1、BSI Standards PublicationBS ISO 10952:2014Plastics piping systems Glass-reinforced thermosettingplastics (GRP) pipes and fittings Determination of theresistance to chemical attackfor the inside of a section in adeflected conditionBS ISO 10952:2014 BRITISH STANDARDNational forewordThis British Standa
2、rd is the UK implementation of ISO 10952:2014. Itsupersedes BS ISO 10952:2008 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/88/2, Plastics piping for pressure applications.A list of organizations represented on this committee can beobtained on req
3、uest to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 83226 0ICS 23.040.20; 23.040.45Compliance with
4、a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2014.Amendments issued since publicationDate Text affectedBS ISO 10952:2014 ISO 2014Plastics piping systems Glass-reinforc
5、ed thermosetting plastics (GRP) pipes and fittings Determination of the resistance to chemical attack for the inside of a section in a deflected conditionSystmes de canalisations en matires plastiques Tubes et raccords en plastiques thermodurcissables renforcs de verre (PRV) Dtermination de la rsist
6、ance une attaque chimique lintrieur dun tronon de tube soumis dflexionINTERNATIONAL STANDARDISO10952Third edition2014-03-15Reference numberISO 10952:2014(E)BS ISO 10952:2014ISO 10952:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise spec
7、ified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or I
8、SOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 10952:2014ISO 10952:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 S
9、cope . 12 Normative references 13 Terms and definitions . 14 Principle 25 Test liquid 26 Apparatus . 27 Test pieces . 37.1 Preparation 37.2 Number 48 Determination of the dimensions of the test piece . 48.1 Length . 48.2 Mean wall thickness . 48.3 Mean diameter 49 Conditioning 410 Test procedure usi
10、ng deflection measurement 411 Test procedure using strain measurement . 612 Calculation of extrapolated value . 713 Test report . 7BS ISO 10952:2014ISO 10952:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bod
11、ies). The work of preparing International 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
12、 non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are des
13、cribed in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn
14、 to the possibility 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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on th
15、e ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment
16、, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommi
17、ttee SC 6, Reinforced plastics pipes and fittings for all applications.This third edition cancels and replaces the second edition (ISO 10952:2008), of which it constitutes a minor revision.iv ISO 2014 All rights reservedBS ISO 10952:2014INTERNATIONAL STANDARD ISO 10952:2014(E)Plastics piping systems
18、 Glass-reinforced thermosetting plastics (GRP) pipes and fittings Determination of the resistance to chemical attack for the inside of a section in a deflected condition1 ScopeThis International Standard specifies a method for determining the chemical resistance properties of glass-reinforced thermo
19、setting plastics (GRP) pipes and fittings in a deflected condition for nominal sizes DN 100 and larger.In conjunction with ISO 10928, this International Standard provides a method for evaluating the effect of a chemical environment on the interior of a pipe or fitting after a specified period of tim
20、e. Test conditions and requirements are specified in the referring International Standard. ISO 10467 references this International Standard.NOTE It has been found that the effect of chemical environments can be accelerated by strain induced from deflection; hence, it is frequently referred to as str
21、ain corrosion.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (includ
22、ing any amendments) applies.ISO 10467, Plastics piping systems for pressure and non-pressure drainage and sewerage Glass-reinforced thermosetting plastics (GRP) systems based on unsaturated polyester (UP) resinISO 10928, Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes and
23、 fittings Methods for regression analysis and their use3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1mean diameterdmdiameter of the circle corresponding with the middle of the pipe wall cross sectionNote 1 to entry: The mean diameter is given
24、by either of the following formulae:dm= di+ emdm= de emwhere ISO 2014 All rights reserved 1BS ISO 10952:2014ISO 10952:2014(E)deis the external diameter of the pipe;diis the internal diameter of the pipe;emis the mean wall thickness of the pipe at the bottom.Note 2 to entry: The mean diameter and the
25、 dimensions used to calculate it are expressed in millimetres.3.2leak failurefailure which becomes apparent by the passage of the test liquid through the pipe wallNote 1 to entry: Failures of the test sample have been observed at the spring-line location without leakage of the test liquid. While lea
26、kage is not observed, this can be considered a failure of the test sample as the strain levels in the sample will be altered invalidating any continuation of the test. The test can be discarded or optionally counted as a failure occurring at the time of spring-line breakage.4 PrincipleThe interior o
27、f a test piece is exposed to a corrosive test liquid at a specified temperature while being maintained in a fixed diametrically deflected condition. The test is repeated at several deflection levels, using a fresh test piece each time and recording the time to leak failure at each deflection. The re
28、sults are used to calculate an extrapolated deflection value for a specified period of time.Alternatively, the extrapolation can be performed using calculated or measured strains. Strain can be measured using strain gauges.NOTE Use of strain allows testing using test pieces of variable thickness and
29、 stiffness classes. Deflection and strain are interrelatable by calculation.It is assumed that the following test parameters are set by the International Standard making reference to this International Standard:a) the composition of the test liquid (see Clause 5);b) the number and length of test pie
30、ces (see Clause 7);c) the preconditioning to be applied (see Clause 9);d) the test temperature (see 10.1 or 11.1);e) if failures do not occur (see 10.11 and 11.11), the specified deflection levels and related minimum time intervals;f) the time to which the data have to be extrapolated (see Clause 12
31、).5 Test liquidThe test liquid shall be as specified in the referring International Standard. The quantity shall be sufficient to achieve and maintain for the duration of the test the specified depth within the test piece (see 10.7 or 11.7).6 Apparatus6.1 Loading frame, comprising two parallel steel
32、 sections and threaded rods which can maintain a constant deflection of the test piece (see Figure 1 for typical test set-up). The sections shall be sufficiently stiff such that visible bending or deformation of the sections does not occur during the compression of the test piece. Each section shall
33、 have a length equal to the length of the test piece plus at least 30 mm and a width of at least 100 mm.2 ISO 2014 All rights reservedBS ISO 10952:2014ISO 10952:2014(E)6.2 Dimensional measuring devices, capable of determining:a) the dimensions (length, diameter, and wall thickness) to an accuracy of
34、 within 0,5 %;b) the change in diameter of the test piece in the vertical direction to an accuracy of within 1,0 % of the maximum value of the change;c) if used, strain gauges of the foil type, single element suitable for the maximum anticipated strain level, and a length appropriate for the pipe di
35、ameter.Strain gauges of length 6 mm and 12 mm have been found to be effective for pipe diameters 300 mm to 600 mm. Consult the strain gauge manufacturer for gauge length recommendations for other pipe diameters.Key1 steel channel section2 dam3 sealant4 threaded rod5 test liquid6 test piece7 strain g
36、auge (optional)Ddmdeflected diameterFigure 1 Typical test set-up7 Test pieces7.1 PreparationThe test piece shall comprise a complete ring cut from the pipe or fitting to be tested. The length of the test piece shall be as specified in the referring International Standard, with permitted deviations o
37、f 5 %.The cut ends shall be smooth and perpendicular to the axis of the test piece. ISO 2014 All rights reserved 3BS ISO 10952:2014ISO 10952:2014(E)Two straight lines, diametrically opposed, shall be drawn longitudinally on the inside of the test piece.7.2 NumberThe number of test pieces shall be as
38、 specified in the referring International Standard, provided that for regression analysis, the number of test pieces is such that a minimum of 18 data points in accordance with 10.2 or 11.2 can be obtained.8 Determination of the dimensions of the test piece8.1 LengthMeasure the length of the test pi
39、ece along each line with sufficient accuracy to determine whether or not each test piece conforms with the requirements of Clause 7. Trim or replace, as applicable, each test piece that does not conform.8.2 Mean wall thicknessMeasure (6.2), to an accuracy of within 1,0 %, the wall thickness of the t
40、est piece at six equally spaced locations along one of the longitudinal lines specified in 7.1. (This line then becomes the bottom of the test piece.) Calculate the mean wall thickness, em, as the arithmetic average of the six measured values.8.3 Mean diameterMeasure (6.2), to an accuracy of within
41、1,0 %, either the internal diameter, di, of the test piece at mid-length, by means of e.g. a calliper, or the external diameter, de, of the test piece, by means of e.g. a circumferential wrap steel tape.Determine the mean diameter, dm(see 3.1), of the test piece by calculation using the values obtai
42、ned for mean wall thickness, em, and either the internal or the external diameter.9 ConditioningUnless otherwise specified by the referring International Standard, the test pieces shall be stored under testing conditions for at least 8 h.10 Test procedure using deflection measurementWARNING Contain
43、any fragmentation or leakage that can occur during the test.10.1 During the following procedure, maintain the temperature specified in the referring International Standard.10.2 Select the range of estimated deflections such that the times to failure of at least 18 test pieces are distributed between
44、 0,1 h and over 10 000 h, and the distribution of failure times of at least 10 values conforms to the limits given in Table 1.NOTE Deflections in excess of 28 % of diameter can cause local flattening of the pipe and lead to erratic strain distribution. For deflections approaching 28 %, improved accu
45、racy is obtained by use of additional strain gauges or by establishing, for a typical test piece, a calibration of deflection versus measured strain. This calibration technique is also useful at all deflection levels as a check of the calculations which assume that the neutral axis is at the midpoin
46、t of the test piece wall.4 ISO 2014 All rights reservedBS ISO 10952:2014ISO 10952:2014(E)Table 1 Failure time distributionFailure time tfhMinimum number of failures10 tf 1 000 41 000 6 000 3aaAt least one of these shall exceed 10 000 h.10.3 Place the test piece in the apparatus such that the lines o
47、n the test piece are vertically aligned, parallel to, and centred on the axes of the plates or sections.By visual inspection, ensure that the contact between the test piece and loading apparatus is as uniform as possible and that the plates or sections are not tilted.10.4 Apply force to the apparatu
48、s to deflect the test piece while keeping the top and bottom plates or sections of the apparatus as parallel as possible.When the applicable deflection is reached (see 10.2), note the time and lock the apparatus to maintain the test piece in the deflected condition.10.5 Using a flexible sealant, ins
49、tall chemically inert dams so that only the inside surface of the test piece is exposed to the test environment. The dams shall not add support to the test piece.10.6 Calculate the initial linear strain level, 0, expressed as a percentage, using Formula (1), which includes compensation for increased horizontal diameter with increasing deflection:02428 1002=+, eydymm(1)whereemis the mean wall thickness, in millimetres, of the test piece at bottom (see 8.2);y is the average vertical deflection, in m
