS 7967:2015BRITISH STANDARDC

4、ontentsForeword iv1 Scope 12 Normative references 33 Terms and definitions 34 Competence 55 Gas analyser 75.1 Selection 75.2 Preparation of gas analyser 75.2.1 Pre-checks before use 75.2.2 Preparation of gas analyser for use 76 Investigation of reports of fumes, smells and spillage/leakage of combus

5、tion products in dwellings 86.1 Determining scope of investigation 86.2 Safety principles 86.2.1 Basic rules 86.2.2 CO investigation action levels 96.3 Preliminary procedure for carrying out checks for CO spillage/leakage from gas appliances 96.3.1 Possible circumstance identified by preliminary dis

6、cussion with customer (see Figure 1) 116.3.2 Sweep test for open-flue and room-sealed appliances 116.3.3 Detailed discussion with customer (see Figure 1) 116.4 Confirming safe operation of a gas appliance 126.4.1 Investigation of “suspect” gas appliances 126.4.2 Detailed examination 146.4.3 Addition

7、al checks when combustion performance is satisfactory 156.4.4 Final checks 156.5 Specific gas appliance considerations 156.5.1 General 156.5.2 Air extraction/circulation systems 156.5.3 Flueless (type A) 166.5.4 Open-flue (type B) 166.5.5 Room-sealed (type C) 166.5.6 Warm air heaters 166.5.7 Fires 1

8、76.5.8 Fire/back boilers and fire/back circulators 176.5.9 Cookers 186.5.10 Appliances in compartments 186.6 Check of non-gas appliances and/or for continued smell/presence of CO 187 Reacting to activation of CO detectors 207.1 General 207.2 Electrical CO detector 207.3 CO indicator card 228 Determi

9、ning ambient levels of carbon monoxide (CO) in a room 228.1 General advice on measurement procedures 228.2 Preparation for CO build-up testing 238.3 Testing procedures 238.3.1 General 238.3.2 Room-sealed (type C) appliances 248.3.3 Open-flue (type B) appliances 248.3.4 Flueless (type A) appliances 2

10、48.3.5 Additional considerations 258.3.6 Identifying external sources of CO 259 Information on levels of CO 269.1 General 26BS 7967:2015ii The British Standards Institution 2015BRITISH STANDARD9.2 Additional information on levels of CO for gas cookers 269.3 Responding to CO levels 269.4 CO from appl

11、iances other than gas appliances 279.5 CO from sources other than appliances 279.6 References to information on the effects of CO 289.7 Movement of CO 289.8 Generation of CO, smells and fumes when no fault with gas installation 2810 Determination of the combustion performance of an appliance 2910.1

12、Types of gas-fired appliance 2910.2 General procedures 2910.3 Sample probes 3010.4 Sampling procedure 3010.4.1 Flueless (type A) appliances 3010.4.2 Open-flue (type B) appliances 3210.4.3 Room-sealed (type C) appliances 3411 Procedure for commissioning, servicing and maintenance using a gas analyser

13、 3411.1 General 3411.2 Confirmation of safe and/or efficient operation at the time of commissioning 3511.3 Determination of the level of servicing required and subsequent actions (see Figure 5) 3511.4 Confirmation of satisfactory combustion following servicing in accordance with the gas appliance in

14、structions (Figure 6) 3711.5 Confirmation of satisfactory combustion following maintenance (Figure 7) 3812 Combustion action levels 4012.1 General 4012.2 CO/CO2ratios above the action level 4112.3 Failure to achieve a satisfactory combustion performance 4113 Completion and leaving the property 4114

15、Reports 42AnnexesAnnex A (informative) Gas analyser 43Annex B (informative) Movement of CO in buildings 43Annex C (normative) Multi-hole sample probes 45Annex D (informative) Flue/draught diverter configurations for warm air heaters 46Annex E (informative) Background to the use of a gas analyser in

16、regular servicing 47Annex F (informative) Dwelling investigation report 48Annex G (informative) Gas appliance investigation report 49Bibliography 50List of figuresFigure 1 Flow chart of the preliminary procedure for carrying out checks for CO spillage/leakage from gas appliances 10Figure 2 Flow char

17、t for confirming safe operation of a gas appliance 12Figure 3 Flow chart for non-gas appliances and/or continued smell/presence of CO 19Figure 4 Responding to electrical CO detector (alarm) activations 21Figure 5 Procedure for use of a gas analyser to determine whether or not the combustion performa

18、nce is satisfactory, and the subsequent actions to be performed 36 The British Standards Institution 2015 iiiBS 7967:2015BRITISH STANDARDFigure 6 Procedure for the use of a gas analyser as an aid to checking combustion performance subsequent to servicing carried out in accordance with the gas applia

19、nce instructions 38Figure 7 Procedure for the use of a gas analyser to confirm satisfactory combustion following maintenance 39Figure C.1 Probe for gas cooker grill 45Figure C.2 Angled probe 45Figure D.1 Flue/draught diverter configurations for warm air heaters 46Figure F.1 Example format of a dwell

20、ing investigation report 48Figure G.1 Example format of a gas appliance investigation report 49List of tablesTable 1 Approval bodies and statutory regulations by country/territory 6Table 2 Competence requirements by country/territory 6Table 3 Combustion performance (CO/CO2ratio) action levels 13Summ

21、ary of pagesThis document comprises a front cover, an inside front cover, pages i to vi, pages 1 to 52, an inside back cover and a back cover.BS 7967:2015iv The British Standards Institution 2015BRITISH STANDARDForewordPublishing informationThis British Standard is published by BSI Standards Limited

22、, under licence from The British Standards Institution, and came into effect on 28 February 2015. It was prepared by Panel GSE/30/-/21, Gas Analysers, under the authority of Technical Committee GSE/30, Gas installations (1st, 2nd and 3rd family gases). A list of organizations represented on this com

23、mittee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 7967-1:2005, BS 7967-2:2005, BS 7967-3:2005 and BS 7967-4:2007, which are withdrawn. BS 7967-5, which covers the use of electronic portable combustion gas analysers in non-domestic premises, remains cu

24、rrent.Information about this documentThis British Standard is intended to be used in conjunction with the gas appliance commissioning, servicing and maintenance instructions and the Gas Industry Unsafe Situations Procedure 1.Its purpose is to provide:a) information that is intended to assist gas ope

25、ratives (see 3.12) in considering all the relevant issues and circumstances relating to the identification of sources of fumes and smells and the cause of carbon monoxide (CO) detector activation, or when spillage/leakage of combustion products is suspected or encountered from an unknown source; b)

26、information on combustion performance characteristics of a range of gas appliance types and the levels at which remedial action is to be taken;c) advice on the actions to be taken when elevated concentrations of carbon monoxide (CO) are identified in dwellings; d) the appropriate method(s) for using

27、 an electronic portable combustion gas analyser to: check the combustion performance of gas appliances; measure the concentrations of CO within a dwelling and, in certain circumstances (see Clause 1, Notes 4 and 5, and Commentary on 8.1), detect the presence of carbon dioxide (CO2); and identify sou

28、rces of the CO spillage/leakage;e) good practice guidance on the use of electronic portable combustion gas analysers as part of a servicing and/or maintenance procedure for gas appliances in dwellings; andNOTE Electronic portable combustion gas analysers are often referred to colloquially as “flue g

29、as analysers” (FGAs).f) guidance on the use of combustion gas analysis as a diagnostic tool to assist a gas operative to confirm the safe and efficient functioning of a gas appliance when work has been done on that appliance.This standard:1) is not intended to be an exhaustive step-by-step procedure

30、, and gas operatives need to hold an appropriate certificate of gas safety competence (see Clause 4) and use sound judgement in deciding how best to respond to individual cases. Where a gas operative is carrying out routine servicing or repair work on an appliance, testing could indicate a spillage/

31、leakage problem. In such cases, there is no obligation to carry out all the considerations, inspections and tests described in this guidance as the gas operative has personally identified the The British Standards Institution 2015 vBS 7967:2015BRITISH STANDARDissue and the source of spillage/leakage

32、 is known. Only those subclauses in this standard that are concerned with the particular appliance involved would be relevant in such circumstances;2) supplements gas appliance manufacturers servicing requirements through a generic approach to servicing and maintenance activity and by identifying si

33、tuations where combustion gas analysis cannot be deployed or is not appropriate;3) does not intend that a combustion gas analysis be used as a substitute for normal servicing and/or maintenance carried out in accordance with the gas appliance instructions;4) recognizes that it is important that the

34、gas appliance instructions are followed; and5) continues to use the term “flue” in its traditional UK sense, as any structure used to conduct the combustion products from an appliance to the outside air; as opposed to the European approach in standards, where a “flue” is only the passageway in the s

35、tructure through which the combustion products flow.The documents available as downloads from the sites referenced throughout the document were last accessed on 10 February 2015.Use of this documentAs a guide, this British Standard takes the form of guidance and recommendations. It should not be quo

36、ted as if it were a specification or a code of practice and claims of compliance cannot be made to it.It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to competent people (see Clause 4 for information on competence), for whose use

37、 it has been produced.Presentational conventionsThe guidance in this standard is presented in roman (i.e. upright) type. Any recommendations are expressed in sentences in which the principal auxiliary verb is “should”. The word “may” is used in the text to express permissibility, e.g. as an alternat

38、ive to the primary recommendation of the clause. The word “can” is used to express possibility, e.g. a consequence of an action or an event.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.Notes give references

39、and additional information that are important but do not form part of the recommendations. Commentaries give background information.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct appli

40、cation.Compliance with a British Standard cannot confer immunity from legal obligations.Attention is drawn to the following statutory regulations. The Gas Safety (Installation and Use) Regulations 1998 2 The Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004 3 The Gas Safety (Appl

41、ication) Order (Isle of Man) 1996 4 The Reporting of Injuries, Diseases and Dangerous Occurrences Regulations 2013 5 The Gas Safety (Management) Regulations 1996 6 The Gas Safety (Management) Regulations (Northern Ireland) 1997 7BS 7967:2015 BRITISH STANDARDvi The British Standards Institution 2015T

42、his page deliberately left blank The British Standards Institution 2015 1BS 7967:2015BRITISH STANDARD1 Scope1.1 This standard provides guidance for gas operatives on:a) the general use of an electronic portable combustion gas analyser conforming to BS EN 50379-3 and BS 7927:1998 incorporating Amendm

43、ent No. 1:1999;NOTE 1 This standard assumes that a portable combustion gas analyser often referred to colloquially as a “flue gas analyser” (FGA) of the type specified in BS EN 50379-3 or BS 7927:1998 incorporating Amendment No. 1:1999 is available to the gas operative and the operative is competent

44、 in its use and the interpretation of any reading obtained. This competence can be demonstrated by satisfactory completion of the relevant ACS assessments, which cover the use of electronic portable combustion gas analysers. See Clause 4 for further information on competence.NOTE 2 BS EN 50379-3 sup

45、erseded BS 7927:1998 incorporating Amendment No. 1:1999 on 1 March 2007. However, electronic portable combustion gas analysers conforming to BS 7927:1998 incorporating Amendment No. 1:1999 remain acceptable for the purposes of this standard.b) the use of such an electronic portable combustion gas an

46、alyser to determine ambient levels of carbon monoxide (CO) and, in certain circumstances (see Notes 4 and 5, and Commentary on 8.1), detect the presence of carbon dioxide (CO2) in dwellings;NOTE 3 A definition of a dwelling is given in 3.7.NOTE 4 One of the main combustion products from gas applianc

47、es is CO2, which is mainly regarded as an asphyxiant, but is also a toxic substance which could be present in the air in sufficient quantity to prove harmful. For guidance on the occupational health considerations of CO2, reference can be made to the HSE Guidance note on Workplace exposure limits, E

48、H40/2005 8.NOTE 5 Electronic portable combustion gas analysers that calculate CO2levels from an oxygen (O2) measurement are: well proven for calculating CO2levels in combustion gases in the flue of an appliance; not suitable for measuring ambient levels of CO2in dwellings; and able to detect increas

49、es in the ambient CO2levels in ambient atmospheres and such increases in CO2 will provide an early indication of increasing build-up of products of combustion in the room (see Commentary on 8.1).c) the use of an electronic portable combustion gas analyser to measure CO and CO2in combustion products from the following types of gas-fired appliances:1) flueless appliances (type A appliances);2) open-flue appliances (type B appliances);3) room-sealed appliances (type C appliances); and4) all appliances for whi