1、Auaust 1997 DEUTSCHE NORM Sealing materials for metallic threaded joints in contact with Ist, 2nd and 3rd family gases and hot water Part 2: Non-hardening jointing compounds English version of DIN EN 751-2 DIN - EN 751-2 ICs 21.1 40; 23.040.80 Descriptors: Gas pipes, sealing materials, threaded join
2、ts. Supersedes parts of DIN 30660, June 1982 edition. Dichtmittel fr metallene Gewindeverbindungen in Kontakt mit Gasen der 1 ., 2. und 3. Familie und Heiwasser - Teil 2: Nichtaushrtende Dichtmittel European Standard EN 751 -2 : 1996 has the status of a DIN Standard. A comma is used as the decimal m
3、arker. National foreword This standard has been prepared by CEN/TC 108. The responsible German body involved in its preparation was the Normenausschu Gastechnik (Gas Tech- nology Standards Committee). This standard has been included in the body of DVGW Codes of practice for gas. This standard is lar
4、gely based on DIN 30660. Since a European Standard has not yet been prepared to deal with the effects of sealing materials on drinking water, this standard does not cover sealing materials for use in drinking water supply systems. Where it is intended to use class ARp jointing compounds for such sys
5、tems (cf. Introduction), these compounds shall conform not only to this standard but also to the Verordnung ber Allgemeine Bedingungen fr die Versorgung mit Wasser (German Regulation on general conditions of water supply), and the relevant KTW-Empfehlungen (KTW Recommendations) on non-metallic mater
6、ials in contact with drinking water, issued by the Bundesgesundheitsministerium (German Federal Ministry of Health). DIN 2299-1 and DIN IS0 228-1 are the standards corresponding to International Standards IS0 7-1 and IS0 228-1, respectively, referred to in clause 2 of the EN. Amendments Parts of DIN
7、 30660, June 1982 edition, have been superseded by the specifications of EN 751-2. Previous editions DIN 30660: 1973-09, 1982-06. National Annex NA Standard and other document referred to (and not included in Normative references) DIN 2999-1 Pipe threads for tubes and fittings - Parallel internal th
8、reads and taper external threads - Thread dimensions Verordnung ber Allgemeine Bedingungen fr die Versorgung mit Wasser (German Regulation on general conditions of water supply), as of 20 June 1980, BGBI. (German Federal Law Gazette) I, p. 750 EN comprises 13 pages. No pari of this standard may be r
9、eproduced without the prior permission of Ref. No. DIN EN 751 -2 : 1997-0 V Deutsches Institut fur Nonung e VI Berlin Luth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen) English price group 06 Sales No 1106 O2 98 EUROPEAN STANDARD NORME EUROPENNE EUROP
10、ISCHE NORM EN 751-2 December 1996 ICs 21.140; 23.040.80 Descriptors: Gas pipes, sealing materials, threaded joints. English version Sealing materials for metallic threaded joints in contact with Ist, 2nd and 3rd family gases and hot water Part 2: Non-hardening jointing compounds Materiaux dtanchit p
11、our raccords Dichtmittel fr metallene Gewinde- filets en contact des gaz de la 1 re, verbindungungen in Kontakt mit 2me et 3me famille et de leau Gasen der 1 ., 2. und 3. Familie und chaude - Partie 2: Composition Heiwasser - Teil 2: Nichtaushrtende dtanchit non durcissante Dichtmittel This European
12、 Standard was approved by CEN on 1996-1 1-24. 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 references concerning
13、 such national stand- ards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards 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 lang
14、uage and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain,
15、Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 8-1050 Brussels O 1996. CEN - All rights of exploitation in any form and by any means reserved worldwide for
16、CEN national members. Ref. No. EN 751 -2 : 1996 E Page 2 EN 751 -2 : 1996 Contents Page Foreword 2 Introduction . 3 1 Scope 4 2 Normative references 4 3 Definitions 4 4 Classification of jointing compounds . 5 5 Requirements . 5 5.1 Requirements to be met by the jointing compound as received . 5 5.2
17、 Requirements to be met by the jointing compound after assembly 6 Page 6 Test material and documentation 7 6.1 Test material . 7 6.2 Test documentation . 7 7 Test methods . 8 7.1 Test methods for jointing compounds as received 8 7.2 Test of jointing compounds after 8 Marking and instruction . .12 8.
18、1 Marking on packages . .12 8.2 Instructions . .13 assembly 9 Foreword This European Standard has been prepared by Technical Committee CEN/TC 1 08 Sealing materials and lubricants for gas appliances and gas equipment, the Secretariat of which is held by NNI. This European Standard comprises the foll
19、owing Parts: Part 1 Anaerobic jointing compounds Part 2 Non-hardening jointing compounds Part 3 Unsintered PTFE tapes This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association and supports essential requirements of the re
20、levant EU Directives. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by June 1997 at the latest. In accordance with the CENKENELEC Internal Regulations, the following
21、 countries are bound to implement this European Standard: 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. Page 3 EN 751 -2 : 1996 Introduction
22、This European Standard specifies requirements and test methods for non-hardening sealing materials (jointing compounds) for metallic threaded joints. These jointing compounds applied as liquid, gel, paste or tape of non-woven synthetic fibres impregnated with jointing compound paste do at the most o
23、nly partly harden or cure. This enables the threaded joint to be easily dismantled with commercial tools at ambient temperatures without damage of the threads. There are three classes of jointing compounds defined by their properties and application range. Class A jointing compounds are suitable for
24、 normal installation purposes for Ist, 2nd and 3rd family gases and heating systems. Class B jointing compounds are normally used in gas appliances and their auxiliary equipment, whereas Class C jointing compounds are for use in LPG storage application. Jointing compounds may be suitable for one or
25、more classes. A universally applicable jointing compound may be used for all gas, potable water, and hot water i nstallat ion. In respect of potential adverse effects of the jointing compounds covered by this European Standard on the quality of water intended for human consumption this Standard prov
26、ides 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 and characteristics of the jointing compounds should comply with current regulations, where they exist, depending the acceptance of verifiable European crit
27、eria. Since the application techniques - sometimes due to different pressure limits and safety requirements - differ from country to country, it is difficult to harmonise the existing national standards and approval requirements for Class A jointing compounds. One particular point relates to the use
28、 of sealant supporting bases (e.g. hemp, flax or synthetic fibres). Whilst these should not be used to fill large gaps between bad fitting threads, in some countries they may be used to ensure that the jointing compound remains in its position on the male thread and is not stripped off during assemb
29、ly of the joint. It will be up to the manufacturers handling instructions (and the country of use) whether jointing compounds of Classs A will be applied with or without such sealant supporting bases. Supporting bases are not used with Classes B and C jointing compounds. The adjustment of prefabrica
30、ted parts of an installation requires sometimes the assembled taper/parallel threaded joints to be turned back up to an angle bf 45 O. To ensure that jointing compounds fulfil this requirement in countries where such handling techniques are used, an additional requirement concerning the turn back te
31、st has been included. Such jointing compounds are additionally designated with “Rp“. Page 4 EN 751 -2 : 1996 I Scope This European St,andard specifies requirements and test methods for non-hardening sealing materials (hereafter referred to as jointing compounds) suitable for sealing threaded metalli
32、c joints such as those specified in IS0 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) and hot water of heating systems (Class A), in gas
33、 appliances and their auxiliary equipment (Class B) as well as in LPG storage (Class C) according to table 1. Anaerobic jointing compounds are covered by EN 751 -1, non-hardening sealing materials in the form of PTFE-tapes are covered by EN 751-3. 2 Nonnative references This European Standard incorp
34、orates 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 dated references, subsequent amendments to or revisions of any of these publications apply to this Europ
35、ean Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 7-1 IS0 228-1 ENISO 2160 EN 437 EN 10242 prEN 10255 prEN 12164 Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensio
36、ns, tolerances and designation Pipe threads where pressure-tight joints are not made on the threads - Pari 1: Dimensions, tolerances and designation Petroleum products - Corrosiveness to copper - Copper strip test (IS0 2160:1985, including Corrigendum 1:1993) Test gases - Test pressures - Appliance
37、categories Threaded pipe fittings in malleable cast iron Carbon steel tubes suitable for welding or threading Copper and copper alloys - Rod for free machining purposes 3 Definitions For the purposes of this European Standard the following definitions apply: 3.1 non-hardening jointing compound (refe
38、rred to hereafter as jointing compound): Sealing material applied as liquid, gel, paste (normally without the addition of sealant supporting bases) or as tape of non-woven synthetic fibres impregnated with jointing compound to the threads. Page 5 EN 751 -2 : 1996 Temperature I Fluid I range Class 3.
39、2 sealant supporting bases: Materials (e.g. hemp, flax or synthetic fibres) which may be used in some countries to support jointing compound in large threaded joints and ensure that the jointing compound remains in its position on the male thread and is not stripped off during assembly of the joint.
40、 Pressure limit Typical application 3.3 gas family: For further information on types of gases see EN 437. A,ARp 3.4 batch: Any quantity of jointing compound manufactured in a single mix at one time. Ist, 2nd, 3rd 2) family gases hot water up to 130 -20 to 70 4 Classification of jointing compounds B
41、C There are three classes of jointing compounds defined by their properties and application range according to table 1. Jointing compounds may be suitable for one or more classes. The class(es) shall be indicated by the manufacturer. Ist, 2nd, 3rd 2, -20to 125 092 gas appliances family gases 3rd fam
42、ily gases -20 to 70 20 LPG storage Table 1: Classification of jointing compounds I I “C I bar I 1 installation 1 heating systems 1) Jointing compounds of Class A where limited turning back of taper/parallel (R/Rp) threaded joints is permitted, are additionally be marked with Rp. 2) Not including LPG
43、 in the liquid phase. 5 Requirements 5.1 Requirements to be met by the jointing compound as received 5.1 .i General The jointing compound shall be homogeneous and free of lumps when tested in accordance with 7.1 .I .l. The solids used in its manufacture shall be thoroughly ground. Tapes of non-woven
44、 synthetic fibres shall be evenly impregnated or coated with jointing compound paste, the mass per area of which when tested in accordance with 7.1.2 of which shall not be lower than 90 % of the value declared by the manufacturer. The jointing compound shall have good wetting properties necessary fo
45、r adhesion to metallic surfaces when tested in accordance with 7.2.1 .l. Page 6 EN 751 -2 : 1996 5.1.2 Corrosive properties The jointing compound shall not cause corrosion of aluminium, brass, copper, low carbon steel or zinc surfaces when tested in accordance with 7.1.2. The appearance of copper an
46、d brass test strips shall give a classification 3 or less in accordance with EN IS0 2160. 5.1.3 Storage properties The storage life of the jointing compound shall be at least two years in its original unopened container when stored at a temperature less than 25 “C, indicated and declared by the manu
47、facturer. 5.2 Requirements to be met by the jointing compound after assembly 5.2.1 Sealing properties 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
48、 in accordance with 7.2.1.2 to 7.2.1.7 in sequence. 5.2.1 .l Soundness When pressurized, within 1 h 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 Soundness after adjustment (additional requirement for Class ARp only) Afer adjus
49、ting the test assemblies in accordance with 7.2.1.3 the joints of these test assemblies shall not leak. when tested in accordance with 7.2.1.2. NOTE: This additional requirement is only valid for countries in which a limited turning back of prefabricated taper/parallel (RIRp) threaded joints is permitted. Jointing compounds fulfilling this requirement should additionally be marked with Rp. 5.2.1.3 Resistance to gas condensates The sealing properties of the jointing compound shall not be impaired by liquid hydrocarbon gas condensate when tested in accor
