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1、BRITISH STANDARD BS EN ISO 9967:2007 Thermoplastics pipes Determination of creep ratio ICS 23.040.20 ? Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking
2、 permitted without license from IHS -,-,- BS EN ISO 9967:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2008 BSI 2008 ISBN 978 0 580 56388 1 National foreword This British Standard is the UK implementation of EN ISO 9967:200
3、7. It supersedes BS EN ISO 9967:1995 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee PRI/88, Plastics piping systems, to Subcommittee PRI/88/4, Test methods. A list of organizations represented on this committee can be obtained on request to its secre
4、tary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication DateComments Copyright Br
5、itish Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking permitted without license from IHS -,-,- EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9967 November 20
6、07 ICS 23.040.20Supersedes EN ISO 9967:1995 English Version Thermoplastics pipes - Determination of creep ratio (ISO 9967:2007) Tubes en matires thermoplastiques - Dtermination du taux de fluage (ISO 9967:2007) Thermoplastische Rohre - Bestimmung des Verformungsverhaltens (ISO 9967:2007) This Europe
7、an Standard was approved by CEN on 2 November 2007. 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 con
8、cerning such national standards may be obtained on application to the CEN Management Centre 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
9、own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lith
10、uania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 200
11、7 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9967:2007: E Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26
12、MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword This document (EN ISO 9967:2007) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the transport of fluids“ in collaboration with Technical Committee CEN/TC 155 “Plastics pip
13、ing systems and ducting systems” the secretariat of which is held by NEN. 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 2008, and conflicting national standards shall be withdrawn at the lat
14、est by May 2008. This document supersedes EN ISO 9967:1995. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
15、 France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 9967:2007 has been approved by CEN as a EN ISO 9
16、967:2007 without any modification. BS EN ISO 9967:2007 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking permitted without license from IHS -,-,- Refere
17、nce number ISO 9967:2007(E) INTERNATIONAL STANDARD ISO 9967 Second edition 2007-11-15 Thermoplastics pipes Determination of creep ratio Tubes en matires thermoplastiques Dtermination du taux de fluage BS EN ISO 9967:2007 Copyright British Standards Institution Provided by IHS under license with BSI
18、- Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking permitted without license from IHS -,-,- ii Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for
19、Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Symbols. 1 3 Principle. 1 4 Apparatus 2 5 Test pieces 2 6 Conditioning 4 7 Test procedure 4 8 Determination of the creep ratio . 5 9 Test r
20、eport . 9 Annex A (informative) Creep in thermoplastics material . 10 Bibliography. 12 BS EN ISO 9967:2007 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networ
21、king permitted without license from IHS -,-,- iv Foreword 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 carried out through ISO technical committees. Each
22、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. ISO collaborates closely with the International
23、 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 International Standards. Draft International Standards
24、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 elements of this document may be the subject of
25、patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 9967 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves of plastic mat
26、erials and their accessories Test methods and basic specifications. This second edition cancels and replaces the first edition (ISO 9967:1994), which has been technically revised. BS EN ISO 9967:2007 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy L
27、icensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking permitted without license from IHS -,-,- v Introduction Experience shows that when a pipe is installed in the soil in accordance with an appropriate code of practice its increase in deflection virtually
28、 stops after a short period. Depending on the soil and installation conditions this period will vary but normally not exceed two years. Therefore, the two-year creep ratio as determined in accordance with this International Standard is intended for use when long-term static calculations are carried
29、out. The theory of creep in thermoplastics materials is briefly explained in Annex A. For experiments, the test can be carried out based on other ages of the test pieces, other test temperatures and/or other test durations. BS EN ISO 9967:2007 Copyright British Standards Institution Provided by IHS
30、under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking permitted without license from IHS -,-,- blank Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boe
31、ing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking permitted without license from IHS -,-,- 1 Thermoplastics pipes Determination of creep ratio 1 Scope This International Standard specifies a method for determining the creep ratio of thermoplastics pipes having a
32、circular cross-section. 2 Symbols Unit dn nominal diameter of pipe mm di inside diameter of test piece of pipe mm F loading force kN F0 pre-load force N L length of test piece mm y0 measured initial deflection mm Yt calculated deflection at time t mm Y2 extrapolated two-year deflection mm vertical d
33、eflection used to determine the loading force mm creep ratio 3 Principle A cut length of pipe is placed between two parallel flat horizontal plates and a constant compressive force is applied for 1 008 h (42 days). The deflection of the pipe is recorded at specified intervals so as to prepare a plot
34、 of pipe deflection against time. The linearity of the data is analysed and the creep ratio is calculated as the ratio between the two years extrapolated deflection value and the measured 6 min (0,1 h) deflection. NOTE It is assumed that the test temperature, as appropriate (see 7.1), is set by the
35、referring standard. BS EN ISO 9967:2007 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 4 Apparatus 4.1 Com
36、pressive loading machine, capable of applying via plates (4.2) and maintaining to within 1 % both the applicable pre-load force, F0 (see 7.4), and the necessary loading force, F (see 7.5), on the pipe. The force may be applied either directly or indirectly, e.g. by use of a lever arm arrangement. 4.
37、2 Two plates, through which the compressive force can be applied to the test piece. The plates shall be flat, smooth and clean and shall not deform during the test to an extent that would affect the results. The length of each plate shall be at least equal to the length of the test piece. The width
38、of each plate shall be not less than the maximum width of the contact surface with the test piece while under load plus 25 mm. 4.3 Dimensional measuring devices, capable of determining: individual values for the length of a test piece (see 5.2) to within 1 mm; the inside diameter of a test piece to
39、within 0,1 mm or 0,2 % di, whichever is the greater; the change in inside diameter of a test piece in the direction of loading with an accuracy of 0,1 mm or 0,1 % of the deflection, whichever is the greater. The change in inside diameter may be measured inside the pipe or be determined from the move
40、ment of the upper plate. In case of dispute the inside diameter shall be used as reference. An example of a device for measuring the inside diameter of corrugated pipes is shown in Figure 1. Figure 1 Example of device for measuring the inside diameter of a corrugated pipe 4.4 Timer, capable of deter
41、mining the first 6 min with an accuracy to within 1 s and the remaining times to within 0,1 % (see 7.5 and 7.6). 5 Test pieces 5.1 Marking and number of test pieces The pipe of which the creep ratio is to be determined shall be marked on its outside with a line along one generatrix for its full leng
42、th. Three test pieces, A, B and C respectively, shall be taken from this marked pipe such that the ends of the test pieces are perpendicular to the pipe axis and their lengths conform to 5.2. 5.2 Length of test pieces 5.2.1 The length of each test piece shall be determined by calculating the arithme
43、tic average of three to six measurements of length equally spaced around the perimeter of the pipe as given in Table 1. The length of each test piece shall conform to 5.2.2, 5.2.3, 5.2.4 or 5.2.5, as applicable. BS EN ISO 9967:2007 Copyright British Standards Institution Provided by IHS under licens
44、e with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:43:26 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 Each of the three to six length measurements shall be determined to within 1 mm. For each individual test piece, the smallest o
45、f the three to six measurements shall not be less than 0,9 times the largest length measurement. Table 1 Number of length measurements Nominal diameter, dn, of pipe mm Number of length measurements dn u 200 3 200 dn 500 4 dn W 500 6 5.2.2 For pipes that have a nominal diameter, dn, less than or equa
46、l to 1 500 mm, the average length of the test pieces shall be (300 10) mm. 5.2.3 For pipes that have a nominal diameter, dn, larger than 1 500 mm, the average length of the test pieces in millimetres shall be at least 0,2dn. 5.2.4 Structured wall pipes with perpendicular ribs, corrugations or other
47、regular structures shall be cut such that each test piece contains a whole number of ribs, corrugations or other structures. The cuts shall be made at the mid-point between the ribs, corrugations or other structures. The length of the test pieces shall be the minimum whole number of ribs, corrugations or other structures resulting in a length of 290 mm or greater, or 0,2dn or greater for pipes larger than 1 500 mm. Key p pitch L test piece length Figure 2 Test piece cut out of a perpendicularly ribbed pipe BS EN ISO 9967:2007 Copyright
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