资源描述：
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1705 1997 BS 2782 Part 11 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 Testfortheintegrityof avalveafteranexternalblow BS EN 1705 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 reference PRI/61 Draft for comment 95/121250 DC ISBN 0 580 27180 3 Amendments issued since publication Amd. No.DateText affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/61, Plastics 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 Department of the Environment British Board of Agre ment Department of the Environment Building Research Establishment Department of Transport Electricity Association Health and Safety cutive Institutute of Building Control Institute of Materials Institution of Civil Engineers Institution of Gas Engineers National Association 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 were also represented in the drafting of the standard, through subcommittees and panels ERATechnology Ltd. Engineering Equipment and Materials Users Association RAPRATechnology Ltd. 标准分享网 w w w .b z f x w .c o m 免费下载 BS EN 1705 1997 BSI 1997i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1Scope3 2Normative references3 3Principle3 4Apparatus3 5Test piece3 6Procedure4 7Test report4 ii 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 piping systems Thermoplastics valves Test for the integrity of a valve after an external blow, published by the European Committee for Standardization CEN. It is incorporated into BS 2782 s of testing plastics Part 11 Thermoplastics pipes, fittings and valves, as 1133C 1997, for association with related test s for plastics materials and plastics piping components. This test 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 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 test until that standard/specification has been amended or revised to make reference to this and adjust any requirements as appropriate. Cross-references Publication referred toCorresponding British Standard EN 744 1995BS EN 744 1996 Plastics piping and ducting systems Thermoplastics pipes Test for resistance to external blows by the round-the-clock BS 2782 Part 11 1108C 1996 EN 28233BS EN 28233 1992 Thermoplastics valves Torque Test BS 2782 Part 11 1131 1992 NOTE 1. In the descriptors, the term driving squares is irrelevant 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 British 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 should be operated only by trained personnel. In particular, it is the opinion of UK Technical Committee PRI/61 that the 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 conditions may be inappropriate, e.g. conditioning to 220 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 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. 标准分享网 w w w .b z f x w .c o m 免费下载 CEN European Committee for Standardization Comite Europe en 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 STANDARDEN 1705 NORME EUROPE ENNE EUROPA ISCHE NORM November 1996 ICS 23.060.00 Descriptors Plastic tubes, cocks, thermoplastic resins, driving squares, tests, impact tests, verification, torque English version Plastics piping systems Thermoplastics valves Test for the integrity of a valve after an external blow Syste mes de canalisations en plastique Robinets thermoplastiques Me thode dessai pour la ve 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 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 application 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 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 1705 1996 BSI 1997 Foreword 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. The material-dependent parameters and/or perance requirements are incorporated in the System Standards concerned. This standard is one of a series of standards on test s which support 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 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, Spain, Sweden, Switzerland and the United Kingdom. 标准分享网 w w w .b z f x w .c o m 免费下载 Page 3 EN 1705 1996 BSI 1997 1 Scope This standard specifies a 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 references 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 publications 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 1995Plastics piping and ducting systems - Thermoplastics pipes - Test for resistance to external blows by the round-the clock EN 28233Thermoplastics valves - Torque - Test 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 likely to impair its perance 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 are 220C and 40C. NOTE. It is assumed that the following test 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, the test temperatures 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, coning to EN 744, with the testing parameters as specified by the referring standard. 4.3 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 2202 C. 4.5 A temperature-controlled environment, maintained at 402 C. 4.6 A temperature-controlled water bath, maintained at 202 C. 4.7 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 conity to the specified pressure see 6.6; c a temperature measurement devices capable of checking conity to the temperatures 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, complete 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 so that when tested in accordance with 6.1.4 the striker will impact upon the position on the valve mechanism most likely to impair its perance. 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 clause 3. 6.1.3 Place the valve and fixture assembly in the temperature-controlled environment and condition it at 2202 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 release 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 contain the possible effects of failure of components subjected to impact testing or destructive testing. 6.2 Assessment of operating torque at 220 C Following the impact test recondition the valve at 2202 C for a minimum of 2 h. Measure and record the opening and closing torques in accordance with EN 28233. 6.3 Assessment of the resistance of the stop mechanism at 220 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 Assessment of operating torque at 40 C Following testing in accordance with 6.2 and 6.3, recondition the valve at 402 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 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, connect the valve to the pneumatic pressure source [see item a of 4.7] and condition it in a water bath at 202 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 recording, 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 ination a the reference to this standard and to the 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 both 220 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 mec
展开阅读全文
