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1、BRITISH STANDARD BS 5885-1: 1988 Incorporating Amendments Nos. 1 and 2 Automatic gas burners Part 1: Specification for burners with input rating 60 kW and above ICS 27.060.20 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:50:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5885-1:1988 Thi
2、s British Standard, having been prepared under the direction of the Gas Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 August 1988 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference GSE/27 Draft fo
3、r comment 86/73991 DC ISBN 0 580 16691 0 Committees responsible for this British Standard The preparation of this British 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 Co
4、mbustion Equipment Manufacturers Association British Gas plc Chief and Assistant Chief Fire Officers Association Department of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Fire Offices Committee Health and Safety Executive Society of British Gas Industr
5、ies Water-tube Boilermakers Association Amendments issued since publication Amd. No.Date of issueComments 6631December 1990 9260July 1997Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:50:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5885-1:1988 BSI
6、 09-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Verification3 4Gas flow pipework and controls4 4.1Filters and strainers4 4.2Pipework and flow components4 4.3Gas flow in pipework6 4.4Vents on safety shut-off systems6 4.5Gas supply6 4.6Safety shut-off
7、 systems8 5Combustion air, pre-purge and post-purge11 5.1Combustion air11 5.2Pre-purge and post-purge12 6Electrical supply and ancillary equipment12 6.1Electricity supply12 6.2Electrical equipment13 6.3Instrument and control fluid supplies14 7Flame safeguard system14 7.1Flame detection14 7.2Start-ga
8、s flame establishment15 7.3Main flame establishment15 8Control system requirements16 9Fuel/air ratio control16 10Materials17 10.1General17 10.2Metallic materials17 10.3Non-metallic materials17 10.4Glands and spindle packings17 10.5Jointing materials17 10.6Flexible pipes and pipe connections17 11Cons
9、tructional requirements18 11.1Burner construction18 11.2Fixing18 12Manufacturers literature19 13Marking19 14Commissioning instructions19 Appendix A Dual fuel burners21 Appendix B Over-pressure protection21 Table 1 Test gases3 Table 2 Wall thickness of pipes complying with BS 36014 Table 3 Connection
10、s for valves and pipework4 Table 4 Inlet pressure ranges7 Table 5 Main gas safety shut-off valve system requirements9 Table 6 Flame safeguard drop-out times14 Table 7 Summary of materials18 Publications referred to23 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:50:47 GMT+00:00 2006, Unc
11、ontrolled Copy, (c) BSI BS 5885-1:1988 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, which is withdrawn. In general, each requirement in
12、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 measurement is considered to be self-evident. Verific
13、ation 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 documentary proof. Certain requirements are only capable of bein
14、g 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 large or special plant, commissioning procedures will also
15、 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 application and therefore the burner may require additio
16、nal 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 satisfy all the safety requirements of dual fuel burners.
17、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 intent of this standard. Similarly, new systems or proced
18、ures resulting from advances in technology may be applied to give equal or improved safety. It is not intended that this Part of BS 5885 should prohibit the development or use of such systems, but any departure from the specific requirements of this standard should be made only on the basis of sound
19、 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 all the necessary provisions of a contract. Users of
20、 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 and ii, pages 1 to 24, an inside back cover and a bac
21、k 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. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:50:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5885-1:1988 BS
22、I 09-19991 1 Scope This Part of BS 5885 specifies minimum requirements for automatic gas burners employing forced or mechanically induced draught and having a heat input rating of 60 kW and above. Such burners may be of packaged or non-packaged types, and may be designed for use with 1st, 2nd or 3rd
23、 family gases. BS 5885 applies to burners intended for use 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
24、operating only on gas. It does not cover multi-burners. Guidance on dual fuel burners is given in Appendix A. This Part of BS 5885 specifies requirements primarily for the safety aspects of automatic control and operation. It does not constitute a complete specification for automatic burners and the
25、ir ancillary equipment. NOTE 1The use of gases which are dirty, wet, of variable composition or high dewpoint may cause difficulties which are not covered in detail by this Part of BS 5885. In such cases, suppliers and users of equipment will need to take additional measures to comply with the requi
26、rements of this standard. NOTE 2Burners complying with this Part of BS 5885 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 mbar1); b) where the maximum
27、combustion air pressure is not greater than 75 mbar, and where 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 50 mm; c) where the start-gas and main gas supplies are each under the control of at least one safety s
28、hut-off valve with a proved capability of withstanding a reverse flow pressure differential of at least twice the maximum combustion air pressure. In other circumstances burners complying with this Part of BS 5885 may require additional protection, e.g. non-return valves, and in such cases reference
29、 should be made to the fuel supplier. NOTE 3The titles of the publications 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 BS 5885 the definitions given in BS 1179-6 apply together with the following. NOTEWhere a te
30、rm is defined in both this Part of BS 5885 and BS 1179-6, the definition 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
31、 intervention 2.2 burner rating the maximum burner thermal input expressed 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 plan
32、t in which the main combustion takes place 2.5 flame detector that 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
33、safety shut-off valves 2.7 flame safeguard a control responsive to 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 erroneous
34、ly signals the presence of a flame 2.9 flow rate metering (proportioning 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
35、 2.11 governor creep the tendency of a governor outlet pressure at zero flow to rise gradually to the inlet pressure due to seat leakage 1) 1 mbar = 100 N/m2 = 100 Pa. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:50:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5885-1:1988 2 BSI 09-1
36、999 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 firing rate is either full on or at low fire 2.14 induced draught burner a burner into which the combustion air is introduc
37、ed 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 BS 4250-1 2.16 lock-out a safety shut-down condition of a control system such that restart cannot be accomplished without m
38、anual 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-off valve(s) is permitted to be open before the pilot flame is extinguished and before the flame safeguard is required to
39、 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 the process control, the firing rate is variable between the full on and low fire rates 2.21 natural gas a 2nd family ga
40、s 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 during each stage of the operating sequence. It also includes an explanation of the system behaviour in the event that any s
41、ignals 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 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
42、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 to sense a system parameter (for example, gas pressure) in order to ascertain either directly or indirectly whether it is
43、 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 system check and which is capable of either: a) detecting small leakage rates, e.g. a pressure proving system; or b) safely v
44、enting 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 the introduction of air into the combustion chamber and flue passages so as to displace any remaining fuel/air mixture Lice
45、nsed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:50:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5885-1:1988 BSI 09-19993 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 intervention or aut
46、omatic 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 open when ener
47、gized 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 flame establis
48、hed 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 permitted to be ope
49、n, 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 safety 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
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