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1、BRITISH STANDARD BS 2782-11: Method 1127P: 1997 ISO 1167:1996 Methods of testing Plastics Part 11: Thermoplastics pipes, fittings and valves Method 1127P: Thermoplastics pipes for the conveyance of fluids Resistance to internal pressure Test method ICS 23.040.20 Licensed Copy: London South Bank Univ
2、ersity, London South Bank University, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1127P: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
3、and comes into effect on 15 August 1997 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference PRI/61 Draft for comment 83/55572 DC ISBN 0 580 27955 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to
4、 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 a
5、nd Environment Management Department of the Environment (British Board of Agrment) Department of the Environment (Building Research Establishment) Department of Transport Electricity Association Health and Safety Executive Institute of Building Control Institute of Materials Institution of Civil Eng
6、ineers Institution of Gas Engineers National Association of Plumbing, Heating and Mechanical Services Contractors Pipeline Industries Guild Plastics Land Drainage Manufacturers Association Society of British Gas Industries Society of British Water Industries Water Companies Association Water Service
7、s Association of England and Wales The following bodies were also represented in the drafting of this standard, through subcommittees and panels: ERA Technology Ltd. Engineering Equipment and Materials Users Association RAPRA Technology Ltd. Amendments issued since publication Amd. No.DateComments L
8、icensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1127P:1997 BSI 09-1999i Contents Page Committees responsibleInside front cover National forewordii Forewordiii Text of ISO 11671 Licensed Copy: L
9、ondon South Bank University, London South Bank University, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1127P:1997 ii BSI 09-1999 National foreword This British Standard reproduces verbatim ISO 1167:1996, including Technical Corrigendum 1:1997, and implements it a
10、s a UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/61, Plastics piping systems and components, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on t
11、he interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references This International St
12、andard is incorporated into BS 2782 Methods of testing plastics Part 11: Thermoplastics pipes, fittings and valves, as Method 1127P, for association with related test methods for plastics materials and plastics piping components. In this context, attention is drawn to BS EN 921:1995, dual-numbered a
13、s BS 2782-11:Method 1127A:1995 which was prepared to anticipate the publication of European Standards for specification of plastics piping systems. It is currently proposed that ISO 1167 will be adopted to provide a revision of or replace EN 921. Meanwhile the contents of ISO 1167:1996 and EN 921:19
14、94 are not identical and each should therefore be used exactly as specified. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”
15、, or using the “Find” facility of the BSI Standards Electronic Catalogue. WARNING NOTE. This British Standard, which is identical with ISO 1167:1996, 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
16、 paid to any appropriate safety precautions and the method should be operated only by trained personnel. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Stan
17、dard 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 ISO title page, pages ii to iv, pages 1 to 7 and a back cover. This standard has been updated (see copyright date) and may have had amend
18、ments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: London South Bank University, London South Bank Univer
19、sity, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1127P:1997 ii BSI 09-1999 Contents Page Forewordiii 1Scope1 2Normative references1 3Definitions1 4Principle1 5Test parameters1 6Apparatus1 7Test pieces3 8Calibration of the apparatus and calculation of the test pr
20、essure3 9Conditioning4 10Procedure4 11Test report5 Annex A (informative) Basic specifications6 Figure 1 Examples of devices for the internal pressure testing of pipes2 Table 1 Conditioning periods4 Table A.1 Unplasticized poly(vinyl chloride) (PCV-U)6 Table A.2 Chlorinated poly(vinyl chloride) (PVC-
21、C)6 Table A.3 Polyethylene (PE)6 Table A.4 Polypropylene (PP)6 Table A.5 Polybutene (PB)7 Table A.6 Cross-linked polyethylene (PE-X)7 Descriptors: Fluid pipelines, pipes (tubes), thermoplastic resins, plastic tubes, tests, pressure tests, determination, pressure resistance, internal pressure. Licens
22、ed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1127P:1997 BSI 09-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS
23、O member bodies). 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, gove
24、rnmental and 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. Draft International Standards adopted by the technical committees are circulated to th
25、e member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 1167 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee S
26、C 5, General properties of pipes, fittings and valves of plastic materials and their accessories Test methods and basic specifications. This second edition cancels and replaces the first edition (ISO 1167:1973), of which it constitutes a technical revision. Annex A of this International Standard is
27、for information only. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled Copy, (
28、c) BSI BS 2782-11:Method 1127P:1997 BSI 09-19991 1 Scope This International Standard specifies a method for determination of the resistance of thermoplastics pipes to constant internal water pressure at constant temperature. It is applicable to thermoplastics pipes intended for the conveyance of flu
29、ids. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on
30、 this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 161-1:1996, Thermoplastics pipes for the conveyance of fluids No
31、minal outside diameters and nominal pressures Part 1: Metric series. ISO 3126:1974, Plastics pipes Measurement of dimensions. ISO/TR 9080:1992, Thermoplastics pipes for the transport of fluids Methods of extrapolation of hydrostatic stress rupture data to determine the long-term hydrostatic strength
32、 of thermoplastics pipe materials. 3 Definitions For the purposes of this International Standard, the definitions given in ISO 161-1 apply. 4 Principle After conditioning, test pieces are subjected to a specified constant internal hydrostatic pressure for a specified period of time or until failure.
33、 Throughout the test, the test pieces are kept in an environment at a specified constant temperature: this is water (“water-in-water” test), another liquid (“water-in-liquid” test) or air (“water-in-air” test). 5 Test parameters The following test parameters are set by the standard making reference
34、to this International Standard: a) the type of end cap to be used (see 6.1); b) the size and S-series of pipe to be used (see 7.1); c) the test temperature (see 6.2 and 10.1); d) for pipes of nominal outside diameter dn greater than 315 mm, the free length of the test piece, if other than 1 000 mm (
35、see 7.1.1); e) the number of test pieces (see 7.2); f) the test pressure p or the hoop stress B to be induced by the test pressure (see 8.2.2); g) the conditioning period (see clause 9), if other than as specified in Table 1; h) the type of test, i.e. water-in-water/air/liquid (see clause 4 and 10.1
36、); i) the duration of the test under pressure and the criteria for a failure (see 10.3); j) the requirements, or patterns of requirements, if any, which determine the initiation of additional testing. 6 Apparatus 6.1 End caps, fixed to the ends of the pipe. By means of an appropriate system, they sh
37、all allow sealing and connection to the pressurizing equipment. The end cap shall be of one of the following types: a) Type A: Fittings rigidly connected to the test piece but not to each other, and hence transmitting the hydrostatic end thrust to the test piece, e.g. as shown in Figure 1 a). They m
38、ay comprise flanged plates on the ends of a large-diameter pipe, optionally welded when flanges, caps, plugs or plates are of a material compatible with that of the test pieces. b) Type B: Sockets, made of metal, fitted with joints ensuring sealing onto the external surface of the test piece and con
39、nected to one another, and hence not transmitting the hydrostatic end thrust to the test piece. They may comprise one or more metal rods, as shown in Figure 1 b), allowing sufficient longitudinal movement at the ends of the test piece to avoid buckling due to thermal expansion. Other than toothed gr
40、ips, any sharp edges which would come into contact with the outside surface of the pipe shall be rounded off. The constituent material of the end cap shall not have any known adverse effect on the pipe under test. NOTE 1In general, times to failure with type B end caps are shorter than those obtaine
41、d with type A end caps because of differences of stress in deformation. NOTE 2When no precautions are taken, type B end caps can cause buckling of the test piece when the test piece is assembled with the end caps at a lower temperature than the test temperature. For the evaluation of pipe and/or fit
42、ting materials in accordance with ISO/TR 9080, type A end caps shall be used unless otherwise specified in the referring standard. The reference end cap is the type A end cap. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled
43、Copy, (c) BSI BS 2782-11:Method 1127P:1997 2 BSI 09-1999 Figure 1 Examples of devices for the internal pressure testing of pipes Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:31:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1127P:1997 BSI
44、09-19993 6.2 Tank, filled with water or another liquid, kept at a constant temperature, as specified in the referring standard, to within a mean of 1 C and a maximum deviation of 2 C (see 10.2), or oven, the temperature of which shall be kept at the specified value to within a mean ofC and maximum d
45、eviations ofC. When an environment other than water is used, all necessary precautions shall be taken, in particular those concerning safety and any interaction between liquids and the material(s) of the test piece. When environments other than water are used, tests which are intended to be comparat
46、ive shall be carried out in the same environment. As the results are strongly influenced by temperature, the tolerance on temperature shall be kept as small as possible within the specified limits, e.g. by using forced circulation of the fluid. When testing in air, it is recommended that the pipe su
47、rface temperature is checked in addition to the air temperature. The water shall not contain any impurities which could affect the results. 6.3 Supports or hangers, enabling test pieces to be placed in the tank or oven (6.2) in such a way that there is no contact between them or with the side walls
48、of the tank or oven. 6.4 Pressurizing equipment, capable of applying the required pressure gradually and smoothly in accordance with 10.1 and then of keeping it constant to within% for the duration of the test. As the results are strongly influenced by pressure, the tolerance on pressure shall be ke
49、pt as small as possible within the specified limits. NOTE 1The pressure should preferably be applied individually to each test piece. However, the use of equipment enabling the pressure to be applied simultaneously to several test pieces is also permitted if there is no danger of interference when failure occurs (e.g. by the use of an isolation valve or a test based on the first failure in a batch). NOTE 2To maintain the pressure within the specified tolerance, it is recommended that a system be introduced which automatic