1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 19899:2010Plastics piping systems Polyolefin pipes andmechanical fitting assemblies Test method for theresistance to end load (ARELtest)BS ISO 19899:2010 BRITISH STANDARDN
2、ational forewordThis British Standard is the UK implementation of ISO 19899:2010.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/88/4, Test Methods - Plastic Piping.A list of organizations represented on this committee can beobtained on request to its secretary.This p
3、ublication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 60522 2ICS 23.040.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the
4、 authority of theStandards Policy and Strategy Committee on 30 November 2010.Amendments issued since publicationDate Text affectedBS ISO 19899:2010Reference numberISO 19899:2010(E)ISO 2010INTERNATIONAL STANDARD ISO19899First edition2010-09-15Plastics piping systems Polyolefin pipes and mechanical fi
5、tting assemblies Test method for the resistance to end load (AREL test) Systmes de canalisations en matires plastiques Assemblages de tubes en polyolfines et raccords mcaniques Mthode dessai de rsistance en fin de charge (essai AREL) BS ISO 19899:2010ISO 19899:2010(E) PDF disclaimer This PDF file ma
6、y contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the resp
7、onsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creati
8、on parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2010
9、 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, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the count
10、ry 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 Published in Switzerland ii ISO 2010 All rights reservedBS ISO 19899:2010ISO 19899:2010(E) ISO 2010 All rights reserved iiiContents Page Fo
11、reword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Principle .2 5 Apparatus.2 5.1 Tensile loading equipment .2 5.2 External environment2 5.3 Leak test apparatus.3 6 Test piece .3 7 Procedure.4 8 Test report4 Annex A (normative) End load forces for PE 80 pipes and
12、PE 100 pipes5 Bibliography7 BS ISO 19899:2010ISO 19899:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carrie
13、d 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, also take part in the work. IS
14、O 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 committees is to prepare Internatio
15、nal 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 possibility that some of the ele
16、ments 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 19899 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 5, General propertie
17、s of pipes, fittings and valves of plastic materials and their accessories Test methods and basic specifications. BS ISO 19899:2010ISO 19899:2010(E) ISO 2010 All rights reserved vIntroduction The Accelerated Relaxation and End Load test (AREL) was introduced initially in the gas industry product sta
18、ndard for full end-load-bearing mechanical fittings designed for connection to PE gas pipes. Its introduction as a stand-alone test method covering polyolefin pipes provides the opportunity for the method to be used in other application areas. BS ISO 19899:2010BS ISO 19899:2010INTERNATIONAL STANDARD
19、 ISO 19899:2010(E) ISO 2010 All rights reserved 1Plastics piping systems Polyolefin pipes and mechanical fitting assemblies Test method for the resistance to end load (AREL test) 1 Scope This International Standard specifies a method to determine, for mechanically jointed polyolefin pipe and fitting
20、 assemblies in sizes of dnu 63 mm, the effect of component relaxation and creep on the resistance of the assembly to pipe pull out under the long-term application of a constant and longitudinally applied force. The susceptibility of the polyolefin pipe to stress crack failure initiated by the joint
21、assembly is also examined. NOTE For sizes dn 63 mm, the method is under development. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of t
22、he referenced document (including any amendments) applies. ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 1: General method ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance o
23、f fluids Determination of the resistance to internal pressure Part 4: Preparation of assemblies ISO 3458, Assembled joints between fittings and polyethylene (PE) pressure pipes Test of leakproofness under internal pressure 3 Terms and definitions For the purposes of this document, the following term
24、s and definitions apply. 3.1 lower confidence limit of the predicted hydrostatic strength LPLquantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the predicted hydrostatic strength at a temperature and time t NOTE 1 The quantity is expressed in megapascals.
25、NOTE 2 Temperature, , is expressed in degrees Celsius and time, t, is expressed in years. BS ISO 19899:2010ISO 19899:2010(E) 2 ISO 2010 All rights reserved3.2 minimum required strength MRS value of LPLat 20 C and 50 years, rounded down to the next smaller value of the R10 series or the R20 series NO
26、TE The R10 series conforms to ISO 31, the R20 series conforms to ISO 4972. 3.3 standard dimension ratio SDR ratio of the nominal outside diameter, dn, of a pipe to its nominal wall thickness, en4 Principle A test piece assembly of a polyolefin pipe(s) and a mechanical fitting, suspended in a bath of
27、 water or in air at 80 C is subjected to a constant tensile force, F, applied along the longitudinal axis of the pipe for a defined period of time. The force, F, is then removed and the assembly conditioned to 23 C before testing for leakage. NOTE 1 The magnitude of the applied force is intended to
28、simulate the combined effect of internal pressure, thermal contraction and secondary bending effects arising from loss of soil support around the pipe close to the fitting. For sizes dnW 355 mm, experience has suggested loss of localized soil support is less likely to result in significant longitudi
29、nal bending stresses and consequently the applied force has been determined taking into account internal pressure and thermal contraction only. NOTE 2 The elevated test temperature for fittings containing non-metallic non-polyolefin components can be less than 80 C in order to avoid transitions in m
30、aterial properties that are non-representative of the in-service application and possible degradation effects. Any reduction in test temperature should be undertaken in conjunction with an extension in the test period to take account of the time dependent properties of the component parts of the joi
31、nt. 5 Apparatus 5.1 Tensile loading equipment, capable of applying a constant tensile force along the longitudinal axis of the pipe(s) connected to the mechanical fitting being tested. The force on the pipe shall be accurate to within 1 % of the indicated force. The tensile force may be applied dire
32、ctly or via a lever arm, using dead weights or a fluid-activated loading cylinder. The test framework, as diagrammatically illustrated in Figure 1, shall be designed to permit the transmission of the applied force from the pipe to the joint and fitting assembly without reduction by frictional losses
33、 generated by the supporting structure. 5.2 External environment 5.2.1 Water, contained in a tank, and kept at a constant temperature, as specified by the referring standard, normally 80 C, with a permissible variation of 1 C from the specified temperature. The water shall not contain impurities whi
34、ch could affect the results. 5.2.2 Air, in an enclosure, kept at a constant temperature, as specified by the referring standard, normally 80 C, with a permissible variation of 21C+from the specified temperature. 5.2.3 Circulation, forced. As the results are strongly influenced by temperature, the va
35、riation in temperature shall be kept as small as possible within the limits specified in 5.2.1 and 5.2.2, e.g. by using forced circulation of the test fluid. When testing with air, it is recommended that the surface temperature be checked in addition to the air temperature. BS ISO 19899:2010ISO 1989
36、9:2010(E) ISO 2010 All rights reserved 3Key F applied longitudinal end load force 1 end load bearing type A end cap 2 fitting to be tested 3 test fluid water or air 4 end load bearing type A end cap aEnd load reaction forces generated within the loading framework. Figure 1 Schematic illustration of
37、tensile loading equipment 5.3 Leak test apparatus, to enable the conduct of leakage tests on fitting to pipe assemblies in accordance with ISO 3458, using air, inert gas or water as the pressurizing medium at an ambient temperature of (23 2) C and pressures of 25 mbar1)and 1,5 times nominal pressure
38、 (see Clause 7). NOTE Nominal pressure for gas applications is MOP and for water, PN. 6 Test piece The test piece shall comprise a polyolefin pipe or pipes connected to a mechanical fitting conforming to ISO 1167-4. Type A end caps, as specified in ISO 1167-1, shall be attached to the pipe(s). The f
39、ree length of pipe between the fitting and the terminating end caps shall be at least 100 mm or twice the nominal pipe diameter, dn, in millimetres, whichever is the greater value, with a maximum of 250 mm. The end caps shall be capable of withstanding the applied tensile force and maintaining press
40、ure during the leak test. 1) 1 mbar = 100 Pa. BS ISO 19899:2010ISO 19899:2010(E) 4 ISO 2010 All rights reserved7 Procedure Assemble the fitting and end caps to the test pipe(s) in accordance with the manufacturers assembly instructions. Mount the assembled test piece in the loading frame taking care
41、 to avoid distortion or frame-induced loading of any of the fitting components. Place the test piece assembly in the external environment operating under the conditions specified in 5.2 and condition the test piece at the test temperature in accordance with the requirements for conditioning given in
42、 ISO 1167-1. In cases of dispute, the external environment shall be water. After the test piece has been held for the required conditioning time at the test temperature, apply the end load force within 2 % of the values specified in Annex A for dnu 250 mm and 5 % for dn 250 mm. Apply the force gradu
43、ally within a time period of (5 1) min and avoid shock loading of the test piece. Maintain the applied force for a minimum of 500 h. In cases where the referring standard specifies performance requirements at temperatures other than 80 C, the tolerances on temperature, applied load and test duration
44、 contained in this International Standard shall apply. Unload the test piece and immediately implement the following consecutive procedure, avoiding delays between each procedural element: a) condition the test piece for 24 h at (23 2) C; b) conduct a leaktightness test in accordance with ISO 3458 a
45、t a test pressure of 25 mbar; c) conduct a second leaktightness test at 1,5 times nominal pressure (see 5.3). Air or inert gas shall be used as the test medium for fittings intended for gas applications up to a leak test pressure of 8 bar subject to national safety regulations. The test medium for p
46、ressures greater than 8 bar shall be water. At the end of each stage of the leaktightness test before depressurising, inspect the test piece and record the position of any leakage. Test times less than 500 h are permitted in conjunction with appropriate changes to the applied load, provided correlat
47、ion with the 500 h performance is demonstrated. 8 Test report The test report shall include the following information: a) a reference to this International Standard, i.e. ISO 19899:2010; b) a complete identification of the fitting and pipe tested including 1) the test temperature, and 2) the end loa
48、d test force; c) the duration of the test and, if applicable, a description of the failure mode; d) details of position and mode of any leakage and the associated test pressure; e) any factors that could have affected the results, such as deviations from temperature limits, any incidents or any oper
49、ating details not specified in this International Standard; f) the date of the test. BS ISO 19899:2010ISO 19899:2010(E) ISO 2010 All rights reserved 5Annex A (normative) End load forces for PE 80 pipes and PE 100 pipes End load forces for PE 80 pipes and PE 100 pipes shall conform to Table A.1 or Table A.2, as applicable. NOTE For sizes dnu 315 mm, the applied force is selected to simulate the combined effect of internal pressure, thermal contraction and secondary bending loads.
