BS EN 1705-1997 Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after an external blow《塑料管道系统 热塑性阀门 经过外部冲击后阀门的完整性试验方法》.pdf

《BS EN 1705-1997 Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after an external blow《塑料管道系统 热塑性阀门 经过外部冲击后阀门的完整性试验方法》.pdf》由会员分享，可在线阅读，更多相关《BS EN 1705-1997 Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after an external blow《塑料管道系统 热塑性阀门 经过外部冲击后阀门的完整性试验方法》.pdf（10页珍藏版）》请在麦多课文档分享上搜索。

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1705 : 1997 BS 2782

2、 : Part 11 : Method 1133C : 1997 The European Standard EN 1705 : 1996 has the status of a British Standard ICS 23.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plastics piping systems Thermoplastics valves Testmethodfortheintegrityof avalveafteranexternalblowBS EN 170

3、5 : 1997 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 May 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee

4、 reference PRI/61 Draft for comment 95/121250 DC ISBN 0 580 27180 3 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/61, Plastics piping systems and compo

5、nents, upon which the following bodies were represented: British Gas plc British Plastics Federation British Plumbing Fittings Manufacturers Association British Valve and Actuator Manufacturers Association Chartered Institution of Water and Environmental Management Department of the Environment (Bri

6、tish Board of Agre ment) Department of the Environment (Building Research Establishment) Department of Transport Electricity Association Health and Safety Executive Institutute of Building Control Institute of Materials Institution of Civil Engineers Institution of Gas Engineers National Association

7、 of Plumbing, Heating and Mechanical Service Contractors Pipeline Industries Guild Plastics Land Drainage Manufacturers Association Society of British Gas Industries Society of British Water Industries Water Companies Association Water Services Association of England and Wales The following bodies w

8、ere also represented in the drafting of the standard, through subcommittees and panels: ERA Technology Ltd. Engineering Equipment and Materials Users Association RAPRA Technology Ltd.BS EN 1705 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii Method Fore

9、word 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test piece 3 6 Procedure 4 7 Test report 4ii BSI 1997 BS EN 1705 : 1997 National foreword This British Standard has been prepared by Technical Committee PRI/61 and is the English language version of EN 1705 : 1996 Plastics pipin

10、g systems Thermoplastics valves Test method for the integrity of a valve after an external blow, published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of testing plastics : Part 11 : Thermoplastics pipes, fittings and valves, as Method 1133C : 1997, f

11、or association with related test methods for plastics materials and plastics piping components. This test method has been prepared for reference by other standards under preparation by CEN for specification of plastics piping and ducting systems and components. It has been implemented to enable expe

12、rience of the method to be gained and for use for other fresh applications. It is also for use for the revision or amendment of other national standards as practicable, but it should not be presumed to apply to any existing standard or specification which contains or makes reference to a different t

13、est method until that standard/specification has been amended or revised to make reference to this method and adjust any requirements as appropriate. Cross-references Publication referred to Corresponding British Standard EN 744 : 1995 BS EN 744 : 1996 Plastics piping and ducting systems Thermoplast

14、ics pipes Test method for resistance to external blows by the round-the-clock method (BS 2782 : Part 11 : Method 1108C : 1996) EN 28233 BS EN 28233 : 1992 Thermoplastics valves Torque Test method (BS 2782 : Part 11 Method 1131 : 1992) NOTE 1. In the descriptors, the term driving squares is irrelevan

15、t: it appears to be a mistranslation of a French descriptor for closing torque. The term cocks should be read as valves. NOTE 2. For consistency, the term closing torque used, only , in 6.5 should be read as stop torque as used in 6.3 and in item b) in the note to clause 3. Warning note. This Britis

16、h Standard, which is identical with EN 1705 : 1996, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained pers

17、onnel. In particular, it is the opinion of UK Technical Committee PRI/61 that the method as written gives test conditions known to be appropriate and required for some applications, including polyethylene valves for gas distribution. For testing of valves of more brittle materials and/or intended fo

18、r other applications, the test conditions may be inappropriate, e.g. conditioning to220 C as required for 6.1.3 and 6.1.4, The Technical Committee therefore draws particular attention to clause 3 and the note thereto, including item c), and to the notes which follow 6.1.5 and 6.6. Compliance with a

19、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, the EN title page, pages 2 to 4, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe e

20、n de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN 1705 : 1996 E EUROPEAN STANDARD EN 1705 NORME EUROPE ENNE EUROPA ISCHE NORM November 1996 ICS 23.060.00 Descriptors: Plastic tubes, cocks,

21、 thermoplastic resins, driving squares, tests, impact tests, verification, torque English version Plastics piping systems Thermoplastics valves Test method for the integrity of a valve after an external blow Syste mes de canalisations en plastique Robinets thermoplastiques Me thode dessai pour la ve

22、 rification dun robinet apre s un choc externe Kunststoff-Rohrleitungssysteme Thermoplast-Armaturen Pru fverfahren der Unversehrheit einer Armatur nach a uerer Schlagbelastung This European Standard was approved by CEN on 1996-10-27. CEN members are bound to comply with the CEN/CENELEC Internal Regu

23、lations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This E

24、uropean Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the n

25、ational standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1705 : 1996 BSI 1997 Foreword This European Standard has been prepared by Technical Com

26、mittee CEN/TC 155, Plastics piping systems and ducting systems, the secretariat of which is held by NNI. The material-dependent parameters and/or performance requirements are incorporated in the System Standard(s) concerned. This standard is one of a series of standards on test methods which support

27、 System Standards for plastics piping systems and ducting systems. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 1997, and conflicting national standards shall be withdrawn at the latest by

28、May 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,

29、 Spain, Sweden, Switzerland and the United Kingdom.Page 3 EN 1705 : 1996 BSI 1997 1 Scope This standard specifies a method for determining the leaktightness and the ease of operation of a valve following an impact applied to the operating mechanism (cap) or other exposed mechanism. 2 Normative refer

30、ences This standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to, or revisions of, any of these publ

31、ications apply to this standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 744 : 1995 Plastics piping and ducting systems - Thermoplastics pipes - Test method for resistance to external blows by the roun

32、d-the clock method EN 28233 Thermoplastics valves - Torque - Test method 3 Principle The operating cap or other exposed mechanism of an assembled valve is struck once by a falling weight under specific conditions onto its most critical position, i.e. the position on a valve of any given design most

33、likely to impair its performance (see 6.1.4). The valve is then tested for any effects on its operating torque, strength of the stop mechanism and leaktightness. Unless otherwise specified in the referring standard, the test temperatures are220C and +40C. NOTE. It is assumed that the following test

34、parameters are set by the standard making reference to this standard: a) the impact test parameters, including; the mass of the falling weight (see 4.2); the geometry of the striker (see 4.2); the height of the fall of the striker (see 6.1); b) maximum stop torque (see 6.3 and 6.5); c) if applicable

35、, the test temperature(s) (see clause 3). 4 Apparatus 4.1 A clamping fixture, with a means of clamping the valve at both outlets to a base which is rigid and moveable. 4.2 A falling weight testing machine, conforming to EN 744, with the testing parameters as specified by the referring standard. 4.3

36、A device, for measuring the operating torque of the valve and the strength of the stop mechanisms. 4.4 A temperature-controlled environment, maintained at (220 2) C. 4.5 A temperature-controlled environment, maintained at (40 2) C. 4.6 A temperature-controlled water bath, maintained at (20 2) C. 4.7

37、 Other equipment, as follows: a) a compressed air supply capable of maintaining the specified pressure (see 6.6); b) a pressure measurement device, capable of checking conformity to the specified pressure (see 6.6); c) a temperature measurement device(s) capable of checking conformity to the tempera

38、tures specified in 4.4, 4.5, 4.6, 6.1, 6.2, 6.4 and 6.6; d) end-closures connected to the ends of the valve, allowing, by means of an appropriate system, sealing and connecting to the pressurizing equipment. 5 Test piece The test piece shall comprise a valve, in the as-manufactured condition, comple

39、te with operating cap or other mechanism and end-closures (see 4.7).Page 4 EN 1705 : 1996 BSI 1997 6 Procedure 6.1 General 6.1.1 Measure and record the opening and closing torques of the valve in accordance with EN 28233. 6.1.2 Mount the valve in the clamping fixture (4.1)s o that when tested in acc

40、ordance with 6.1.4 the striker will impact upon the position on the valve mechanism most likely to impair its performance. Set the falling weight testing machine so that the height of fall of the striker to the point of contact with the valve mechanism (see 6.1.4) will be as specified (see note to c

41、lause 3). 6.1.3 Place the valve and fixture assembly in the temperature-controlled environment and condition it at (220 2) C for a minimum of 2 h. 6.1.4 Remove the valve and fixture assembly from the temperature-controlled environment. Within 30 s position the assembly in the testing machine and rel

42、ease the falling weight so that the striker falls onto the applicable point of the valve operating mechanism (see 6.1.2). 6.1.5 Inspect the test piece visually for and record the details of the position and appearance of any evidence of cracking after impact. NOTE. Attention is drawn to the need to

43、contain the possible effects of failure of components subjected to impact testing or destructive testing. 6.2 Assessment of operating torque at220 C Following the impact test recondition the valve at (220 2) C for a minimum of 2 h. Measure and record the opening and closing torques in accordance wit

44、h EN 28233. 6.3 Assessment of the resistance of the stop mechanism at220 C Immediately following testing in accordance with 6.2, apply the maximum stop torque, as specified by the referring standard, to the valve in the open and closed positions. Record any evidence of damage and/or malfunction. 6.4

45、 Assessment of operating torque at 40 C Following testing in accordance with 6.2 and 6.3, recondition the valve at (40 2) C for a minimum of 24 h. Measure and record the opening and closing torque in accordance with EN 28233. 6.5 Assessment of the resistance of the stop mechanism at 40 C Immediately

46、 following testing in accordance with 6.4, apply the maximum closing torque, as specified by the referring standard, to the valve in the open and closed positions. Record any evidence of damage and/or malfunction. 6.6 Assessment of external leaktightness Following testing in accordance with 6.5, con

47、nect the valve to the pneumatic pressure source see item a) of 4.7 and condition it in a water bath at (20 2) C for a minimum of 12 h. With the valve in the half-open position pressurize the valve pneumatically to at least 6 bar. Maintain this pressure for at least 1 h while monitoring it for, and r

48、ecording, any signs of external leakage. NOTE. Attention is drawn to the need to contain the possible effects of failure of components subjected to impact testing or destructive testing. 7 Test report The test report shall include the following information: a) the reference to this standard and to t

49、he referring standard; b) a full identification of the product, including manufacturer and production date; c) the test temperatures; d) the values of opening and closing torques measured prior to impact (see 6.1), and following impact at both220 C and 40 C (see 6.2 and 6.4), and a description of any visible evidence of cracking after impact (see 6.1); e) the torque applied to the operating stop mechanisms and any signs of consequent damage or malfunction; f) the results of