1、 STD-BSI BS EN 727-ENGL 2777 Lb2Libb7 Ob23795 39T BRITISH STANDARD Plastics piping systems - Thermoplastics valves - Test methods for resistance to internal pressure and leaktightness The European Standard EN 917 : 1997 has the status of a British Standard ICs 23.060.01 NO COPYING WITHOUT BSI PERMIS
2、SION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 917 : 1997 BS 2782 : Part 11 : Methods 1134A and B : 1997 BS EN 917 : 1997 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PW61, Piastics piping systems and components, upon
3、 which the following bodies were represented: British Gas pic British Plastics Federation British Plumbing Fittings Manufxtures? Association British Valve and Actuator Manufacturers? Association Chartered Institution of Water and Environment Management Department of the Environment (British Board of
4、 Agrment) Department of the Environment (Builing Research Establishment) Department of ?kmsport Elecricity Association Heaith and Safety Executive Mtute of Building Control Institute of Materials institution of Civil Engineers Institution of Gas Engineers Natiod Association of Plumbing, Heating and
5、Mechanical Services Contsactors Pipeiine Industries Guild Plastics Land Drainage Manufacturem? Association Society of British Gas Industries Society of British Water Industries Water Companies Association Water Services Association of England and Wales The following bodies were also represented in t
6、he drafting of this standard, through subcommittees and panek ERA Technology Ltd. Engineering Equipment and Materials Users? Association WRA Technology Ltd. This British Standard, having been prepared under the direction of the Sector Board for Materiais and Chemicals, was published under the author
7、ity of the Standards Board and comes into effect on 15 July 1997 O BSI 1997 Amendments issued since publication Amd.No. Date I The following BSI references relate to the work on this standark Committee reference PRY61 Draft for cornent 9V47741 DC ISBN O 580 27385 7 STD-BSI BS EN 917-ENGL 1997 lbZqbb
8、9 Ob23947 Lb2 BS EN 917 : 1997 Contents Committees responsible National foreword page Inside front cover ii Foreword Method 1 Scope 2 Definitions 2 3 3 3 Method A: Long-tem pressure test 3 4 Method B Leaktightness Method 1134B corresponds to method B of EN 917 : 1997, leaktightness test (seat and pa
9、cking 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 enable experience of the methods to be gained and for use for othe
10、r fresh appiications. It is also for use for the revision or amendment of other nationai 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 test method until that standardspecication has been ame
11、nded or revised to make reference to this method and aciiust any requirements as appropriate. NOTE 1. In the descriptors, the term cocks should be read as vaives. The descriptors should have included leak tests, to reflect method B. Warning note. This British Standard, which is identical with EN 917
12、 : 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 Compliance with a British Standard do
13、es 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. u O BSI 1997 * * Kn STD-BSI BS EN 717-ENGL 1777 = 1b24bb7 Ob239V9 T35 EUROPE
14、AN STANDARD NORME EXJR0PEE”E EUROPAscHE NORM EN 917 January 1997 ICs 23.060.00 Descriptors: Plastic tubes, luid pipelines, thermoplastic resins, cocks, pressure tests, pressure resistance English vemion Plastics piping systems - Thermoplastics valves - Tkst methods for resistance to intemal pressure
15、 and 1eakbgh.e Systemes de camhations en plastique- Robines thermoplastiques - Mthodes dessai de la rsistance ia pression interne et de ltanchiti5 Kunststoff-Rohrlei-me - Armaturen aus Thermopiasten- prufverfahren fur die Widerstandsfahigeit gegen Innenchuck und die Dichtheit This European Standard
16、was approved by CEN on 199MB28. CEN members are bound to comply with the CEN/CENELEC intrnal Regdations which stipuak the conditions for giving this European Standard the status of a national standard without any alteration. Uptdate lists and bibiiographical references concerning such national stand
17、ards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). Aversion in any other language made by translation under the responsibility of a CEN member into its own language and notined to th
18、e CenW Secretariat has the 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, Swizerland and United Khgdom. CEN European
19、Committee for Stan-on Comit Europen de Normahation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1060 Brussels O 1997 Copynght reserved to CEN members Ref. No. EN 917 : 1997 E STD-BSI BS EN 717-ENGL 1997 LbZibbS 0b23750 757 Page 2 EN 917 : 1997 Foreword This European Stan
20、dard has been prepared by khnical Committee CENirC 155, Plastics piping systms and ducting systems, the secretariat of which is held by NNI. This standard is based on the draft intemationaJ Fressure test methods and requiremmts - Part 1: Genercd prepared by the International Organization for Standar
21、dization (ISO). It is a mocWcation of ISO/DIS 9393-1 for reasons of alignment with texts of other standards on test methods. The modincations are: standard ISODIS 939S1 Themnqplastics valves - - no performance requirements are given; - editorial changes have been introduced The materialdependent par
22、ametem 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 seria of stan- on test methods which support System Standards for plastics piping systems and ducting systems. This European Stan-
23、 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 the latest by July 1997. According to the CENKENELEC Internal Regulations, the national standards organizations of the foilowing countries are bound to imp
24、lement this European Standard Austria, Belgium, Denmark, Finland, France, Ge-, Greece, Iceland, relan4 I-, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the Unitai Kingdom. conllicting national standards shall be withdrawn at O BSI 1997 STD-BSI BS EN 9Li-ENGL 3997 m Lb24b
25、b9 Ob23953 b3 1 scope This standard specifies test methods for the resistance to internal pressure (method A) and the leddghhess (method B) of thennoplastics valves. This standard is applicable to thermoplastics vaives intended for the transport of fluids. 2 Definitions For the purposes of this stan
26、dard, the following definitions apply 2.1 nominal pressure (PN) Aiphanumeriical designation of pressure, used for reference purposes, which is related to the mechanica strength of the We. It corresponds to the maximum continuous operating pressure, in bars1) with water at 20 OC, for which the valve
27、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 lrque required to close a valve to full tightness at the nominal pressure. It is usuaily expressed in newton metres. 3 Method A Long-term pressure test 3.
28、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 vaive and its connections do not advemely affect the long-term behaviour performance of the We. NOTE
29、 1. For component pressure testing on a valve body (sheil test), ISO/DIS 12092 can be used. The internal pressure is applied using water. The exlmnal environment can be air or water. After assembly and conditioning as appropriate, test pieces are subjected to a specified constant internal pressure f
30、or a specied 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 standard making reference to this standard: a) the test temperature
31、(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 3.2.6); e) the number of test pieces (see 3.3.2). Page 3 EN 917 : 1997 3.2 Apparatus 3.2.1 T
32、ank, flled with water kept at a temperature as specied in the referring standard to within f 1 OC, or a testing room having an air temperahre kept within -1 +3 “C of the temperature specified in the referring standard NOTE. As the results are strongly influenced by temperature, the tolerance on temp
33、erature should be kept as small as possible within the specified limits. 3.2.2 Pressurization equipment, capable of: - progressively applymg the pressure specified in the referring stan-, - maintaining this pressure with a deviation not exceeding zf % for the period of time specified in the referrin
34、g standard. 3.2.3 Fressure masurmt devices, capable of checking conformity to the specified test pressure. In the case of calibrated gauges or simiiar pressure measurement devices, the tange of the device shall be such that the required pressure setting shall lie within the calibrated range of the d
35、evice used. The pressure measurement device(s) shaii not con taminate the test fluid. NOTE. The use of master gauges for calibration of the apparatus is recommended. 3.2.4 Themncwneters or equivalent, capable of checking conformity to the specified test temperature. 3.2.6 Tw, capable of recording th
36、e 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 sha comprise a complete valve with all connecting elements assembled in accordance with the valve manufacturers
37、instnictions and the foliowing 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 threaed ends. The test piece shal be connected by means of threaded fittings to the test apparatus. c) V
38、alves with ends for fusion or solventcement 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 of the pipe. The pipe shall be cut at right angles to its
39、 longitudinal axis. )I bar = 0,l MPa = lo5 N/m2 Q BSI 1997 STD*BSI BS EN 717-ENGL 1777 1b24bb7 Ob23752 52T Page 4 EN 917 : 1997 d) Vaives with compression-fi- 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
40、 the outside diameter of the pipe. e) Vahres 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 moul
41、ded, fused or cemented components specified by the mufacturer shall be completed before commencing conditioning in accordance with 3.4. 3.3.2 Number The number of test pieces shaU be as specified in the referring standard. 3.4 Conditioning For conditioning before or after 3.6.3, fill the test piece
42、with water and condition it for at least 1 h at a temperature not deviating more than f 5 “C from the specified test temperature (see note 2 to 3.1). 3.6 Procedure 3.6.1 Prepare a test piece in accordance with 3.3. 3.6.2 Before or after 3.6.3 or 3.6.4, as convenient, condition the test piece in acco
43、rdance with 3.4. 3.6.3 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. 3.6.4 Connect the test piece to the pressurizing equipment
44、. 3.6.6 Ensure that the water in the test piece conforms to the specified test temperature. Expel any -ped air from the test piece. 3.6.6 Progressively and smoothly apply the specified test pressure in not less than 30s. 3.6.7 While testing in accordance with 3.6.8, observe and record any leakage, d
45、amage, pressure loss or any additiona3 information important for the test results see d) of note 2 to 3.11. 3.6.8 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 fdure. Depressurize the test
46、piece if necessary. 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) ali details necessary for the complete identification of the valve, including: 1) the type o
47、f valve, its nominai size and the type of end-connectionq 2) the material of the body and of its end; O BSI 1997 4.2 Apparatus 4.2.1 Tank, filled with water, or a testing room kept at a temperature as specified in the referring standard NOTE. in general the specified test temperature is equal to the
48、 room temperature which should not deviate more than -8 C. 4.2.2 Pressurization equiptent, capable of - progresively applying the pressure specified in the referring standard, using the fluid specified in the referring standard When this is air, nitrogen may be used instead (see 4.1); - maintainhg t
49、his pressure with a deviation not exceeding the referring standard. % for the length of time specified in 4.2.3 Pressure measurement devices, capable of checking conformity to the specified test pressure (see 4.2.2). In the case of gauges or similar calibrated pressure measurement devices, the range of the device shali be such that the required pressure setting shali lie within the calibrated range of the device used. The pressure measwement deviceCs) sha not con taminate the test fluid NOTE. The use of master gauges for calibration of
