1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1638 : 1997 BS 2782
2、 : Part 12 : Method 1223D : 1997 The European Standard EN 1638 : 1997 has the status of a British Standard ICS 23.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes Test method for the effects of c
3、yclic internal pressureThis 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 and comes into effect on 15 December 1997 BSI 1997 ISBN 0 580 28705 X BS EN 1638 : 1997 Amendments issued s
4、ince publication Amd. No. Date Text affected National foreword This British Standard is the English language version of EN 1638 : 1997 published by the European Committee for Standardization (CEN). The UK participation in its preparation was entrusted to Technical Committee PRI/61, Plastics piping s
5、ystems and components, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and pr
6、omulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. This European Standard is also incorporated into BS 2782 Methods of testing plastics: Part 12 Reinforced plastics pipes, fittings and valves,a s Method 1223D : 1997, for associ
7、ation with related test methods for plastics materials and plastics piping systems. It is also for use for the revision or amendment of other national standards as practicable, but it should not be presumed to apply to any existing standard or specification which contains or makes reference to a dif
8、ferent test method until that standard/specification has been amended or revised to make reference to this method and any requirements adjusted as appropriate. Cross-references The British Standards which implement international or European publications referred to in this document may be found in t
9、he BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. NOTE 1. In 8.6 of this standard, reference is made to method A of EN 1394, and hence that reference and the corresponding refer
10、ence in clause 2 should be regarded as dated references to the 1996 edition of EN 1394. NOTE 2. A concurrent draft for a similar purpose to EN 1394 was ISO/DIS 8521, which is not technically equivalent. Warning note. This British Standard, which is identical with EN 1638 : 1997, does not necessarily
11、 detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. Compliance with a British Standard does not of itself confer immu
12、nity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central S
13、ecretariat: rue de Stassart 36, B-1050 Brussels 1997 All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1638 : 1997 E EUROPEAN STANDARD EN 1638 NORME EUROPE ENNE EUROPA ISCHE NORM April 1997 ICS 23.040.20 Descriptors: Plastic tubes, reinf
14、orced plastics, glass reinforced plastics, thermosetting resins, pressure tests, pressure resistance, test specimen English version Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes Test method for the effects of cyclic internal pressure Syste mes de canalisations en plasti
15、ques Tubes en plastiques thermodurcissables renforce s de verre (PRV) Me thode dessai relative aux effets de la pression cyclique interne Kunststoff-Rohrleitungssysteme Rohre aus glasfaserversta rkten duroplastischen Kunststoffen (GFK) Pru fverfahren fu r die Aus-wirkungen von zyklischem Innendruck
16、This European Standard was approved by CEN on 1997-01-27. 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 referenc
17、es concerning such national standards may be obtained on application to the Central Secretariat 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
18、its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swit
19、zerland and United Kingdom.Page 2 EN 1638 : 1997 BSI 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 155, Plastics piping systems and ducting systems, the secretariat of which is held by NNI. The material-dependent test parameters and/or performance requirements
20、are incorporated in the referring standard. This standard is one of a series of standards on test methods which support System Standards for plastics piping systems and ducting systems. This European Standard shall be given the status of a national standard, either by publication of an identical tex
21、t or by endorsement, at the latest by October 1997, and conflicting national standards shall be withdrawn at the latest by October 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: A
22、ustria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative reference 3 3 Definitions 3 4 Principle 3 5 Apparatus 3 6 Test pieces 4 7
23、Test temperature 4 8 Procedure 4 9 Failure 5 10 Test report 5Page 3 EN 1638 : 1997 BSI 1997 1) 1 bar = 10 5 N/m 2 = 0,1 MPa 1 Scope This standard specifies a method for the effects of cyclic internal pressure on glass-reinforced thermosetting plastics (GRP) pipes. This standard is applicable to pipe
24、s of nominal size up to and including DN 600. NOTE. Whilst this standard refers to pipes the procedures described can be applied to fittings. 2 Normative reference This standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at th
25、e appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to, or revisions of, any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references the latest edition of the public
26、ation referred to applies. EN 1394 Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes Determination of the apparent initial circumferential tensile strength 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 cyclic pressure The pressure whi
27、ch fluctuates about a mean value at a given frequency and amplitude. It is expressed in bars 1) (or in megapascals). 3.2 mean pressure The arithmetic average of the lower and upper limits of the pressure cycle. It is expressed in bars (or in megapascals). 3.3 peak-to-peak pressure amplitude The diff
28、erence between the lower and upper pressure limits. It is expressed in bars (or in megapascals). 3.4 cycle frequency The number of cycles per unit time. It is expressed in cycles per minute. 3.5 cycle The change of pressure from the lower limit to the upper limit and then return to the lower limit.
29、3.6 leakage; weeping Passage of liquid through the pipe wall. 3.7 bursting Rupture of the pipe wall with immediate loss of test liquid. 4 Principle A test piece is subjected to a specified cyclic pressure for a specified number of cycles. Following successful completion of the cyclic test the test p
30、iece is subjected to a circumferential tensile strength test. NOTE. It is assumed that the following test parameters are set by the standard making reference to this standard: a) type of end sealing device to be used (see 5.3); b) the number of test pieces (see 6.1); c) the length of the test piece
31、(see 6.2); d) the test temperature and its tolerance (see clause 7); e) the mean pressure (see 8.2); f) the peak-to-peak pressure amplitude (see 8.2); g) the cycle frequency (see 8.5); h) the test liquid and external environment (see 8.3); i) the number of cycles (see 8.5). 5 Apparatus 5.1 Source of
32、 internal pressure, capable of both of the following: a) applying the required pressures gradually; b) maintaining the consistency of the cycle for the duration of the test. 5.2 Pressure measuring device, capable of checking conformity to the required pressure limits (see 5.1 and 8.2) under the appl
33、icable cycle conditions (see 8.5). 5.3 End sealing devices for the test pieces (see figure 1), such that the specified state of stress see item a) of the note to clause 4, and 8.3 will be induced with or without end thrust, as applicable. 5.4 A means of determining and recording the number of cycles
34、 completed.Page 4 EN 1638 : 1997 BSI 1997 Figure 1. Typical arrangement for pressure testing of pipe 6 Test pieces 6.1 Number The number of test pieces shall be as specified in the referring standard. 6.2 Length The length, L, of the test piece between the end sealing devices shall be as specified i
35、n the referring standard (see figure 1). 6.3 Conditioning Unless otherwise specified in the referring standard conditioning is not required. 7 Test temperature The test temperature and tolerance shall be as specified in the referring standard. 8 Procedure 8.1 Determine the following dimensions of th
36、e test piece: a) external diameter; b) wall thickness; c) length. 8.2 Unless otherwise specified in the referring standard, determine the pressure settings as follows: a) the mean pressure shall be equal to PN, when expressed in bar; b) the peak-to-peak pressure amplitude shall be 0,5 times PN, when
37、 expressed in bar. EXAMPLE: For a PN 10 pipe tested with a symmetrical peak-to-peak pressure amplitude of 5 bar, the lower test pressure limit is 7,5 bar and the upper limit 12,5 bar.Page 5 EN 1638 : 1997 BSI 1997 8.3 Fit the end sealing devices (see 5.3) and fill the test piece with the test liquid
38、 specified in the referring standard. Ensure that all air is expelled. The external environment shall, unless otherwise specified by the referring standard, be air. 8.4 Connect the arrangement to the pressure generating system. Prior to commencing the test ensure that both the external environment a
39、nd the test liquid are at the test temperature (see clause 7). 8.5 Bring the internal pressure to the lower limit of the cycle. Increase the internal pressure until the upper pressure limit is reached. Then reduce the pressure to the lower limit. Repeat this process using the applicable cycle freque
40、ncy given in table 1 unless otherwise specified in the referring standard, until either the test piece fails (see clause 9) or the minimum required number of cycles specified in the referring standard is reached. Table 1. Cycle frequency Nominal size Cycle frequency DN DN# 150 (16 4) cycles/min 150
41、DN# 350 (8 2) cycles/min 350 DN# 600 (4 1) cycles/min In the event of an apparatus breakdown, the test may be continued following its repair. 8.6 For test pieces that have undergone testing to the minimum required number of cycles, and for the test pieces that have not been subjected to pressure cyc
42、ling, determine and record the circumferential tensile strength, using method A of EN 1394. 8.7 Record the number of cycles to failure (see clause 9) for test pieces which fail before reaching the minimum required number of cycles. In the event of an apparatus breakdown (see 8.5), the number of cycl
43、es of the different stages may be added together to give the total number of cycles achieved. 9 Failure Failure shall comprise any type of leakage or weeping (see 3.6) or bursting (see 3.7) that occurs inside the valid failure zone (see figure 1). If leakage occurs where an end sealing device is fit
44、ted, the device may be resealed and the test continued. The resulting interruption to the test shall be recorded. 10 Test report The test report shall include the following information: a) a reference to this standard and to the referring standard; b) the full identification of the pipe tested; c) t
45、he number of test pieces; d) the dimensions of each test piece; e) the equipment details; f) the mean test pressure and peak-to-peak pressure amplitude; g) the number of cycles and the maximum and minimum cycle frequencies; h) the residual circumferential tensile strength of each cycled test piece;
46、i) the type of failure; j) the test temperature; k) any factors which can have affected the results, such as any incidents or any operating details not specified in this standard; l) the dates of commencement and completion of testing.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | |
47、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body
48、 responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest
49、 amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of stan
