1、BRITISH STANDARD BS6047-1: 1981 Flame supervision devices for domestic, commercial and catering gas appliances Part1: Specification for heat sensitive type UDC 683.955:62-524BS6047-1:1981 This British Standard, having been prepared under the directionof the Gas StandardsCommittee, waspublished under
2、 the authorityof the Executive Boardand comes into effect on 27February1981 BSI11-1999 The following BSI references relate to the work on this standard: Committee reference GSE/22 Draft for comment77/73412DC ISBN 0 580 11807 X Cooperating organizations The Gas Standards Committee, under whose direct
3、ion this British Standard was prepared, consists of representatives from the following: British Combustion Equipment Manufacturers Association* British Gas Corporation* Chartered Institution of Building Services Department of Energy (Gas Standards)* Department of the Environment (Housing and Constru
4、ction) Department of the Environment (PSA) Heating and Ventilating Contractors Association Institution of Gas Engineers Liquefied Petroleum Gas Industry Technical Association (UK) National Association of Plumbing, Heating and Mechanical ServicesContractors National Gas Consumers Council Society of B
5、ritish Gas Industries Water-tube Boilermakers Association The organizations marked with an asterisk in the above list, together with thefollowing, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Association of Control Manufacturers Tacma
6、(BEAMA) British Industrial Measuring and Control Apparatus ManufacturersAssociation British Non-ferrous Metals Federation Chief and Assistant Chief Fire Officers Association National Brassfoundry Association Amendments issued since publication Amd. No. Date of issue CommentsBS6047-1:1981 BSI 11-1999
7、 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Design and construction 1 5 Performance 5 6 Marking and information 8 7 Packaging 8 Appendix A Recommended requirement for flame supervision device applications 9 Figure 1 Bending mom
8、ent test (schematic) 9 Figure 2 Paint scratch test apparatus 10 Table 1 Torque and bending moment values 4 Publications referred to Inside back coverBS6047-1:1981 ii BSI 11-1999 Foreword This British Standard has been prepared under the direction of the Gas Standards Committee to meet the need for a
9、 standard covering the safety and performance of flame supervision devices of the heat sensitive type up to DN25 connection size for non-automatic domestic, commercial and catering appliances burning2nd and3rd family gases. During the last decade there has been a progressive change from1st to2nd fam
10、ily gas and hence1st family gas is not referred to in this standard due to its greatly diminished use in the United Kingdom. However, present day appliances are often designed to burn2nd and3rd family gases and consequently the requirements appropriate to both these gases have been included. In acco
11、rdance with current practice, quantities given in this standard are expressed in metric (SI) units. Information on the SI system will be found in BS3763. This standard is not intended to prejudice the negotiation of a European standard and will be withdrawn in favour of such a standard as soon as on
12、e, acceptable to the UK, is approved. 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 with a British Standard does not of itself confer immunity from legal obligations. Sum
13、mary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to10, 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 fron
14、t cover.BS6047-1:1981 BSI 11-1999 1 1 Scope This British Standard specifies the requirements for flame supervision devices of the heat sensitive type, hereinafter referred to as flame supervision devices, up to R1(DN25) connection size inclusive for non-automatic domestic, commercial and catering ap
15、pliances burning2nd or3rd family gases with an input rating up to120kW. It also applies to the flame supervision device used in conjunction with other control devices forming a control system on appliances. A flame switch, i.e.a device in which the presence or absence of a flame makes or breaks an e
16、lectrical circuit directly or indirectly, is not considered to be a flame supervision device for the purposes of this standard. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Definitions For the purposes of this British Standard the fo
17、llowing definitions apply. Definitions of other terms are to be found in BS1179. 3.1 flame sensing element the part of a flame supervision device on which the supervised flame acts directly, and which transmits the flame effect directly or indirectly on to a valve 3.2 flame sensor the active part of
18、 the flame sensing element, as specified by the manufacturer 3.3 flame supervision burner a burner the flame of which acts on the flame sensing element 3.4 flame supervision device a device responsive to flame properties that detects the presence of flame and, in the event of ignition failure or sub
19、sequent loss of flame, causes safety shut-down 3.5 flame supervision device of heat sensitive type a flame supervision device that responds to flame temperature, and directly causes safety shut-down 3.6 ignition interlock that part of a flame supervision device which prevents the operation of the ig
20、niter as long as the main gasway is open 3.7 restart interlock that part of a flame supervision device which prevents the re-opening of the valve during the closing time of the device 4 Design and construction 4.1 General 4.1.1 Notwithstanding the requirements specified in this standard, any new des
21、igns, materials and methods of assembly giving at least equivalent results may be considered as complying with this standard when approved by a representative and recognized authority. 4.1.2 Any new features incorporated for which no provision for testing is made in this standard shall be examined a
22、nd approved by a recognized and representative authority in the light of the manufacturers claims. 4.1.3 Flame supervision devices shall be so designed and constructed, and be of such materials, that in normal use they shall function reliably, cause no danger to persons or danger to the surroundings
23、 and be fail-safe. 4.1.4 Removal of the energizing source or failure of the flame sensing element shall result in the direct closure of the valve in the flame supervision device within the closing time declared by the manufacturer(see5.8). 4.2 Materials for gas-carrying parts. Parts of the body whic
24、h directly or indirectly separate a gas carrying chamber from the atmosphere shall be made of either a) metallic material; or b) non-metallic material provided that, upon removal or fracture of this non-metallic part, under no circumstances shall more than30dm 3 /h of air escape when tested with air
25、 at the declared maximum operating pressure. Notwithstanding this requirement “O” ring seals complying with the requirements of BS1806 or BS4518 and jointing materials complying with the requirements of BS5292 are permitted. Solder that has a melting point below450 C after application shall not be u
26、sed for gas-carrying parts.BS6047-1:1981 2 BSI 11-1999 4.3 Zinc alloys. Zinc alloys shall be used only if a) they comply with all the requirements of BS1004; b) the casting is manufactured in accordance with the recommendations of BS5338; c) the parts will not be subjected to a temperature higher th
27、an80 C; d) for gas-carrying parts and parts which could affect the safe operation of the device, only alloy A is used. 4.4 Accessibility. Components designed to be serviced during normal use shall be easily accessible and shall be so manufactured that parts cannot readily be incorrectly reassembled.
28、 4.5 Noise. The entire device shall not be unduly noisy when opening, closing or in continuous use. 4.6 Tubing. Pilot tubing shall be confined to two sizes, namely4mm and6mm outer diameter conforming to dimensions quoted in BS2871-2, but may be of any suitable metal. Copper tubing shall not be used
29、where the ambient temperature exceeds100 C. 4.7 Operation 4.7.1 The torque required to operate any spindle directly by hand shall not exceed0.6Nm when the spindle is turned at an angular velocity of rad/s. (See Appendix A.) 4.7.2 The force or pressure required to operate a push button directly by ha
30、nd shall not exceed30N for nominal valve sizes of less than DN15 and, for nominal valve sizes of DN15 to DN25,45N or0.5N/mm 2 , whichever is the smaller value. No push button shall be less than40mm 2in area or7mm in diameter. 4.8 Electrical construction. Any electrical construction of the control sh
31、all comply with the relevant requirements of BS3955-3, except for any thermoelectric circuitry. If snap-on connectors are used they shall comply with the requirements of BS5057 and be of sizes2.8mm and/or6.3mm. 4.9 Assembly and workmanship 4.9.1 Castings shall be visibly free from laps, blow holes a
32、nd pitting, and both the external and internal surfaces shall be clean and smooth. They shall be neatly dressed, and shall not be burned, plugged, stopped or patched. This does not exclude accepted methods of impregnation of castings (e.g.vacuum impregnation). 4.9.2 Hot-pressed components shall be s
33、ound, homogeneous, without laminations and shall be smooth and well finished. 4.9.3 The device shall be free from sharp edges which might cause personal injury or damage to other components, electrical wiring, etc. 4.9.4 The device shall not contain dirt, casting sand, swarf or other foreign matter.
34、 There shall be no excess dressing, jointing compound, or insulation varnish, which could cause failure or otherwise interfere with the safety and performance of the device. 4.9.5 Holes used in the assembly of the device, e.g.for fixing screws, shall not be closer than1mm to gasways. 4.9.6 Holes com
35、municating with gasways and used for manufacturing purposes shall be closed mechanically with a metallic seal so as to ensure a gas-tight seal for the life of the device and shall be treated in such a way that unauthorized interference can be detected. 4.10 Non-metallic materials 4.10.1 General. Non
36、-metallic materials shall not be affected by their specified working environment so as to interfere with the safe operation of the device. 4.10.2 Leather diaphragms. Leather diaphragms and any leather associated with the valve bob in the form of bob cover shall be of good quality “East Indian” sheep
37、-skin free from flaying defects and serious imperfections of grain and shall generally be in accordance with BS2797. All leather shall be similarly treated to ensure flexibility, soundness and a reasonable life and shall be suitably dressed (e.g.with a double refined straight mineral oil of kinemati
38、c viscosity183cSt 1)at60 C). 4.10.3 Sealing gaskets and jointing compounds. Sealing gaskets, jointing compounds and any other sealing agent, shall form an effective seal and shall comply with the appropriate section of BS1806, BS4518 or BS5292. 4.10.4 Sealing materials and diaphragms in contact with
39、2nd family gas. 4.10.4.1 Requirement. The device shall comply with the requirements of4.10.4.2, and additionally, if declared by the manufacturer to be suitable for use in ambient temperatures below0 C, the device shall comply with the requirements of4.10.4.3. 1) 1cSt=1mm 2 /s.BS6047-1:1981 BSI 11-1
40、999 3 4.10.4.2 Test on the assembled device. The device shall be exposed for a period of264h to NGA gas, nitrogen, or air, at a temperature of20 1 C 2) . This gas shall be saturated to35 2% with toluene vapour and shall have a relative humidity of65 5%. During the test the flow rate shall not be les
41、s than30dm 3 /h. The test shall be so arranged that any “working” diaphragm or valve pad operates in the normal mode and over the full stroke at least5000times at a rate of20cycles/h. Other devices shall be maintained in their normal operating state. After the exposure period the device shall contin
42、ue to function correctly and shall comply with the requirements of5.3, 5.4 and5.5. Where the nominal size of the device is less than R# (DN20) the device shall also comply with the requirements of5.7.1. In addition, the device shall be observed to operate correctly over its full range of nominal wor
43、king pressures, the voltage range of rated voltage+10%15%, and under any combination of these conditions, but with the ambient temperature maintained at20 1 C. NOTEThe initial performance of the device has to be determined on the carrier gas prior to adding toluene. 4.10.4.3 Test on the materials. A
44、 test sample shall be cut from the component, immersed and allowed to swell freely in a solution of test liquid B, as specified in BS903-A16, for a period of168h at an ambient temperature of20 1 C. The volume ratio of liquid to material shall not be less than50:1. After the test, the length of the l
45、iquid-soaked sample shall be measured as quickly as possible. The latter is conveniently carried out by placing the wet sample between two microscope slides. The length of the sample shall not exceed the initial length by more than10%. After drying the sample to constant mass at room temperature, it
46、s mass shall not be less than90% of its initial mass. 4.10.5 Sealing materials and diaphragms in contact with3rd family gases. Diaphragms shall comply with the requirements of3.3 1) and3.3 6) of BS3016:1972. Valve pads shall comply with the requirements of3.4 1),3.4 4) and3.4 5) of BS3016:1972. Non-
47、metallic materials shall show no marked deterioration when subjected to an accelerated ageing test for seven days at a temperature of20 C in excess of the manufacturers maximum recommended temperature. NOTEThe requirements of4.10.5 may not be met by materials made of some silicone rubbers although t
48、hese rubbers are claimed to be satisfactory. Criteria for testing silicone rubber materials are still under consideration and, in the meantime, components and appliances containing such a material will be considered acceptable provided that the appropriate manufacturer can demonstrate that it has pr
49、oved satisfactory in use. 4.11 Corrosion resistance 4.11.1 General requirements. All parts of the device shall have adequate resistance to corrosion, either by the use of corrosion-resistant materials or by means of suitable protective coating, e.g.paint. Moving parts of the device shall be made from corrosion-resistant materials. No part of the device shall corrode to an extent that will affect its safe and correct operation. 4.11.2 Scratch test 4.11.2.1 Requirement. Parts of the device coated for protection and not solely for decoration shall be
