1、DEUTSCHE NORM November 1997 Polyethylene (PE) pipes Test method for the resistance to internal pressure after application of squeeze-off Enalish version of DIN EN 121 06 DIN EN 12106 - ICs 23.040.20 Descriptors: Plastics, polyethylene, pipes, hydrostatic strength, testing. Kunststoff-Rohrleitungssys
2、teme - Rohre aus Polyethylen (PE) - Bestimmung der Widerstandsfhigkeit gegen Innendruck nach Abquetschen European Standard EN 12106 : 1997 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been prepared by CEN/TC 155. The responsible German
3、body involved in its preparation was the Normenausschu Kunststoffe (Plastics Technology Standards Committee), Technical Committee Prfverfahren fr Rohre. EN comprises 6 pages. No pari of this standard may be reproduced without the prior permission of Ref. No. DIN EN 12106: 1997-1 V Deutsches Institut
4、 fr Normung e. V., Berlin. uth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). English price group 05 Sales No. 1105 05.98 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12106 August 1997 ICs 23.040.20 Descriptors: Plastics, polyethylene, pipes,
5、hydrostatic strength, testing. English version Plastics piping systems Test method for the resistance to internal pressure after application of squeeze-off Polyethylene (PE) pipes Systmes de canalisations en plas- tiques - Tubes en polythylne (PE) - Mthode dessai de rsistance la pression interne apr
6、s application de lcrasement Kunststoff-Rohrleitungssysteme - Rohre aus Polyethylen (PE) - Bestim- mung der Widerstandsfhigkeit gegen Innendruck nach Abquetschen This European Standard was approved by CEN on 1997-03-28. CEN members are bound to comply with the CENKENELEC Internal Regulations which st
7、ipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards
8、 exist 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 own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards
9、 bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europische
10、s Komitee fr Normung Central Secretariat: rue de Stassart 36, 8-1050 Brussels O 1997. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 12106 : 1997 E Page 2 EN 12106: 1997 Foreword This European standard has been prepared by Techn
11、ical Committee CENTTC 155 “Plastics piping systems and ducting systems“ the secretariat of which is held by NNI. This standard is based on annex B (informative) of the Intemational Standards IS0 443711988 “Buried polyethylene (PE) pipes for the supply of gaseous fuels - Metric series - Specification
12、“, published by the International Organization for Standardization (ISO). The material-dependent parameters and/or performance requirements are incorporated in the System Standard) concerned. This standard is one of a series of standards on test methods which support System Standards for plastics pi
13、ping systems and ducting systems. 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 February 1998, and conflicting national standards shall be withdrawn at the latest by February 1998. According to
14、the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,
15、Sweden, Switzerland and the United Kingdom. Page 3 EN 12106: 1997 1 Scope This standard specifies a method for determining the resistance to intemal pressure of polyethylene (PE) pipes after being subjected to a squeeze-off procedure. 2 Normative reference This standard incorporates by dated or unda
16、ted reference, provisions from other publications. These normative references are cited at the 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 incorpo
17、rated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 921:1994 Plastics piping systems - Thermoplastics pipes - Determination of resistance to internal pressure ar constant temperature 3 Principle A polyethylene (PE) pipe, conditio
18、ned to O “C, is squeezed between two parallel circular- section bars located at right angles to the pipe centreline, at a position midway between the pipe ends. The squeeze is subsequently released after an appropriate time period. The pipe is then subjected to a hydrostatic strength test at 80 OC.
19、NOTE 1: In certain countries the technique of squeeze-off is used to restrict the flow of fluid in PE piping systems whilst effecting maintenance and repair operations. The test described herein may be used to assess the effect of squeeze-off on the strength of pipes. NOTE 2: It is assumed that the
20、following test parameters are set by the standard making reference to this standard: a) the diameter and series of the pipe to be tested (see 5.1); b) the number of test pieces (see 5.2); c) the parameters for the hydrostatic strength test at 80 “C (see 6.5). 4 Apparatus 4.1 Squeezeoff equipment, co
21、mprising a compressive loading device with a combination of a fixed bar and a moveable bar contained within a framework designed to withstand the forces generated by the squeeze-off action. Each bar shall have a circular cross section having sufficient rigidity to ensure a uniform separation between
22、 and along the bars in the course of squeeze-off. Each bar shall have the same diameter which shall be not less than the applicable minimum value given in table 1. The moveable bar may be hydraulically or mechanically operated to achieve the applicable level of squeeze-off given in table 1. Page 4 E
23、N 12106: 1997 I Nominal outside Minimum bar diameter Squeeze-off level L diameter dnL 63 25,O 80 63 250. 6.4 Maintain the squeeze-off level for a hold time period of (60 f 5) min. Immediately after that hold time has elapsed, release the squeeze progressively so that the squeeze applied by the bars
24、is fully released within 1 min. 6.5 Prepare the test piece for determination of hydrostatic strength at 80 “C in accordance with EN 921 :I 994 and conduct that test using the pressure, testing time and failure crteria as specified in the referring standard see c) of note 2 to clause 31. 6.6 After te
25、sting, inspect the test piece and record the position and mode of any failure, as applicable (see 6.5). Page 6 EN 12106: 1997 7 Testreport The test report shall include the following information: a) the reference to this standard and to the referring standard; b) a complete identification of the pip
26、e, including manufacturer, type of material (e.g. PE 80) and production date: c) the nominal diameter, dn, of the pipe; d) the minimum wall thickness, emin, of the pipe; e) the squeeze-off bar diameter; f) the final distance, eq, between squeeze-off bars; g) the test pressure; h) the duration of testing at 80 OC; i) details of the position and mode of any failure: j) any factors which may have affected the results, such as any incidents or any operating details not specified in this standard; k) the date of test.
