1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 917 : 1997 BS 2782
2、: Part 11 : Methods 1134A and B : 1997 The European Standard EN 917 : 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 methods for resistance to internal pressure and leak
3、tightnessBS EN 917 : 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 July 1997 BSI 1997 The following BSI references relate to the work on this s
4、tandard: Committee reference PRI/61 Draft for comment 92/47741 DC ISBN 0 580 27385 7 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
5、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 Environment Management Department of the E
6、nvironment (British Board of Agre ment) Department of the Environment (Building Research Establishment) Department of Transport Elecricity Association Health and Safety Executive Institute of Building Control Institute of Materials Institution of Civil Engineers Institution of Gas Engineers National
7、 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 Wales The follo
8、wing bodies were also 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 917 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword i
9、i Foreword 2 Method 3 1 Scope 2 Definitions 3 3 Method A: Long-term pressure test 3 4 Method B: Leaktightness test (seat and packing test) 4 Annex A (informative) Bibliography 6ii BSI 1997 BS EN 917 : 1997 National foreword This British Standard has been prepared by Technical Committee PRI/61 and is
10、 the English language version of EN 917 : 1997 Plastics piping systems Thermoplastics valves Test methods for resistance to internal pressure and leaktightness, published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of testing plastics : Part 11 : Ther
11、moplastics pipes, fittings and valves, as Methods 1134A and B : 1997, for association with related test methods for plastics materials and plastics piping components, as follows. Method 1134A corresponds to method A of EN 917 : 1977, long-term pressure test (see clauses 1 and 3); Method 1134B corres
12、ponds to method B of EN 917 : 1997, leaktightness test (seat and packing test) (see clauses 1 and 4). This European Standard 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
13、 enable experience of the methods 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
14、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. NOTE 1. In the descriptors, the term cocks should be read as valves. The descriptors should have included leak tests, to reflect method B
15、. Warning note. This British Standard, which is identical with EN 917 : 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 ope
16、rated only by trained personnel. Compliance with a 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 6, an inside back cover and a back cover.CEN Eur
17、opean Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 Copyright reserved to CEN members Ref. No. EN 917 : 1997 E EUROPEAN STANDARD EN 917 NORME EUROPE ENNE EUROPA ISCHE NORM January 1997
18、ICS 23.060.00 Descriptors: Plastic tubes, fluid pipelines, thermoplastic resins, cocks, pressure tests, pressure resistance English version Plastics piping systems Thermoplastics valves Test methods for resistance to internal pressure and leaktightness Syste mes de canalisations en plastique Robinet
19、s thermoplastiques Me thodes dessai de la re sistance a la pression interne et de le tanche ite Kunststoff-Rohrleitungssysteme Armaturen aus Thermoplasten Pru fverfahren fu r die Widerstandsfa higkeit gegen Innendruck und die Dichtheit This European Standard was approved by CEN on 1996-09-28. CEN me
20、mbers are bound to comply with the CEN/CENELEC Internal Regulations 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 applica
21、tion to the Central Secretariat or to any CEN member. This European 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
22、 same status as the official versions. CEN members are the national 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 917 : 1997 BSI 1997 Forewor
23、d This European Standard has been prepared by Technical Committee CEN/TC 155, Plastics piping systems and ducting systems, the secretariat of which is held by NNI. This standard is based on the draft international standard ISO/DIS 9393-1 Thermoplastics valves Pressure test methods and requirements P
24、art 1: General prepared by the International Organization for Standardization (ISO). It is a modification of ISO/DIS 9393-1 for reasons of alignment with texts of other standards on test methods. The modifications are: no performance requirements are given; editorial changes have been introduced. Th
25、e material-dependent parameters and/or performance requirements are incorporated in the System Standard(s) concerned. Annex A, which is informative, gives a bibliography. This standard is one of a series of standards on test methods which support System Standards for plastics piping systems and duct
26、ing 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 July 1997, and conflicting national standards shall be withdrawn at the latest by July 1997. According to the CEN/CENELEC Internal Regu
27、lations, 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, Spain, Sweden, Switzerland and the United Kingdom.P
28、age 3 EN 917 : 1997 BSI 1997 1) 1 bar = 0,1 MPa = 10 5 N/m 2 1 Scope This standard specifies test methods for the resistance to internal pressure (method A) and the leaktightness (method B) of thermoplastics valves. This standard is applicable to thermoplastics valves intended for the transport of f
29、luids. 2 Definitions For the purposes of this standard, the following definitions apply. 2.1 nominal pressure (PN) Alphanumerical designation of pressure, used for reference purposes, which is related to the mechanical strength of the valve. It corresponds to the maximum continuous operating pressur
30、e, in bars 1) with water at 20 C, for which the valve is designed. 2.2 test pressure Internal pressure to which a valve is subjected during a test. It is usually expressed in bars. 2.3 closing torque Torque required to close a valve to full tightness at the nominal pressure. It is usually expressed
31、in newton metres. 3 Method A: Long-term pressure test 3.1 Principle A complete valve assembly with its connections is subjected to constant internal pressure at a constant temperature for a period which has to be specified to verify that the design of the valve and its connections do not adversely a
32、ffect the long-term behaviour performance of the valve. NOTE 1. For component pressure testing on a valve body (shell test), ISO/DIS 12092 can be used. The internal pressure is applied using water. The external environment can be air or water. After assembly and conditioning as appropriate, test pie
33、ces are subjected to a specified constant internal pressure for a specified period of time or until the test piece fails. While under pressure the test pieces are kept in an environment at a specified constant temperature. NOTE 2. It is assumed that the following test parameters are set by the stand
34、ard making reference to this standard: a) the test temperature (see 3.2.1); b) the test pressure (see 3.2.2); c) the time under pressure (see 3.2.2); d) any performance requirements including, if applicable, the criteria for a loss of pressure indicative of failure (see 3.2.5); e) the number of test
35、 pieces (see 3.3.2). 3.2 Apparatus 3.2.1 Tank, filled with water kept at a temperature as specified in the referring standard to within 1 C, or a testing room having an air temperature kept within C of the temperature specified in the referring 21 +3 standard. NOTE. As the results are strongly influ
36、enced by temperature, the tolerance on temperature should be kept as small as possible within the specified limits. 3.2.2 Pressurization equipment, capable of: progressively applying the pressure specified in the referring standard; maintaining this pressure with a deviation not exceeding % for the
37、period of time specified in 21 +2 the referring standard. 3.2.3 Pressure measurement devices, capable of checking conformity to the specified test pressure. In the case of calibrated gauges or similar pressure measurement devices, the range of the device shall be such that the required pressure sett
38、ing shall lie within the calibrated range of the device used. The pressure measurement device(s) shall not contaminate the test fluid. NOTE. The use of master gauges for calibration of the apparatus is recommended. 3.2.4 Thermometers or equivalent, capable of checking conformity to the specified tes
39、t temperature. 3.2.5 Timer, capable of recording the duration of the pressure application up to the moment of failure of the test piece, as specified by the referring standard. 3.3 Test pieces 3.3.1 Assembly of test pieces Each test piece shall comprise a complete valve with all connecting elements
40、assembled in accordance with the valve manufacturers instructions and the following requirements, as applicable. a) Valves with flanges or unions. The test piece shall be connected by means of flanges or unions to the test apparatus. b) Valves with threaded ends. The test piece shall be connected by
41、 means of threaded fittings to the test apparatus. c) Valves with ends for fusion or solvent-cement joints. The test piece shall be connected by fusion or solvent cementing to thermoplastics pipe sections. The minimum free length of the pipe sections shall be at least equal to the outside diameter o
42、f the pipe. The pipe shall be cut at right angles to its longitudinal axis.Page 4 EN 917 : 1997 BSI 1997 d) Valves with compression-fitting ends. The test piece shall be connected to appropriate pipe sections. The minimum free length of the pipe sections shall be at least equal to the outside diamet
43、er of the pipe. e) Valves with elastomeric sealing ring type socket joints. The test piece shall be connected to appropriate pipe sections. The minimum free length of the pipe sections shall be at least equal to the outside diameter of the pipe. The curing or setting time for moulded, fused or cemen
44、ted components specified by the manufacturer shall be completed before commencing conditioning in accordance with 3.4. 3.3.2 Number The number of test pieces shall be as specified in the referring standard. 3.4 Conditioning For conditioning before or after 3.5.3, fill the test piece with water and c
45、ondition it for at least 1 h at a temperature not deviating more than 5 C from the specified test temperature (see note 2 to 3.1). 3.5 Procedure 3.5.1 Prepare a test piece in accordance with 3.3. 3.5.2 Before or after 3.5.3 or 3.5.4, as convenient, condition the test piece in accordance with 3.4. 3.
46、5.3 Position the test piece in the tank or testing room in such a way that the test piece is not subject to any additional stress and such that the positioning means shall not provide additional reinforcement to the valve. 3.5.4 Connect the test piece to the pressurizing equipment. 3.5.5 Ensure that
47、 the water in the test piece conforms to the specified test temperature. Expel any trapped air from the test piece. 3.5.6 Progressively and smoothly apply the specified test pressure in not less than 30 s. 3.5.7 While testing in accordance with 3.5.8, observe and record any leakage, damage, pressure
48、 loss or any additional information important for the test results see d) of note 2 to 3.1. 3.5.8 Maintain the pressure and the internal and external temperatures within the limits given in 3.2.2 and 3.2.1 for the specified length of time, or until prior failure. Depressurize the test piece if neces
49、sary. 3.6 Test report The test report shall include the following information: a) the reference to this standard and to the referring standard; b) the type of test carried out, e.g method A; c) all details necessary for the complete identification of the valve, including: 1) the type of valve, its nominal size and the type of end-connections; 2) the material of the body and of its end-connections; 3) the nominal pressure (PN) of the valve; 4) the manufacturers name or trade mark; 5) if appropri
