1、BRITISH STANDARD Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after temperature cycling under bending The European standard EN 1704 : 1997 has the status of a British Standard ICs 23.060.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIG
2、HT LAW BS EN 1704 : 1997 BS 2782 : Part 11 : Method 1133B : 1997 STDOBSI BS EN 1704-ENGL 1997 = LbZiibbS Ob200bL b22 Amd. No. BS EN 1704 : 1997 Date Text a?fectd Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRV61, Plas
3、tics piping systems and components, 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 Dep
4、artment of the Environment (British Board of Agrement) Department of the Environment (Building Research Establishment) Department of ?kansport Electricity Association Hdth and Safety Executive Institute of Building Control Mtute of Materials Institution of Civil Engineers Institution of Gas Engineer
5、s National Association of Plumbing, Heating and Mechanical Services Contractors F?ipeljne Industries Guild Plastics Land Drainage manufacture Association Society of British Gas Industries Society of British Water industries Water Companies Association Water Services Association of Engiand and Wales
6、The following bodies were represented in the drafting of this standard, through subcommittees and panels: ERA Technology Ltd. Engineering Equipment and Materiais Users? Association RAPm Technology Ltd. This British Standard, having been prepared under the irection of the Sector Board for Materials a
7、nd Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 1997 O BSI 1997 The following BSI references relate to the work on this standard Committee reference PRI61 Draft for comment 95/120948 DC ISBN O 680 27378 4 STD-BSI BS EN 17CILi-ENGL 1977 = lb2Lib
8、b7 Ob200b2 5b7 = BS EN 1704 : 1997 Contents Conunittees responsible National foreword page inside front cover ii Foreword 2 Method 1 scope 2 Normative references 3 principle 3 3 3 4 Apparatus 3 6 Testpieces 3 6 Procedure 4 7 Testreport 4 Figure 1 Schematic arrangement for bending radius test 5 O ES1
9、 1997 1 STD=BSI BS EN L704-ENGL 1997 Lb24bb9 Ob200b3 4T5 M BS EN 1704 : 1997 National foreword This British standard has been prepared by Technid Committe PW61 and is the English ianguage version of EN 1704 : 1996 Plastics piping systems - ThemLoplastics values - Test method for ULe integrity of a b
10、) the number of test pieces to be tested in each configuration (see clause 6); c) the lower andor upper cycle temperatures, if not as given in 6.3; d) the number of cycles (see 6.4). 4 Apparatus 4.1 A bending frame, capable of producing a constant bending radius of 25 b) a compressed air supply, var
11、iable up to at least 6 bar (see 6.9); c) a manometer, with a range of O mbar to 50 mbar (class 0,6 or better conforming to EN 837-1); d) a thermometer capable of checlung conformity to the temperature(s) specified in 4.2 andor 6.3, as appropriate; e) end closures connected to the ends of the valve,
12、allowing, by means of an appropriate system, sealing and connecting to the presswising equipment By means of an appropriate system, both end closures shail allow sealing, connection to pding equipment and venting (see 6.10 and 6.12). 5 Ilest pieces 6.1 Preparation 6.1.1 Wo test pieces shall be prepa
13、red as assemblies as follows. The valve shail be assembled between two pipes of the same d, as the valve and of sufficient length to provide a span of at least 10 when the applicable bending radius is achieved (see 5.1.2), as shown in figure 1. The free ends of the pipes shall be fitted with closure
14、s conforming to e) of 4.4. If a pipe is to be connected to the valve by fusion, the materiai of the pipe shall conform to the same MRSclass as the materiai of the valve. 6.1.2 One test piece, with the valve fully closed, shall be held in a bending frame (4.1), with the valve spindle in the plane of
15、bending and the operang cap in the outer circumference as shown in fgure 1. The assembly shall be put into the bending frame in such a way that a constant bending radius is assured Unies otherwise specified in the referring standard, the radius shall be 25 d) the vaues of the opening and closing tor
16、ques measured prior to, and foliowing, temperature e) result of the leaktightness tests (see 6.8,6.9, 6.11 and 6.12); f) any fadors which may have affected the resuits, such as any incidents or any operating details not specified in this -dar g) the date of test Cycling at both -20 “C and +40 OC; Q
17、BSI 1997 STD*BSI BS EN 170q-ENGL 1717 m lbZlbb9 Ob200bB TA7 m Page 6 EN 1704 : 1997 10 d, I c Figure 1. Schematic arrangement for bending radius test * * IB O BSI 1997 List of references See national foreword. 0 BSI 1997 BS EN 1704 : 1997 BS 2782 : Part 11 : Method 1133B : 1997 BSI 389 Chiswick High
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