BS ISO 13592-1998 Small craft - Backfire flame control for petrol engines《小型飞机 汽油发动机用回火火焰控制器》.pdf

1、BRITISH STANDARD BS ISO 13592:1998 Small craft Backfire flame control for petrol engines ICS 47.020.20; 47.080BSISO13592:1998 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on

2、 15 July 1998 BSI 04-1999 ISBN 0 580 30096 X National foreword This British Standard reproduces verbatim ISO13592:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee GME/33, Small craft, which has the responsibility to: aid

3、 enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UKinterests informed; monitor related international and European developments and promulgate them in the UK. A list of organizatio

4、ns represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Cor

5、respondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. 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

6、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, theISO title page, pages ii to iv, pages1 to4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpo

7、rated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date Comments BSI 04-1999 i BSISO13592:1998 Contents Page National foreword Inside front cover Foreword iii Text of ISO 13592 1ii blankBSISO13592:1998 ii BSI 04-1999 Contents

8、Page Foreword iii 1 Scope 1 2 Normative reference 1 3 General requirements 1 4 Testing 1 5 Physical examination 1 6 Test procedure 2 7 Marking 4 8 Engine operation manual 4 Figure 1 Explosion test apparatus 3BSISO13592:1998 BSI 04-1999 iii Foreword ISO (the International Organization for Standardiza

9、tion) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be

10、represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International St

11、andards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by atleast75% of the member bodies casting a vote. International Standard ISO13592 was prepared by Technical Committee ISO/TC188, Small craft.iv blan

12、kBSISO13592:1998 BSI 04-1999 1 1 Scope This International Standard specifies the minimum requirements for construction and testing of engines and devices to prevent the propagation of backfire flames from permanently installed inboard petrol engines to the surrounding atmosphere in small craft of le

13、ngth of the hull up to and including24m. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, this publication do not ap

14、ply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of I

15、SO and IEC maintain registers of currently valid International Standards. ISO 9227:1990, Corrosion tests in artificial atmospheres Salt spray tests. 3 General requirements 3.1 Petrol engines shall be designed to prevent, or be equipped with a device to prevent, the propagation of backfire flame from

16、 within the engine air intake system to the surrounding atmosphere. 3.2 Where backfire flame propagation is prevented by means of a flame arrester consisting of one or more component parts, this device shall a) provide access for inspection and cleaning; b) have no openings in the arrester or its co

17、nnection to the air induction system through which a backfire flame can pass; c) be constructed so that component parts cannot be misaligned during assembly or installation to an extent that will impair its effectiveness; d) include a permanent and prominent means of identification as described in 7

18、 e) provide means of securely fastening both the flame arrester to the air intake and the component parts to each other. When clamps are used, they shall be affixed to one of the major component parts in such a manner that they cannot be easily removed, and no springs shall be used for the purpose

19、of clamping. 3.3 A flame arrester adapter, if required, shall a) provide for direct attachment to the air induction system; b) be attached permanently to the flame arrester. Examples of permanent attachment would be bond, weld, rivet or threaded fastener with thread upset after assembly. No loose pi

20、eces shall be used between the flame arrester and the engine air inlet that could be left out. 3.4 For each design of an engine incorporating a backfire flame control, the air and fuel induction system shall be capable of meeting the requirements in this International Standard. Where a particular de

21、sign of the engine air and fuel induction system consists of variations so that it may be utilized in similar engines of a particular manufacturer, these variations shall also be in conformity with the requirements of this International Standard. A change in the design or construction of an engine a

22、ir and fuel induction system that was capable of complying with these requirements shall be re-evaluated and retested when appropriate. 4 Testing 4.1 Each design of the flame arrester shall be tested to determine conformity with this International Standard. 4.2 Where a particular design consists of

23、various combinations of parts, three sample assemblies need to be tested; they shall be representative of the flame-arresting performance of the cross-section of assemblies of the design. 4.3 The test of the samples representative of each design shall conclusively indicate that, when such backfire f

24、lame arresters are subjected to the test procedures of 6.1 to 6.4, the design prevents propagation of the backfire flame to the surrounding atmosphere without failure, damage or permanent deformation. 4.4 A change in the design or construction of an arrester that has passed tests as specified in 6.1

25、 to6.4 requires that the arrester be retested if the change cannot be considered and accepted under4.2. 5 Physical examination The backfire-flame-arrester assembly together with a stock carburettor designed to be used, or the engine air and fuel induction system, shall be examined for compliance wit

26、h the following requirements of this International Standard.BSISO13592:1998 2 BSI 04-1999 5.1 Inspect all submitted samples for evidence of imperfections and consistency with production drawings. 5.2 Inspect the assembly to confirm that the flame arrester or induction system can be inspected and cle

27、aned in service. 5.3 Inspect the assembly as installed for the existence of any possible by-pass openings, such as fasteners and joints. 5.4 Verify that the fasteners of the assembly are permanently secured. 5.5 Verify that the component parts can only be assembled properly, and without misalignment

28、 on the engine. 6 Test procedure The devices or systems shall withstand the effects of each of the following tests without failure. NOTEA new item may be used for each test. 6.1 Vibration test The backfire flame arrester or system assembly used for this test shall be mounted on a stock carburettor

29、or induction system, or simulated carburettor or induction system, for the type of assembly used in service secured by a rigid adapter directly to the surface of the vibration table in its normal operating position. The carburettor and backfire-flame-arrester assembly or induction system shall be su

30、bject to24h of vibration, with8h in each of the x, y and z planes, at a peak-to-peak amplitude of1,00mm 1,05mm. The test set-up shall be automatically cycled at a gradually increased and decreased rate between10Hz and60Hz every four minutes. 6.2 Shock test The set-up used for the vibration test shal

31、l be used for this test including the test fixture, carburettor and backfire-flame-arrester assembly or induction system. Securely mount the set-up to the surface of a shock machine. Subject it to 5000 vertical impacts of98m/s 2(10g), having a shock duration of20ms2ms measured at the zero reference

32、line of a half-sine shock pulse. 6.3 Explosion test The backfire flame arrester assembly and carburettor or the engine air and fuel induction system used for the vibration and shock tests shall be used for this test and be subjected to50test repetitions. The backfire-flame-arrester assembly or induc

33、tion system shall be attached to the test stand as shown in Figure 1 in a manner simulating a normal installation. An engine may be used in place of the lower chamber of the test stand for testing induction systems. Prior to the tests, the carburettor or induction system shall be carefully checked f

34、or any openings that could permit flame passage, and all throttle and choke butterflies shall be locked in the full open position. Other carburettor or induction system openings, such as fuel line, vacuum advance connections, etc., shall be sealed. Where provisions are made on the backfire flame arr

35、ester assembly or induction system for the connection of oil-breather tubing, such lines shall be left disconnected during the tests. Using whatever adapter may be required, the carburettor with the attached backfire flame arrester assembly or the induction system shall be secured directly to the up

36、per end of a chamber, to be referred to as the lower chamber with an internal bore of50mm 2mm and a length of600mm 10mm according to Figure 1. The lower chamber shall be closed at the lower end (see Figure 1). The method of attachment between the flame arrester and the carburettor or induction syste

37、m shall be in accordance with the manufacturers requirements. The carburettor or induction system shall be directly and fully open to the lower chamber, with no restriction to gas flow. For evaluation of induction systems, an engine can be used in place of the lower chamber, with alterations to intr

38、oduce the combustible mixture and ignition source. 6.3.1 In accordance with Figure 1, a provision shall be made at the base of the lower chambers for the introduction of a premixed propane gas/air mixture. The mixing of the propane and air shall not be accomplished within the chamber. The propane/ai

39、r explosive mixture used for these tests shall be generated through the use of flow meters and a suitable premixing chamber, designed and arranged so that a controlled homogenous explosive mixture is fed up to the lower chamber for a flame arrester and to the upper and lower chambers for an air indu

40、ction system during all tests. A suitable control valve shall be provided at the gas/air inlet fitting to permit immediate extinguishing of the mixture, should it continue to burn after ignition. Flame arresters shall be provided in all connecting fittings between the explosion chamber and mixing ch

41、amber to prevent effective flame propagation through the lines to the mixing chamber.BSISO13592:1998 BSI 04-1999 3 Figure 1 Explosion test apparatusBSISO13592:1998 4 BSI 04-1999 6.3.2 Two spark plugs, set with a gap of0,7mm 0,8mm, shall be provided at the base of the lower chamber directly adjacent

42、to the gas/air inlet fitting. A dual ignition system capable of simultaneously firing both spark plugs with a minimum peak voltage of25000V shall be provided. A similar spark plug shall be provided in the upper chamber. 6.3.3 An upper chamber with a minimum volume of25L shall be provided around the

43、flame arrester or engine air and fuel induction system during all the tests. At least one side of the upper chamber shall be made of transparent plastic to permit good observation of the backfire-flame-arrester assembly or induction system at the time of ignition. A hinged cover or flexible flap sha

44、ll be installed at the top of the upper chamber to provide pressure relief (see Figure 1). 6.3.4 The instrumentation shall include the following: a) gas analyser for monitoring the propane/air mixture in the upper and lower chambers; b) pressure transducer in the lower chamber with an amplifier and

45、oscilloscope to monitor the relative severity of each test explosion; c) flow meters to monitor the gas and air flow rates. 6.3.5 The tests shall be conducted in accordance with the following procedure. a) Before initiating the tests, the flow of propane and air shall be adjusted so as to provide th

46、e mixture that, when ignited, produces the maximum explosive pressure recorded in the lower chamber. b) When this mixture is present in both the lower and upper chambers, the mixture in the lower chamber shall be ignited. The maximum pressure of each explosion in the lower chamber shall be recorded.

47、 c) 50 valid test explosions shall be conducted at not less than80% of the maximum explosive pressure recorded according to a). d) After the mixture in the lower chamber has been ignited, the spark plug in the upper chamber shall be fired to verify the existence of an explosive mixture in the upper

48、chamber. e) Following each test, the upper and lower chambers shall be purged of all unburned gases and the next test conducted. 6.3.6 There shall be no ignition of the propane/air mixture in the upper chamber as a result of the explosion in the lower chamber in each of fifty consecutive valid tests

49、 6.3.7 The following are invalid tests that must be repeated: a) any test explosion of less than80% of maximum pressure; b) any test when the upper chamber fails to ignite after firing the upper spark plug. 6.4 Corrosion test The backfire flame arrester assembly or air and fuel induction system shall be exposed to a neutral salt spray (NSS) test for a period of240h, defined as the NSS test in ISO9227:1990, subclause 5.1. After the test, the flame arrester must be cleaned and be capable of passing the physical examination specified in 5.3, 5.4 and 5.5. 7 Ma