SIST EN 751-3:2022
(Main)Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes and PTFE strings
Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes and PTFE strings
This document specifies requirements and test methods for unsintered polytetrafluorethylene (PTFE) tapes and polytetrafluorethylene (PTFE) strings (PTFE tapes or PTFE strings, for short) which are suitable for sealing threaded metallic joints as specified in EN 10226-1:2004.
This document covers two classes of PTFE tapes and PTFE strings suitable for fine (F) and coarse (G) threads.
The PTFE tapes and PTFE strings are used as sealing materials for metallic threaded joints in contact with 1st family gases (town gas), 2nd family gases (natural gas) and 3rd family gases (liquefied petroleum gases (LPG)) up to 500 kPa, up to 700 kPa for hot water of heating systems, and up to 20 kPa in gas appliances and their auxiliary equipment. The maximum working pressure covered in this document is 2000 kPa which is relevant to LPG storage. The temperature range is limited to −20 °C to 125 °C.
Dichtmittel für metallene Gewindeverbindungen in Kontakt mit Gasen der 1., 2. und 3. Familie und Heißwasser - Teil 3: Ungesinterte PTFE-Bänder und -Fäden
Dieses Dokument legt Anforderungen und Prüfverfahren für ungesinterte Polytetrafluorethylen-(PTFE)-Bänder und Polytetrafluorethylen-(PTFE)-Fäden (im weiteren als PTFE-Bänder oder PTFE-Fäden bezeichnet) fest, die geeignet sind metallene Gewindeverbindungen abzudichten, wie sie in EN 10226-1:2004 festgelegt sind.
Dieses Dokument behandelt zwei Klassen von PTFE-Bändern und PTFE-Fäden, die für feine (F) und grobe (G) Gewinde geeignet sind.
Die PTFE-Bänder und PTFE-Fäden werden als Dichtmittel für metallene Gewindeverbindungen verwendet, die für den Einsatz in Installationen bis zu einem Druck von 500 kPa bei Gasen der 1. Familie (Stadtgas), der 2. Familie (Erdgas) und der 3. Familie (Flüssiggas) und bis zu einem Druck von 700 kPa bei Heißwasser von Heizungsanlagen vorgesehen sind, außerdem für den Einsatz in Gasgeräten und deren Zusatzeinrichtungen bis zu einem Druck von 20 kPa. Der maximale durch dieses Dokument abgedeckte Betriebsdruck von 2000 kPa betrifft die Flüssiggaslagerung. Der Temperaturbereich ist begrenzt auf-20 °C bis 125 °C.
Matériaux d'étanchéité pour raccords filetés en contact des gaz du 1ère, 2ème et 3ème groupe et de l'eau chaude - Partie 3 : Bandes et cordons en PTFE non fritté
Le présent document prescrit les exigences et les méthodes d'essai auxquelles les bandes en polytétrafluoroéthylène (PTFE) et cordons en polytétrafluoroéthylène (PTFE) non frittés (appelées dans le reste du document bandes PTFE ou cordons PTFE) doivent satisfaire pour étanchéiser les raccords filetés métalliques conformes à l'EN 10226-1 :2004.
Le présent document couvre les deux classes de bandes et cordons en PTFE adaptées aux filetages à pas fins (F) et aux filetages à pas gros (G).
Les bandes et cordons en PTFE sont utilisés sur les installations de gaz de la 1ère famille (gaz de ville), de la 2ème famille (gaz naturel) et de la 3ème famille (gaz de pétrole liquéfiés (GPL)) jusqu'à 500 kPa et jusqu'à 700 kPa pour l'eau chaude des systèmes de chauffage, et jusqu'à 20 kPa pour les appareils à gaz et leur équipement auxiliaire. La pression maximale de fonctionnement couverte par le présent document est de 2000 kPa pour ce qui concerne le stockage du GPL. La plage de température est comprise entre −20 °C & 125 °C.
Tesnilni materiali za kovinske navojne zveze v stiku s plini 1., 2. in 3. družine ter vročo vodo - 3. del: Nesintrani PTFE trakovi in vrvice
Ta dokument določa zahteve in preskusne metode za nesintrane trakove in vrvice iz politetrafluoroetilena (na kratko: PTFE trakovi oz. vrvice), ki so primerni za tesnjenje kovinskih navojnih zvez, kot je določeno v standardu EN 10226-1:2004. Ta dokument zajema dva razreda PTFE trakov in vrvic, primerna za drobne (F) in grobe (G) navoje. PTFE trakovi in vrvice se uporabljajo kot tesnilni materiali za kovinske navojne zveze, ki so v stiku s plini iz 1. in 2. skupine (mestni plin), plini iz 2. skupine (zemeljski plin) ter plini iz 3. skupine (utekočinjeni naftni plin (LPG)) do največ 500 kPa, do 700 kPa za vročo vodo ogrevalnih sistemov ter do 20 kPa v plinskih napravah in njihovi dodatni opremi. Največji delovni tlak, obravnavan v tem dokumentu, je 2000 kPa, kar je relevantno za hranjenje utekočinjenega naftnega plina (LPG). Temperaturno območje je omejeno na −20 °C do 125 °C.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2022
Nadomešča:
SIST EN 751-3:1997
SIST EN 751-3:1997/AC:1999
Tesnilni materiali za kovinske navojne zveze v stiku s plini 1., 2. in 3. družine ter
vročo vodo - 3. del: Nesintrani PTFE trakovi in vrvice
Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family
gases and hot water - Part 3: Unsintered PTFE tapes and PTFE strings
Dichtmittel für metallene Gewindeverbindungen in Kontakt mit Gasen der 1., 2. und 3.
Familie und Heißwasser - Teil 3: Ungesinterte PTFE-Bänder und -Fäden
Matériaux d'étanchéité pour raccords filetés en contact des gaz du 1ère, 2ème et 3ème
groupe et de l'eau chaude - Partie 3 : Bandes et cordons en PTFE non fritté
Ta slovenski standard je istoveten z: EN 751-3:2022
ICS:
23.040.80 Tesnila za cevne zveze Seals for pipe and hose
assemblies
83.140.50 Tesnila Seals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 751-3
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 23.040.80 Supersedes EN 751-3:1996
English Version
Sealing materials for metallic threaded joints in contact
with 1st, 2nd and 3rd family gases and hot water - Part 3:
Unsintered PTFE tapes and PTFE strings
Matériaux d'étanchéité pour raccords filetés en contact Dichtmittel für metallene Gewindeverbindungen in
des gaz de la 1ère, 2ème et 3ème famille et de l'eau Kontakt mit Gasen der 1., 2. und 3. Familie und
chaude - Partie 3 : Bandes et cordons en PTFE non Heißwasser - Teil 3: Ungesinterte PTFE-Bänder und -
fritté Fäden
This European Standard was approved by CEN on 27 April 2022.
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 references
concerning such national standards may be obtained on application to the CEN-CENELEC 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 its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 751-3:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Differentiation and classification of PTFE tapes and PTFE strings . 7
4.1 Differentiation . 7
4.2 Classification . 7
5 Requirements . 8
5.1 Requirements to be met by the PTFE tape and PTFE strings as received . 8
5.1.1 General . 8
5.1.2 Tape and string dimensions . 8
5.1.3 Mass . 8
5.1.4 Residual lubricant content . 9
5.1.5 PTFE structure and material . 9
5.1.6 Wrapping properties . 9
5.2 Requirements to be met by the PTFE tape and PTFE string after assembly . 9
5.2.1 Sealing properties . 9
5.2.2 Dismantling . 9
6 Test samples and documentation . 10
6.1 Test samples . 10
6.2 Test documentation . 10
7 Test methods . 10
7.1 General . 10
7.2 Test methods for PTFE tapes or PTFE strings as received . 10
7.2.1 Test of general requirements . 10
7.2.2 Measurement of dimensions . 10
7.2.3 Measurement of mass . 11
7.2.4 Determination of residual lubricant content . 11
7.2.5 Test of PTFE structure . 12
7.2.6 Test of wrapping properties . 12
7.3 Test of PTFE tapes or PTFE strings after assembly . 15
7.3.1 Test of sealing properties . 15
7.3.2 Test of dismantling . 19
8 Marking and instructions . 19
8.1 Marking on packages . 19
8.2 Instructions . 19
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2016/426 aimed to be covered . 20
Bibliography . 21
European foreword
This document (EN 751-3:2022) has been prepared by Technical Committee CEN/TC 208 “Elastomeric
seals for joints in pipework and pipelines”, the secretariat of which is held by BSI.
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 December 2022, and conflicting national standards shall
be withdrawn at the latest by December 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 751-3:1996.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
The following main technical changes have been made compared to EN 751-3:1996:
a) normative references have been updated;
b) definitions have been added;
c) requirements and tests for strings have been added;
d) differentiation between PTFE tapes and PTFE strings has been added;
e) restriction of use of APFO and PFOA has been added;
f) requirements and testing of mass per area and mass per length have been specified and added;
g) requirements and testing for the PTFE structure and material have been added;
h) wrapping properties have been specified;
i) possibility of adjustment has been deleted;
j) for the determination of residual lubricant content, a thermogravimetric method has been added;
k) for the determination of residual lubricant content, the quantities and associated vessel volumes
were reduced in the analytical method;
l) for the determination of structure and material, DSC method has been added;
m) testing of wrapping properties has been added and specified;
n) requirements for the test samples and their assembly have been added and specified;
o) evaluation of failed samples after assembly has been added;
p) temperature cycling test has been revised and specified;
q) vibration test has been deleted;
r) marking has been clarified;
s) Annex ZA has been added.
The EN 751 series comprises the listed parts:
— Part 1: Anaerobic jointing compounds;
— Part 2: Non-hardening jointing compounds;
— Part 3: Unsintered PTFE tapes and strings.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
This document specifies requirements and test methods for tapes and strings produced from virgin
unsintered polytetrafluorethylene (PTFE) for use with metallic threaded joints. It specifies two classes of
PTFE tapes and PTFE strings – mainly differing in thickness and mass per area – for fine (F) and coarse
(G) threads.
A universally applicable PTFE tape or PTFE string may be used for all gas, potable water and hot water
installation.
In respect of potential adverse effects of the jointing compounds covered by this document on the quality
of water intended for human consumption this document 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 and characteristics of the jointing compounds should comply with current regulations, where they
exist, depending the acceptance of verifiable European criteria.
Compared to previous standard EN 751-3:1996, this document does not include an assessment of the
turning back properties. It has been determined in practice and during periodic tests that these
properties can only be reproduced to a limited extent. Turning back during installation should be avoided.
Should a connection made with PTFE tapes or threads nevertheless (have to) be turned back during
installation, this is the responsibility of the user. It is common sense that installations are checked for
tightness after completion.
Although PTFE natural colour is white and most common for PTFE tapes and PTFE strings, other colours
may be used as well.
Test practice since the standard was published has shown that the vibration test has not provided any
additional information about the tightness of the threaded connections. Therefore, the test was removed
from the test schedule of the standard.
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