1、BRITISH STANDARD Elastomers for gas pressure regulators and associated safety devices for inlet pressures up to 100 The European Standard EN 13787:2001 has the status ofa British Standard ICs 23.040.80 bar BS EN 13787:200 1 BS EN 13787:2001 Amd. No. National foreword Date Comments This British Stand
2、ard is the official English language version of EN 13787:2001. The UKparticipation in its preparation was entrusted to Technical Committee GSE/32, Gas governors, which has the responsibility to: - - aid enquirers to understand the text; present to the responsible European committee any enquiries on
3、the interpretation, or proposals for change, and keep the 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. Cr oss-r e fer enc e s The Brit
4、ish 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”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A Britis
5、h 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 Standard does not of itself confer immunity from legal obligations. This British Standard. having - been prepared und
6、er the direction of the Engineering Summary Of pages Sector Policv and Stratew This document comprises a front cover, an inside front cover, the EN title page, -_ Committee, was published pages 2 to 10. an inside back cover and a back cover. under the authority of the Standards Policy and Strategy C
7、ommittee on The BSI copyright date displayed in this document indicates when the document was last issued. 30 November 2001 O BSI 30 November 200 1 ISBN O 580 36790 8 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13787 October 2001 ICs 83.060; 83.140.50 English version Elastomers for gas pres
8、sure regulators and associated safety devices for inlet pressures up to 100 bar Elastomres pour rgulateurs de pression de gaz et dispositifs de scurit associs pour pressions amont jusqu 100 bar Elastomere fr Gas-Druckregelgerte und zugehrige Sicherheitseinrichtungen fr Eingangsdrcke bis 1 O0 bar Thi
9、s European Standard was approved by CEN on 15 September 2000 CEN members are bound to comply with the CENKENELEC 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 refere
10、nces concerning such national standards may be obtained on application to the 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
11、its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain
12、, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national
13、 Members. Ref. No. EN 13787:2001 E EN 13787:2001 (E) Contents Page Foreword 3 1 2 3 4 4.1 4.2 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Scope 4 Normative references 4 Terms and definitions 4 Characteristics . 5 General requirements 5 Additional characteristics . 6 Test methods for general requirements 7 General
14、 conditions of testing . 7 Hardness . 7 Tensile strength and elongation at break 7 Compression set 7 Resistance to ageing . 7 Resistance to gas 7 Resistance to lubricants . 7 Annex A (informative) Additional characteristics 8 A.l General 8 A.2 Resistance to ozone 8 A.3 Resistance to abrasion 8 A.4 R
15、esistance to tear 8 Annex B (normative) Special national conditions . 9 B.l Special national conditions 9 B.2 Special national condition for Sweden 9 Bibliography 10 2 EN 13787:2001 (E) Foreword This European Standard has been prepared by Technical Committee CEN/TC 235 “Gas pressure regulators and a
16、ssociated safety devices for use in gas transmission and distribution“, the secretariat of which is held by UNI. 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 April 2002, and conflicting nationa
17、l standards shall be withdrawn at the latest by April 2002. This European Standard includes one informative annex (Annex A) and one normative annex (Annex B related to a special national condition for Sweden). According to the CENKENELEC Internal Regulations, the national standards organizations of
18、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, Sweden, Switzerland and the United Kingdom. 3 EN 13787:2001 (E) 1 Scope This
19、European Standard specifies the minimum requirements for elastomeric materials intended to be used as static seals, dynamic seals or diaphragms in the gas pressure regulators covered by EN 334 and in the safety devices for gas pressure regulating stations and installations covered by the correspondi
20、ng European Standards, as well as the relevant test methods to assess these requirements. This European Standard applies to elastomeric materials for use with gases of the first and second gas families to EN 437, for inlet pressures less than or equal to 100 bar, and in an operating temperature rang
21、e between -10 OC, (or -20 OC when applicable), and +60 OC. This European Standard also gives some additional characteristics and recommendations for their application likely to be requested for elastomers in the order specifications, and the corresponding test methods (see informative Annex A). This
22、 European Standard only applies for type testing. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For da
23、ted references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 334, Gas pressure regu
24、lators for inlet pressures up to 100 bar. EN 437, Test gases - Test pressures - Appliance categories. EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment. IS0 37, Rubber vulcanized or thermoplastic - Determination of tensile stress-strain properties. IS0 48, Rubber
25、, vulcanized or thermoplastic - Determination of hardness (hardness between 10 IRHD and 100 IRHD). IS0 188, Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests. IS0 81 5, Rubber, vulcanized or thermoplastic - Determination of compression set at ambient, elevated or low
26、 temperatures. IS0 181 7, Rubber, vulcanized - Determination of the effect of liquids. 3 Terms and definitions For the purposes of this European Standard, the following definitions apply: 3.1 static seal component which ensures a seal between two parts of a gas pressure regulator or parts of its ass
27、ociated safety devices which do not have relative movement (?O? rings, sheet gaskets, etc.) NOTE Adapted from EN 549. 4 EN 13787:2001 (E) 3.2 dynamic seal component which ensures a seal between two parts of a gas pressure regulator or parts of its associated safety devices which have relative moveme
28、nt (lip seals, some O rings) NOTE Adapted from EN 549. 3.3 diaphragms 3.3.1 diaphragm membrane of rubber material located in a fixture and serving as a flexible gas tight partition between two chambers EN 5491 3.3.2 main diaphragm diaphragm, the function of which is to detect the feedback of the con
29、trolled variable and/or the diaphragm which provides the thrust to move the control member EN 3341 3.3.3 control member movable part of the regulator which is positioned in the flow path to restrict the flow through the regulator. A control member may be a plug, ball, disk, vane, gate, diaphragm, et
30、c. EN 3341 3.4 seat ring part assembled in a component of the regulator to provide a removable soft seat EN 3341 4 Characteristics 4.1 General requirements Elastomeric materials used for non reinforced diaphragms and static and dynamic seals, shall conform to the required values and tolerances given
31、 in Table 1. Test methods are detailed in clause 5. All materials shall be free from porosity, inclusion, blisters and surface imperfections visible to the naked eye. 5 EN 13787:2001 (E) Table 1 - Requirements of elastomers for seals and diaphragms Property Units Hardness Class 50 60 80 70 90 Hardne
32、ss IRHD M Pa % f5 f5 f5 f5 +3 1-5 Tolerances on stated nominal hardness Tensile strength, minim um 6 400 9 300 9 200 10 150 10 80 Elongation at break, minimum Compression set a - at 70 “C, after 24 h - where applicable, at -1 O “C after 24 h or at -20 “C after 24 h Resistance to ageing - Change in h
33、ardness - Change in tensile strength - Change in elongation at break Resistance to gas (n-pentane) - Change in mass after immersion (72 h, 23 “C) - Change in mass after drying (168 h, 40 OC), maximum Resistance to lubricants Oil IRM 902, 168 h at 70 “C - Change in hardness - Change in mass % % 25 40
34、 50 25 40 50 25 40 50 25 40 50 25 40 50 IRHD % % % % f 10 f 15 +IO/-25 +IO/-5 +5/-10 f 10 f 15 +IO/-25 +IO/-5 +5/-10 f 10 f 15 +IO/-25 +IO/-5 +5/-10 f8 f 15 +IO/-25 +IO/-5 +5 1-8 f6 f 15 +IO/-25 +IO/-5 +5 1-8 IRHD % f 10 +I 5 / -1 O f 10 +I 5 / -1 O f 10 +I 5 / -1 O f 10 +I 5 / -1 O f 10 +I 5 / -1 O
35、 a When the diaphragm has a function of detection, this test is not applicable (see 4.2.2). Materials used for reinforced diaphragms should meet the requirements of Table 1. Moreover, specific additional tests may be necessary. 4.2 Additional characteristics 4.2.1 The requirements given in 4.1 are i
36、ntended for general use, however, for some applications, particularly with regard to the design of the regulator or the safety device, and according to the provisions of the order specification, additional characteristics may be asked for. For testing these additional characteristics, the test metho
37、ds given in informative Annex A should be used, taking into account test conditions and assessment criteria set up in the order specification. For such additional characteristics, the 4.2.2 to 4.2.4 should be considered. 4.2.2 For parts in contact with the atmosphere, under normal conditions of use,
38、 elastomers resistant to ozone should be used. In particular, this characteristic should be taken into account when the diaphragm has a function of detection. 4.2.3 Where the diaphragm is used as a sensing system, compression set is not considered to be relevant and should be replaced by a type test
39、 in the regulator standard EN 334 or in the appropriate EN standard for safety devices, as applicable. 4.2.4 abrasion could be introduced as quoted in informative Annex A. For seat rings the values are the same as in Table 1, but additional tests such as tear strength and 6 EN 13787:2001 (E) 5 Test
40、methods for general requirements 5.1 General conditions of testing Unless otherwise specified, tests are carried out at a temperature of (23 f 2) OC. 5.2 Hardness The hardness is measured by IRHD, preferably according to the micro-test method specified in IS0 48. 5.3 Tensile strength and elongation
41、at break Tensile strength and elongation at break are measured according to IS0 37 and expressed in MPa and percentage respectively. The test is performed preferably on dumb bell test pieces of type 2. 5.4 Compression set Tests are carried out according to IS0 815 (type B test piece) under the follo
42、wing conditions: - at high temperature: after 24 h at 70 OC; - at low temperature: after 24 h at -10 OC or -20 OC. 5.5 Resistance to ageing Changes in hardness, tensile strength, elongation at break are measured to 5.2 and 5.3 respectively after ageing in accordance to IS0 188, at a temperature of 7
43、0 OC for 168 h (7 days). 5.6 Resistance to gas O Resistance to gas is measured in percentage of change in mass after immersion in n-pentane (72-2) h at (23 f 2) OC, and after drying (168-02 ) h at 40 OC, according to the test method given in IS0 1817. 5.7 Resistance to lubricants Resistance to lubri
44、cants is measured according to the test method given in IS0 1817, under the following specific conditions: O - immersion during (l68-, ) h in oil IRM 902 at 70 OC; - changes in mass and hardness are determined with reference to the initial mass and hardness of the samples. 7 EN 13787:2001 (E) Annex
45、A (informative) Add it i on al characteristics A.l General In order to meet some special provisions of the order specifications, in particular for specific applications as stated in 4.2, elastomer materials should have additional specific characteristics of resistance to ozone, resistance to abrasio
46、n or resistance to tear. The corresponding limit values and particular test conditions, if applicable, are defined in the order specifications. Unless otherwise specified, the test methods given in A.2 to A.4 should be applied. A.2 Resistance to ozone Where applicable, resistance to ozone is measure
47、d according the test method given in IS0 1431-1, with the following test criteria: - ozone concentration: (25 f 5) pphm - temperature: (40 f 2) “C - exposure time: (483 - relative humidity: (55 f IO) % - elongation: (20 f 2) % for hardness classes 50, 60 and 70; (1 5 f 2) % for hardness class 80; (I
48、O f 1) % for hardness class 90; - view with 7-fold magnification; - assessment: no cracks. A.3 Resistance to abrasion The relevant test method is specified in IS0 4649, method A. A.4 Resistance to tear The relevant test method is specified in IS0 34-1, method B, procedure a). 8 EN 13787:2001 (E) Ann
49、ex B (normative) Special national conditions B.l Special national conditions National characteristic or practice that cannot be changed even over a long period, e.g. climatic conditions, electrical earthing conditions. If it affects harmonization, it forms part of the European Standard or Harmonization Document. For the countries in which the relevant special national conditions apply these provisions are normative, for other countries they are informative. B.2 Special national condition for Sweden In Sweden the subject dealt with in this European Standard is covered by
