BS ISO 19893-2012 Plastics piping systems Thermoplastics pipes and fittings for hot and cold water Test method for the resistance of mounted assemblies to temperature cycling《塑料管道系.pdf
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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 19893:2011Plastics piping systems Thermoplastics pipes and fittings for hot and cold water Test method for the resistance of mounted assemblies to temperature cyclingBS IS
2、O 19893:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 19893:2011. The UK participation in its preparation was entrusted to T e c h n i c a l Committee PRI/88/4, Test Methods - Plastic Piping.A list of organizations represented on this committee can be ob
3、tained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012 ISBN 978 0 580 64383 5 ICS 23.040.20; 23.040.45 Compliance with a British Standard can
4、not confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 19893:2011Reference numberISO 19893:2011(E)ISO 2011INTERNATIONAL
5、STANDARD ISO19893First edition2011-12-15Plastics piping systems Thermoplastics pipes and fittings for hot and cold water Test method for the resistance of mounted assemblies to temperature cycling Systmes de canalisations en plastique Tubes thermoplastiques et raccords pour eau chaude et froide Mtho
6、de dessai de la rsistance des assemblages des cycles de temprature BS ISO 19893:2011ISO 19893:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical
7、, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org
8、Published in Switzerland ii ISO 2011 All rights reservedBS ISO 19893:2011ISO 19893:2011(E) ISO 2011 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International
9、 Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, a
10、lso take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical commit
11、tees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the pos
12、sibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 19893 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcomm
13、ittee SC 5, General properties of pipes, fittings and valves of plastic materials and their accessories Test methods and basic specifications. BS ISO 19893:2011BS ISO 19893:2011INTERNATIONAL STANDARD ISO 19893:2011(E) ISO 2011 All rights reserved 1Plastics piping systems Thermoplastics pipes and fit
14、tings for hot and cold water Test method for the resistance of mounted assemblies to temperature cycling 1 Scope This International Standard specifies a method for testing the resistance to temperature cycling of joints for piping systems with rigid or flexible thermoplastics pipes. It is applicable
15、 to thermoplastics piping systems intended to be used in hot and cold water pressure applications. 2 Principle A test assembly of pipes and fittings (see Figure 1) is subjected to temperature cycling by the passage of water under pressure using hot and cold water alternately, for a specified number
16、of cycles. While being subjected to temperature cycling, parts of the assembly of pipes and fittings are maintained under tensile stress and/or flexural strain using static clamps. During and after the test, the assembly is monitored for signs of leakage. NOTE It is assumed that the following test p
17、arameters are set by the reference product standard (i.e. the standard making reference to this International Standard): a) the test temperatures (see 3.1, 3.2 and 6.1); b) the duration of a complete cycle and each part of the cycle (see 3.1, 3.2 and 6.1); c) the test pressure (see 3.6 and 6.1); d)
18、the tensile stress (see 3.8 and 5.3); e) the bending radius (see Clause 4 and Figures 1 and 2); f) the total number of cycles, including the first five cycles (see 6.2 and 6.3). BS ISO 19893:2011ISO 19893:2011(E) 2 ISO 2011 All rights reservedKey 1 hot water reservoir 6 return pipe to reservoir (alt
19、ernative test assembly) 2 alternation equipment A branch A (anchored section) 3 cold water reservoir B branch B (section free to expand and contract) 4 balancing valves C branch C (bent pipe section) 5 tensioning device Figure 1 Test assembly of temperature cycling test 3 Apparatus 3.1 Cold water so
20、urce, capable of all of the following: a) supplying the water volume necessary to maintain the temperature variation throughout the test piece within the specified maximum difference (see 6.2); b) supplying this water at the lowest temperature specified in the reference product standard with an accu
21、racy of 2C; c) supplying this water for the duration of at least each cycle as specified in the reference product standard. If not specified otherwise in the reference product standard, to an accuracy of the duration time of 10minute(s). BS ISO 19893:2011ISO 19893:2011(E) ISO 2011 All rights reserve
22、d 33.2 Hot water source, capable of all of the following: a) supplying the water volume necessary to achieve the required water velocity (see 6.2); b) supplying this water at the highest temperature specified in the reference product standard to an accuracy of 2C; c) supplying this water for the dur
23、ation of at least each cycle as specified in the reference product standard. If not specified otherwise in the reference product standard, to an accuracy of the duration time of 10minute(s). 3.3 Balancing valves, capable of regulating the water velocity as necessary to maintain the temperature varia
24、tion throughout the test piece within the specified maximum difference (see 6.2). 3.4 Alternation equipment, capable of achieving each change in hot and cold water temperatures at the inlet within 1 min. 3.5 Thermometer(s), capable of checking conformity to the specified test temperatures (see 3.1,
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