BS EN 1704-1997 Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after temperature cycling under bending《塑料管道系统 热塑料管阀 弯曲情况下温度循环后阀门完整性的试验方法.pdf
《BS EN 1704-1997 Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after temperature cycling under bending《塑料管道系统 热塑料管阀 弯曲情况下温度循环后阀门完整性的试验方法.pdf》由会员分享,可在线阅读,更多相关《BS EN 1704-1997 Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after temperature cycling under bending《塑料管道系统 热塑料管阀 弯曲情况下温度循环后阀门完整性的试验方法.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1704 : 1997 BS 2782
2、 : Part 11 : Method 1133B : 1997 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 COPYRIGHT LAW Plastics piping systems Thermoplastics valves Test method for the integrity of a valve after temperature cyc
3、ling under bendingBS EN 1704 : 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 June 1997 BSI 1997 The following BSI references relate to the work
4、 on this standard: Committee reference PRI/61 Draft for comment 95/120948 DC ISBN 0 580 27378 4 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, Plast
5、ics 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 Depart
6、ment of the Environment (British Board of Agre ment) Department of the Environment (Building Research Establishment) Department of Transport Electricity Association Health and Safety Executive Institute of Building Control Institute of Materials Institution of Civil Engineers Institution of Gas Engi
7、neers National Association of Plumbing, Heating and Mechanical Services 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 W
8、ales The following bodies were represented in the drafting of this standard, through subcommittees and panels: ERA Technology Ltd. Engineering Equipment and Materials Users Association RAPRA Technology Ltd.BS EN 1704 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National
9、foreword ii Foreword 2 Method 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test pieces 3 6 Procedure 4 7 Test report 4 Figure 1 Schematic arrangement for bending radius test 5ii BSI 1997 BS EN 1704 : 1997 National foreword This British Standard has been prepared by Technical Comm
10、itte PRI/61 and is the English language version of EN 1704 : 1996 Plastics piping systems Thermoplastics valves Test method for the integrity of a valve after temperature cycling under bending, published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of
11、testing plastics: Part 11: Thermoplastics pipes, fittings and valves, as Method 1133B : 1997, for 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 specificatio
12、n of plastics piping and ducting systems and components. It has been implemented to enable experience 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 app
13、ly to any existing standard or specification which contains or makes reference to a different test 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
14、British Standard EN 837-1 : 1996 BS EN 837 : 1997 Pressure gauge Part 1: Bourdon tube pressure gauges Dimensions, metrology, requirements and tests EN 28233 BS EN 28233 : 1992 Thermoplastics valves Torque Test method EN 45501 : 1993 BS 2782 : Part 11 : Method 1131 : 1992 BS EN 45501 : 1994 Specifica
15、tion for metrological aspects of non-automatic weighing instruments NOTE 1. In the descriptors, the term cocks should be read as valves. NOTE 2. In 4.1, the specification of the bending frame given in the first paragraph corresponds to that for testing a length of pipe under bending, for which a con
16、stant bending radius can be achieved. This cannot be achieved for a test piece in which a significant portion comprises a relatively stiff valve body. It is necessary therefore to interpret figure 1 as requiring displacement of the valve body by the specified radial distance from its position betwee
17、n two straight pipes before bending is applied. Depending on the relative lengths and stiffness of the valve body and the two adjacent pipes which complete the span shown in figure 1, the radius of bending of the actual pipes may differ from and cannot be expected or required to conform to a constan
18、t radius of 25d n . NOTE 3. In 4.1, reference has been introduced to a specific classification in accordance with EN 45501, which should therefore have been listed as a dated reference in clause 2. NOTE 4. In 5.1.1, reference has been introduced to the MRS-class of the materials of the pipes and the
19、 valve, without reference to the basis thereof. The Technical Committee considers this to be a reference to the classification number according to EN ISO 12162 : 1995 (” BS EN ISO 12162 : 1996 and BS 2782 : Part 11 : Method 1121 : 1996) Warning note. This British Standard, which is identical with EN
20、 1704 : 1997, 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 personnel. In particular, it is the opinio
21、n 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 for other applications, the test conditi
22、ons may be inappropriate, e.g. conditioning to2 20 C as required for 6.3 and 6.6. The Technical Committee therefore draws particular attention to clause 3 and the note thereto, including item c), and to the note which follows 6.9. Compliance with a British Standard does not of itself confer immunity
23、 from legal obligations. Summary of pages This document comprises a front cover, and inside front cover, pages i and ii, the EN title page, pages 2 to 6, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Norm
24、ung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 Copyright reserved to CEN members Ref. No. EN 1704 : 1997 E EUROPEAN STANDARD EN 1704 NORME EUROPE ENNE EUROPA ISCHE NORM January 1997 ICS 23.060.00 Descriptors: Plastic tubes, cocks, thermoplastic resins, leak tests, bend tests, ther
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