1、BRITISH STANDARD BS 5885-1: 1988 Incorporating Amendments Nos. 1 and 2 Automatic gas burners Part 1: Specification for burners with input rating 60kW and above ICS 27.060.20BS5885-1:1988 This British Standard, having been prepared under the directionof the Gas StandardsCommittee, waspublished under
2、the authorityofthe Board of BSIandcomes intoeffect on 31 August 1988 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference GSE/27 Draft for comment 86/73991 DC ISBN 0 580 16691 0 Committees responsible for this British Standard The preparation of this Brit
3、ish Standard was entrusted by the Gas Standards Committee (GSE/-) to Technical Committee GSE/27, upon which the following bodies were represented: British Coal Corporation British Combustion Equipment Manufacturers Association British Gas plc Chief and Assistant Chief Fire Officers Association Depar
4、tment of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Fire Offices Committee Health and Safety Executive Society of British Gas Industries Water-tube Boilermakers Association Amendments issued since publication Amd. No. Date of issue Comments 6631 Decem
5、ber 1990 9260 July 1997 Indicated by a sideline in the marginBS5885-1:1988 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Verification 3 4 Gas flow pipework and controls 4 4.1 Filters and strainers 4 4.2 Pipework and flow components 4 4.
6、3 Gas flow in pipework 6 4.4 Vents on safety shut-off systems 6 4.5 Gas supply 6 4.6 Safety shut-off systems 8 5 Combustion air, pre-purge and post-purge 11 5.1 Combustion air 11 5.2 Pre-purge and post-purge 12 6 Electrical supply and ancillary equipment 12 6.1 Electricity supply 12 6.2 Electrical e
7、quipment 13 6.3 Instrument and control fluid supplies 14 7 Flame safeguard system 14 7.1 Flame detection 14 7.2 Start-gas flame establishment 15 7.3 Main flame establishment 15 8 Control system requirements 16 9 Fuel/air ratio control 16 10 Materials 17 10.1 General 17 10.2 Metallic materials 17 10.
8、3 Non-metallic materials 17 10.4 Glands and spindle packings 17 10.5 Jointing materials 17 10.6 Flexible pipes and pipe connections 17 11 Constructional requirements 18 11.1 Burner construction 18 11.2 Fixing 18 12 Manufacturers literature 19 13 Marking 19 14 Commissioning instructions 19 Appendix A
9、 Dual fuel burners 21 Appendix B Over-pressure protection 21 Table 1 Test gases 3 Table 2 Wall thickness of pipes complying with BS 3601 4 Table 3 Connections for valves and pipework 4 Table 4 Inlet pressure ranges 7 Table 5 Main gas safety shut-off valve system requirements 9 Table 6 Flame safeguar
10、d drop-out times 14 Table 7 Summary of materials 18 Publications referred to 23BS5885-1:1988 ii BSI 09-1999 Foreword This Part of BS 5885 has been prepared under the direction of the Gas Standards Committee and applies primarily to single gas-fired automatic burners. It is a revision of BS 5885:1980
11、, which is withdrawn. In general, each requirement in this Part is accompanied by an appropriate means of verification, such means being by inspection, by measurement or by specified test. In those cases where verification is to be achieved by measurement, no test method is given since the method of
12、 measurement is considered to be self-evident. Verification of compliance with requirements which invoke other British Standards is to be demonstrated by means of a declaration from the burner manufacturer and, where third party certification is required, may necessitate the production of documentar
13、y proof. Certain requirements are only capable of being verified when the burner is installed in its associated appliance. In these cases no verification procedure is specified as it is anticipated that the relevant appliance standard will incorporate the appropriate method of verification. For larg
14、e or special plant, commissioning procedures will also need to take this into account. Requirements which also relate to burners employing induced draught fans can only be tested in situ. It should also be appreciated that this Part of BS 5885 may not contain all the requirements for a particular ap
15、plication and therefore the burner may require additional features. Much of this Part of BS 5885 is applicable to dual fuel burners. However, it should not be assumed that compliance with this Part (or with standards dealing with burners using oil fuel, e.g. BS 799 and BS 5410) will necessarily sati
16、sfy all the safety requirements of dual fuel burners. For guidance, see Appendix A. It is recognized that for specialist heating processes it is permissible to use designs and test methods which differ from those specifically defined in this Part of BS 5885 but which nevertheless comply with the int
17、ent of this standard. Similarly, new systems or procedures resulting from advances in technology may be applied to give equal or improved safety. It is not intended that this Part of BS5885 should prohibit the development or use of such systems, but any departure from the specific requirements of th
18、is standard should be made only on the basis of sound engineering judgement and experience. It has been assumed in the drafting of this British Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people. A British Standard does not purport to include
19、 all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i
20、and ii, pages1 to 24, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5885-1:1988 BSI 09-1999 1 1 Scope This Part of BS5885 specifies minimum
21、 requirements for automatic gas burners employing forced or mechanically induced draught and having a heat input rating of 60kW and above. Such burners may be of packaged or non-packaged types, and may be designed for use with 1st, 2nd or 3rd family gases. BS5885 applies to burners intended for use
22、in industrial processes. It does not cover burners intended for use in heating appliances, e.g. boilers, which are covered by BS EN 676, Automatic forced draught burners for gaseous fuels. It covers single burners and dual fuel burners when operating only on gas. It does not cover multi-burners. Gui
23、dance on dual fuel burners is given in Appendix A. This Part of BS5885 specifies requirements primarily for the safety aspects of automatic control and operation. It does not constitute a complete specification for automatic burners and their ancillary equipment. NOTE 1The use of gases which are dir
24、ty, wet, of variable composition or high dewpoint may cause difficulties which are not covered in detail by this Part of BS5885. In such cases, suppliers and users of equipment will need to take additional measures to comply with the requirements of this standard. NOTE 2Burners complying with this P
25、art of BS5885 meet the statutory requirements for the protection against flow of air into piped gas supplies in the following circumstances: a) where the maximum combustion air pressure is not greater than 50 mbar 1) ; b) where the maximum combustion air pressure is not greater than 75mbar, and wher
26、e the start-gas and main gas supplies are each under the control of at least one class 1 safety shut-off valve of size not greater than 50mm; c) where the start-gas and main gas supplies are each under the control of at least one safety shut-off valve with a proved capability of withstanding a rever
27、se flow pressure differential of at least twice the maximum combustion air pressure. In other circumstances burners complying with this Part of BS5885 may require additional protection, e.g. non-return valves, and in such cases reference should be made to the fuel supplier. NOTE 3The titles of the p
28、ublications referred to in this standard are listed on pages 23, 24 and on the inside back cover. 2 Definitions For the purposes of this Part of BS5885 the definitions given in BS1179-6 apply together with the following. NOTEWhere a term is defined in both this Part of BS5885 and BS1179-6, the defin
29、ition given in this Part only applies. 2.1 automatic burner a burner in which, on starting from the completely shut-down condition, the start-gas flame is established and the main gas valves are actuated by the control without manual intervention 2.2 burner rating the maximum burner thermal input ex
30、pressed in terms of gross calorific value 2.3 closed position indicator switch a switch fitted to a safety shut-off valve which indicates when the valve is in the nominally closed position 2.4 combustion chamber that part of the plant in which the main combustion takes place 2.5 flame detector that
31、part of the flame safeguard that is responsive to flame properties and signals the presence of flame 2.6 flame failure the loss of the flame from the normally detected position by any cause other than the action of de-energizing the safety shut-off valves 2.7 flame safeguard a control responsive to
32、flame properties, detecting the presence of a nominated flame and, in the event of ignition failure or subsequent flame failure, causing safety shut-down or lock-out 2.8 flame simulation a condition where the flame detector erroneously signals the presence of a flame 2.9 flow rate metering (proporti
33、oning control) a fuel/air ratio control system which measures fuel and air flows and adjusts them to a predetermined ratio 2.10 forced draught burner a burner in which the combustion air is provided under pressure, usually from a fan 2.11 governor creep the tendency of a governor outlet pressure at
34、zero flow to rise gradually to the inlet pressure due to seat leakage 1) 1 mbar = 100N/m 2= 100Pa.BS5885-1:1988 2 BSI 09-1999 2.12 hazardous condition an abnormal condition involving risk to persons or property 2.13 high/low burner a burner in which, under the operation of the process control, the f
35、iring rate is either full on or at low fire 2.14 induced draught burner a burner into which the combustion air is introduced by providing a suction in the combustion chamber by mechanical means, usually a fan 2.15 liquefied petroleum gas (LPG) commercial butane or commercial propane complying with B
36、S4250-1 2.16 lock-out a safety shut-down condition of a control system such that restart cannot be accomplished without manual intervention 2.17 main flame a flame, other than the start-gas flame, on the main burner 2.18 main flame establishment period a period during which the main gas safety shut-
37、off valve(s) is permitted to be open before the pilot flame is extinguished and before the flame safeguard is required to supervise the main flame alone 2.19 main gas supply gas that is supplied to establish and maintain the main flame 2.20 modulating burner a burner in which, under the operation of
38、 the process control, the firing rate is variable between the full on and low fire rates 2.21 natural gas a 2nd family gas whose main constituent is methane 2.22 operational specification a full description of the control system together with an explanation of the operation of the control system dur
39、ing each stage of the operating sequence. It also includes an explanation of the system behaviour in the event that any signals from any external devices are incorrect (by failure to ignite, flame failure, airflow failure, etc.) 2.23 pilot flame a flame, established at a separate pilot burner, that
40、is used to ignite the main flame 2.24 post-purge a purge that follows shut-down 2.25 pre-purge a purge that precedes any ignition attempt 2.26 proof of closure switch a switch fitted to a safety shut-off valve with mechanical overtravel which proves the valve to be in the closed position 2.27 prove
41、to sense a system parameter (for example, gas pressure) in order to ascertain either directly or indirectly whether it is within a prescribed range 2.28 proving system a system to check the effective closure of the start-gas or main gas safety shut-off valves, which is more sophisticated than a syst
42、em check and which is capable of either: a) detecting small leakage rates, e.g. a pressure proving system; or b) safely venting small leakage rates, e.g. two safety shut-off valves in series each fitted with a proof of closure switch and a vent valve fitted with a proof of open switch. 2.29 purge th
43、e introduction of air into the combustion chamber and flue passages so as to displace any remaining fuel/air mixtureBS5885-1:1988 BSI 09-1999 3 2.30 safety shut-down the action of shutting off gas and ignition energy by means of a safety control such that restart takes place only after manual interv
44、ention or automatic recycling NOTESafety shut-down may include triggering an alarm. 2.31 safety shut-off system a system of safety shut-off valves with associated control circuits that enables the supply of gas to the burner to be admitted or shut-off 2.32 safety shut-off valve a valve designed to o
45、pen when energized and close automatically when de-energized, activated by the safety controls of a burner system 2.33 self-checking flame safeguard system a flame safeguard system having a device which automatically checks the functioning of the flame safeguard periodically 2.34 start-gas flame a f
46、lame established at the start-gas rate either at the main burner or at a separate pilot burner 2.35 start-gas flame establishment the establishment of a proved and supervised start-gas flame 2.36 start-gas flame ignition period the period during which the start-gas safety shut-off valve(s) is permit
47、ted to be open, before the flame safeguard is required to supervise the start-gas flame 2.37 start-gas flame proving period the period during which the start-gas flame is supervised by a flame safeguard system following the cessation of the ignition period and before the opening of the main gas safe
48、ty shut-off valve(s) 2.38 start-gas rate the restricted gas flow rate admitted either to a separate pilot burner or to the main burner during the start-gas flame establishment period 2.39 start-gas supply gas that is supplied at the start-gas rate to establish the start-gas flame 2.40 stoichiometric
49、 gas rate that gas rate at which, if reacted completely with the combustion air flow, the gas would just consume all the oxygen in the air 2.41 system check for safety shut-off valves, a system to check the effective closure of the main gas safety shut-off valves prior to start-up, e.g. two safety shut-off valves fitted with closed position indicator switches 2.42 town gas a 1st family gas, also commonly known as manufactured gas 2.43 type test a test carried out as part of a programme to approve to a particular specification a device which is representative of p
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