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1、BRITISH STANDARD BS 5990:1990 Incorporating Amendment No. 1 Specification for Direct gas-fired forced convection air heaters with rated heat inputs up to 2 MW for industrial and commercial space heating: safety and performance requirements (excluding electrical requirements) (2nd family gases) UDC 6
2、97.245.512:697.317.22 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5990:1990 This British Standard, having been prepared under the direction of the Gas Standards Policy Committee, was published under the authority of the Board of BSI a
3、nd comes into effect on 31 January 1990 BSI 07-1999 First published March 1981 Second edition January 1990 The following BSI references relate to the work on this standard: Committee reference GSE/20 Drafts for comment 83/73385 DC 86/70629 DC 89/70195 DC ISBN 0 580 17871 4 Committees responsible for
4、 this British Standard The preparation of this British Standard was entrusted by the Gas Standards Policy Committee (GSE/-) to Technical Committee GSE/20, upon which the following bodies were represented: British Combustion Equipment Manufacturers Association British Gas plc Calor Gas Limited Charte
5、red Institution of Building Services Engineers Chief and Assistant Chief Fire Officers Association Health and Safety Executive Home Office Institution of Gas Engineers Liquefied Petroleum Gas Industry Technical Association (UK) Loss Prevention Council Society of British Gas Industries Amendments iss
6、ued since publication Amd. No.Date of issueComments 6649October 1990Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5990:1990 BSI 07-1999i Contents Page Committees responsibleInside front cover Forewo
7、rdiii 1Scope1 2Definitions1 3Classification of appliances2 3.1By category2 3.2By flue type2 4General requirements2 5General conditions of test2 5.1Test room2 5.2Preparation of appliance for testing2 5.3Test procedure3 6Design and construction3 6.1All appliances3 6.2Appliances designed for permanent
8、outdoor installation5 7Soundness5 7.1General5 7.2Complete assembly6 8Heat input7 8.1Measurement7 8.2Tolerance7 8.3Adjustment7 9Combustion7 9.1Combustion requirements7 9.2Methods of analysis7 9.3Conditions of test8 10Ignition8 10.1Pilot burners and ignition devices8 10.2Ignition performance; burner s
9、ystems with permanent pilots9 10.3Ignition performance: burner system with interrupted or intermittent pilots9 10.4Ignition performance: burner systems employing direct main flame spark ignition9 11Flame stability9 12External temperatures10 12.1Surface temperatures10 12.2Component temperatures10 13M
10、anual gas valves10 14Automatic controls10 14.1General10 14.2Governors10 14.3Gas strainers10 14.4Safety shut-off valves11 14.5Combustion air, pre-purge and post-purge11 14.6Flame supervision system12 14.7Start-gas flame establishment12 14.8Main flame establishment13 14.9Air-gas ratio control13 14.10
11、Thermostats and control of air temperature13 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5990:1990 ii BSI 07-1999 Page 15Motors and fans14 15.1General14 15.2Fan motor temperature14 15.3Lubrication14 15.4Marking14 16Electricity supply1
12、5 17Manufacturers instructions15 17.1General15 17.2Installation instructions15 17.3Servicing instructions16 17.4Users instructions16 18Facilities for commissioning and testing16 19Identification and marking16 19.1General16 19.2Data plate17 19.3Name badge17 19.4Appliance parts17 19.5Electrical data17
13、 19.6Warning notices17 19.7Lighting instructions17 20Air handling18 20.1Air flow rate18 20.2Air flow adjustment18 20.3Profile plate (where fitted)18 20.4Recirculation air18 21Surface heat dissipation18 22Air delivery volume18 23Weather resistance20 Figure 1 Paint scratch test apparatus6 Figure 2 Tes
14、t duct for air flow measurement19 Figure 3 Anti-swirl device20 Figure 4 Air flow regulating device20 Figure 5 Connecting bend21 Figure 6 Arrangement of spray heads and associated piping for rain test22 Figure 7 Details of spray head assembly and construction23 Table 1 Surface temperature rise10 Tabl
15、e 2 Application of safety shut-off valves11 Table 3 Flame supervision device drop-out times12 Table 4 Fan motor windings: permissible temperature rises15 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) B
16、SI BS 5990:1990 BSI 07-1999iii Foreword This British Standard, which has been prepared under the direction of the Gas Standards Policy Committee, replaces BS 5990:1981, which is withdrawn. This edition introduces technical changes to bring the standard up-to-date, by incorporating Amendments 1 and 2
17、 to the 1981 edition and further technical changes to the titles and clauses 14, 15 and 19. It does not reflect a full review of the standard, which will be undertaken in due course. Corresponding requirements for indirect gas-fired forced convection air heaters are specified in BS 5991. Electrical
18、requirements, applicable for both direct and indirect gas-fired forced convection air heaters, are specified in BS 5986. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance wit
19、h 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 to iv, pages 1 to 24, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had ame
20、ndments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrol
21、led Copy, (c) BSI BS 5990:1990 BSI 07-19991 1 Scope This British Standard gives detailed requirements, including safety and performance requirements and methods of test, for direct gas fired forced convection air heaters having heat inputs up to 2 MW, intended for industrial and commercial applicati
22、ons. Appliances covered by this standard are not intended for installation in domestic dwellings. The scope of this standard includes direct gas fired forced convection air heaters for use both with and without ducting, and intended primarily for space heating applications. It therefore includes air
23、 heaters designed to provide make-up air, door curtain heaters, spray booth heaters, portable air heaters and direct fired air heaters capable of providing full space heating. This standard specifies the requirements for direct gas fired forced convection air heaters designed for permanent outdoor i
24、nstallation. It also specifies the requirements for transportable direct gas fired forced convection air heaters. This standard applies to appliances designed to operate on normal low pressure district supplies of 2nd family gas. For appliances fitted with gas boosters, additional requirements may a
25、pply. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard, the following definitions, together with those given in BS 1179 and the relevant installation standards and codes of practice, apply. 2.
26、1 air-gas ratio control a system that automatically controls gas and air flow rates so as to maintain the desired air-gas ratio throughout the heat input range of the appliance 2.2 air temperature control a temperature-actuated control intended to maintain the temperature of the discharged air betwe
27、en specified limits. This is the normal means of air temperature control 2.3 automatic recycling the automatic repetition of the starting up sequence without manual intervention 2.4 burner a combustion system under the control of a single system of safety shut-off valves. An appliance may have more
28、than one burner and a burner may comprise a number of separate nozzles or bars NOTEThis definition differs from that given in BS 1179. 2.5 direct fired forced convection air heater a forced convection air heater in which the products of combustion mix with the heated air being supplied to the space
29、2.6 forced convection air heater an appliance designed to provide space heating from a central source by distributing heated air, by means of an air-moving device, either through ducting or directly into the heated space 2.7 hazardous condition a condition that could result in damage external to the
30、 appliance and/or injury to personnel 2.8 high temperature direct fired forced convection air heater a direct fired forced convection air heater designed to operate with an air temperature rise through the appliance greater than 55 K 2.9 lock-out the safety shut-down condition of a control system su
31、ch that restart cannot be accomplished without manual intervention 2.10 low temperature direct fired forced convection air heater a direct fired forced convection air heater designed to operate with a maximum air temperature rise through the appliance of 55 K or less 2.11 overheat (limit) control an
32、 overheat control is a temperature-actuated device preset and sealed by the manufacturer and designed to protect the appliance and its surroundings in the event of failure of the normal means of temperature control NOTEThis definition differs from that given in BS 1179. 2.12 profile plates adjustabl
33、e plates fitted for the purpose of setting the air flow velocity across the burner Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5990:1990 2 BSI 07-1999 2.13 proved air flow the minimum air flow at which the air proving device indicates
34、 the presence of air flow 2.14 rated heat input the appliance manufacturers declared heat input for the appropriate reference test gas 2.15 safety shut-down the action of shutting off all gas and ignition energy by means of a safety control such that restart takes place only after manual interventio
35、n or automatic recycling 2.16 setting pressure the pressure, measured at the pressure test point, that is specified by the manufacturer for the purpose of adjusting the appliance heat input 2.17 start-gas flame a flame established at the start-gas rate. This may either be a pilot flame or the main b
36、urner flame at reduced rate 2.18 transportable direct fired forced convection air heater a trolley or skid-mounted direct fired forced convection air heater designed to operate with a maximum air temperature rise through the appliance of 55 K or less 3 Classification of appliances 3.1 By category BS
37、 4947 describes the category system of appliance classification in which an appliance is denoted by a category number I, II or III according to the number of gas families that it is designed to burn, these families being identified by subscripts T, N and L for the 1st, 2nd and 3rd families respectiv
38、ely. This standard is concerned with appliances of category IN only. 3.2 By flue type Appliances are also classified according to the flue system for which they are designed and the source of combustion air: This standard is concerned with appliances of type A only. 4 General requirements The applia
39、nce shall comply with the requirements of this standard when tested using the test gases specified for 2nd family gas. Full details of the test gases are given in BS 4947. Appliances submitted for test shall be supplied complete with all ancillary equipment, e.g. air filter, bird screens, etc. neces
40、sary for normal installation and operation. Any new features incorporated in an appliance for which no provision for testing is made in this standard shall not adversely affect the safe and correct operation of the appliance. The new features shall be examined in the light of the manufacturers claim
41、s and instructions. The claims shall be checked against the instructions and shall be valid. Notwithstanding the requirements in this standard, any new designs, materials and methods of assembly are permissible provided that at least equivalent results are achieved. 5 General conditions of test 5.1
42、Test room The test room shall be adequately ventilated but free from draughts that are likely to affect the performance of the appliance. The temperature in the test room shall be maintained at 20 5 C. The air in the test room, and any external air supply, shall contain not more than 1 000 p.p.m. 0.
43、1% (V/V) of carbon dioxide, 10 p.p.m. (0.001% (V/V) of carbon monoxide, 0.5 p.p.m. 0.00005 % (V/V) of nitric oxide or 0.5 p.p.m. 0.00005 % (V/V) of nitrogen dioxide. 5.2 Preparation of appliance for testing The appliance shall be set up in accordance with the manufacturers instructions, with particu
44、lar reference to minimum declared clearances round the appliance. It shall then be adjusted in accordance with the manufacturers instructions using the test gas NGA at an inlet pressure of 17.5 mbar1). type A: flueless appliances type B: open-flued appliances type C: room-sealed appliances type C1:
45、balanced flue appliances type C2: se-duct appliances 1) 1 mbar = 102N/m2 = Pa. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5990:1990 BSI 07-19993 Before any tests are made, the appliance shall be operated at its maximum rated heat inp
46、ut, using normal distributed gas, for a period sufficient to dry any insulation and remove any temporary finish that might interfere with observations. 5.3 Test procedure The appliance shall be examined for gas soundness before and after the tests specified in this standard. The test results shall b
47、e deemed to be invalid unless the gas system is sound. The appliance shall be at room temperature at the start of each test unless the test method specifies otherwise. During testing, the initial adjustment of the appliance shall not be altered unless specifically required by the test method. Precau
48、tions shall be taken to prevent thermostats or other variable controls from acting so as to interfere with the gas flow, except as necessitated by the test. Gas test pressures shall be accurate to within 0.2 mbar and so controlled that the variation does not exceed 0.2 mbar. In general, except for t
49、ests involving governor performance, the appliance governor may be put out of action and the specified test pressure obtained by adjustment of the gas pressure at the inlet to the appliance. The heat input to the appliance shall be determined as specified in BS 4947. 6 Design and construction 6.1 All appliances 6.1.1 Materials, fittings and finishes. The appliance, including all its component parts, shall be soundly constructed and of a high standard of workmanship and finish. Materials shall be of a type, quality and thickness appropria
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