1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 751-1 : 1997 The Eu
2、ropean Standard EN 751-1 : 1996 has the status of a British Standard ICS 91.140.40; 91.140.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water Part 1. Anaerobic jointing c
3、ompoundsBS EN 751-1 : 1997 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1997 BSI 1997 The following BSI references relate to the work on this standard: Commit
4、tee reference PSE/2 Draft for comment 94/708883 DC ISBN 0 580 27656 2 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PSE/2, Jointing materials and compounds
5、, upon which the following bodies were represented: Asbestos Information Centre Ltd. British Adhesives and Sealants Association British Compressed Gases Association British Hydromechanics Research Group Chartered Institution of Water and Environmental Management Energy Industries Council Industrial
6、Water Society LP Gas Association Water Services Association of England and WalesBS EN 751-1 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 751-1 3ii BSI 1997 BS EN 751-1 : 1997 National foreword This Part of BS EN 751 has been pre
7、pared by Technical Committee PSE/2, and is the English language version of EN 751-1 : 1996, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water Part 1: Anaerobic jointing compounds, published by the European Committee for Standardization (CEN).
8、It supersedes BS 6956 : Part 7 : 1992 which is withdrawn. Cross-references International standards Corresponding British Standard ISO 7-1 BS 21 Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions) ISO 228-1 BS 2779 Specificatio
9、n for pipe threads for tubes and fittings where pressure-tight joints are not made on the threads (metric dimensions) BS 5380 Specification for hydraulic port and stud coupling using O-ring sealing and G series fastening threads EN ISO 2160 BS EN ISO 2160 Petroleum products, Corrosiveness to copper.
10、 Copper strip test EN 437 BS EN 437 Specification for test gases, test pressure and categories of appliance, for gas appliances EN 10242 BS EN 10242 Threaded pipe fittings in malleable cast iron Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of
11、pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, 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 Secretariat: rue de Stass
12、art 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. 751-1 : 1996 E EUROPEAN STANDARD EN 751-1 NORME EUROPE ENNE EUROPA ISCHE NORM December 1996 ICS: 21.140; 23.040.80 Descriptors: Pipe fittings, gas pipes, water pipes, hot water, threaded fittings, sealing materials, definitions,
13、 specifications, tests, effectiveness, marking English version Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water Part 1: Anaerobic jointing compounds Mate riaux de tanche ite pour raccords filete se n contact des gaz de la 1e re, 2e me et3e me
14、 famille et de leau chaude Partie 1: Composition de tanche ite anae robie Dichtmittel fu r Gewindeverbindungen in Kontakt mit Gasen der 1., 2. und 3. Familie und Heiwasser Teil 1: Anaerobe Dichtmittel This European Standard was approved by CEN on 1996-11-24. CEN members are bound to comply with the
15、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 concerning such national standards may be obtained on application to the Central Secretariat or
16、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 own language and notified to the Central Secretariat has the same status as the official versio
17、ns. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 751-1 1996 BSI 1997 Foreword This European Standard has been prepa
18、red by Technical Committee CEN/TC 108, Sealing materials and lubricants for gas appliances and gas equipment, the secretariat of which is held by NNI. 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
19、by June 1997, and conflicting national standards shall be withdrawn at the latest by June 1997. This European Standard consists of the following Parts: Part 1: Anaerobic jointing compounds Part 2: Non-hardening jointing compounds Part 3: Unsintered PTFE tapes This European Standard has been prepared
20、 under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Eur
21、opean Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 Definitions 4 4 Classificat
22、ion of jointing compounds 4 5 Requirements 4 5.1 Requirements to be met by the jointing compound as received 4 5.2 Requirements to be met by the jointing compound after assembly 4 5.3 Re-test 4 6 Test material and documentation 5 6.1 Test material 5 6.2 Test documentation 5 7 Test methods 5 7.1 Test
23、s of the jointing compound as received 5 7.2 Test of the jointing compound after assembly 5 8 Marking and Instructions 7 8.1 Marking on packages 7 8.2 Instructions 7Page 3 751-1 1996 BSI 1997 Table 1. Application of anaerobic jointing compounds Fluid Temperature range C Pressure-limit bar Typical ap
24、plication 1st, 2nd, 3rd family gases 1) 220 to 125 5 gas appliances gas equipment installation hot water 2) up to 130 7 heating systems 1) Some jointing compounds can be used for other applications. For such applications, which are outside the scope of this European Standard, the purchaser should co
25、nsult the manufacturer. 2) Sealing properties and mechanical strength are influenced by various factors such as nature of metal, form, roughness and size of thread, cleanness of the joint from cutting oil, etc. Non-hardening sealing materials in the form of e.g. jointing compounds paste are covered
26、by EN 751-2 and in the form of PTFE-tapes are covered by EN 751-3. Introduction This European Standard specifies requirements and test methods for anaerobic jointing compounds for metallic threaded joints. These liquid, gellike or pasty sealants cure inside the gap of the threaded joint by the absen
27、ce of oxygen catalyzed by contact with the metal of the threaded joint. By the curing reaction, which is time and temperature dependent, a polymeric material is formed, which fills the gap and micro-imperfections of the thread and binds strongly to the metal surfaces thus sealing and bonding the thr
28、eaded joint. Anaerobic jointing compounds can be formulated to harden to different strength levels. Users of such materials should therefore consult the manufacturers information to ensure that the grade is suitable for the application e.g. the size of the thread, the materials of the joints, and wh
29、ether the joint needs to be dismantled. Since not only the mechanical strength of the threaded joint but also the sealing properties of the anaerobic sealing material are influenced by the preparation of the threads and other factors, the application instructions provided by the manufacturer of the
30、sealing material should be followed. It is important that only Competent Persons should be working on gas installations. For applications outside the scope of this Standard the manufacturer should be consulted prior to use. It is important to note that threaded joints once finally assembled should n
31、ever be adjusted. Where it proves necessary to dismantle the joints, they should be unscrewed completely, cleaned and assembled once again using fresh jointing compound. A universally applicable jointing compound may be used for all gas, potable water, and hot water installations. In respect of pote
32、ntial adverse effects of the jointing compounds covered by this European Standard on the quality of water intended for human consumption this Standard provides no information as to whether the jointing compounds may be used without restriction in any of the Member States of the EU or EFTA. The use a
33、nd characteristics of the jointing compounds should comply with current regulations, where they exist, depending on the acceptance of verifiable European criteria. 1 Scope This European Standard specifies requirements and test methods for anaerobic jointing compounds (hereafter referred to as jointi
34、ng compounds) suitable for sealing threaded metallic joints such as those specified in ISO 7-1. These jointing compounds are for use in contact with 1st family gases (town gas), 2nd family gases (natural gas) and 3rd family gases (liquefied petroleum gases (LPG) not including LPG in the liquid form)
35、 and hot water of heating systems according to table 1. 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.
36、For dated 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. ISO 7-1 Pipe threads where pressure-tight
37、joints are made on the threads Part 1: Dimensions, tolerances and designation ISO 228-1 Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation EN ISO 2160 Petroleum products Corrosiveness to copper Copper strip test (ISO 2160 : 1985, inclu
38、ding Corrigendum 1 : 1993) EN 437 Test gases Test pressures Appliance categories EN 10242 Threaded pipe fittings in malleable cast iron prEN 10255 Carbon steel tubes suitable for welding or threading prEN 12164 Copper and copper alloys Rod for free machining purposesPage 4 751-1 1996 BSI 1997 3 Defi
39、nitions For the purposes of this European Standard the following definitions apply: 3.1 anaerobic jointing compound (referred to hereafter as jointing compound) Sealing material applied as a liquid, gel or paste to the threads (without the addition of sealant supporting bases) which cures inside the
40、 gap of the threaded joint in the absence of oxygen and catalysed by metal ions. 3.2 gas family For further information on types of gases see EN 437. 3.3 batch Any quantity of jointing compound manufactured in a single mix at one time. 4 Classification of jointing compounds There are two classes of
41、anaerobic jointing compounds suitable for fine (I) and coarse (H) threads according to table 2. Table 2. Classification of anaerobic jointing compounds Class Thread Nominal Size I ISO 7-1 taper/parallel and taper/taper DN# 10 1) H ISO 7-1 taper/parallel and taper/taper 10 DN# 50 1) Class I anaerobic
42、 jointing compounds may also be used for other dimensions when the number of turns of the thread is 7,5 cm -1 . 5 Requirements 5.1 Requirements to be met by the jointing compound as received 5.1.1 Visual quality The jointing compound shall be of a homogenous liquid to pasty consistency easily applic
43、able to threads. It shall also be free of lumps or other deleterious materials when tested in accordance with the method described in 7.1.1. 5.1.2 Chemical stability The jointing compound shall have a gel time not less than 5 min at 100 C when tested in accordance with the method described in 7.1.2.
44、 5.1.3 Corrosive properties The jointing compound shall not cause corrosion of aluminium, brass, copper, low carbon steel or zinc surfaces when tested in accordance with 7.1.3. The appearance of copper and brass test strips shall give a classification 3 or less in accordance with EN ISO 2160. 5.1.4
45、Storage properties The storage life of the jointing compound shall be at least one year in its original unopened container when stored at a temperature less than 25 C, indicated and declared by the manufacturer. 5.2 Requirements to be met by the jointing compound after assembly 5.2.1 Sealing propert
46、ies When tested in accordance with the methods described in 7.2.1 the jointing compound shall not disintegrate or flow out of the joint and shall not permit any leakage when each test assembly is tested in accordance with 7.2.1.2 to 7.2.1.6 in sequence. 5.2.1.1 Soundness When pressurized within 1 h
47、after preparation all the joints in the test assemblies shall not leak when tested in accordance with 7.2.1.2. 5.2.1.2 Resistance to gas condensates The sealing properties of the jointing compound shall not be impaired by liquid hydrocarbon gas condensate when tested in accordance with 7.2.1.3. 5.2.
48、1.3 Resistance to hot water The sealing properties of the jointing compound shall not be impaired by hot water when tested in accordance with 7.2.1.4. 5.2.1.4 Resistance to temperature cycling The sealing properties of the jointing compound shall not be impaired by temperatures of2(20 2) C and (150
49、2) C when tested in accordance with 7.2.1.5. 5.2.1.5 Resistance to vibration The sealing properties of the jointing compound shall not be impaired by vibration when tested in accordance with 7.2.1.6. 5.2.2 Compatibility with foam forming leak testers The jointing compound shall not destroy the film of aqueous leak test fluids within 1 min when tested in accordance with 7.2.2. 5.3 Re-test If more than one joint in any test assembly shall fail, throughout the tests specified in 7.2.1.2 to 7.2.1.6,n
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