BS EN 751-3:2022+A1:2023:2024 Edition

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Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water – Unsintered PTFE tapes and PTFE strings

Published By	Publication Date	Number of Pages
BSI	2024	26

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Categories: 23.040.80 - Seals for pipe and hose assemblies, BSI

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Description

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.

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PDF Pages	PDF Title
2	undefined
9	1 Scope 2 Normative references
10	3 Terms and definitions 4 Differentiation and classification of PTFE tapes and PTFE strings
11	5 Requirements 5.1.2.1 Length 5.1.2.2 Width 5.1.2.3 Thickness 5.1.3.1 Mass per area for PTFE tapes 5.1.3.2 Mass per length for PTFE strings
12	5.2.1.1 General 5.2.1.2 Tightness 5.2.1.3 Resistance to temperature cycling
13	6 Test samples and documentation 7 Test methods 7.2.2.1 Length 7.2.2.2 Width
14	7.2.2.3 Thickness 7.2.3.1 Measurement of mass per area for PTFE tapes 7.2.3.2 Measurement of mass per length for PTFE strings 7.2.4.1 Analytical method
15	7.2.4.2 Thermogravimetric method 7.2.6.1 PTFE tapes class F
16	7.2.6.2 PTFE tapes class G
17	7.2.6.3 PTFE strings class F
18	7.2.6.4 PTFE string class G 7.3.1.1 Preparation of test assemblies
20	7.3.1.2 Tightness test
21	7.3.1.3 Temperature cycling test
22	8 Marking and instructions
23	Annex ZA (informative)Relationship between this European Standard and the essential requirements of Regulation (EU) 2016/426 aimed to be covered

Additional information

Status	Definitive
Title	Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water – Unsintered PTFE tapes and PTFE strings
Replaces	BS EN 751-3:1997
Publisher	BSI
Committee	PRI/70
Pages	26
Publication Date	2024-01-19
ISBN	978 0 539 29954 0
Standard Number	BS EN 751-3:2022+A1:2023
Identical National Standard Of	EN 751-3:2022 + A1
Descriptors	Dimensional tolerances, Classification systems, Polytetrafluoroethylene, Tape, Width, Thermal-cycling tests, Gas pipes, Metals, Instructions for use, Hot-water supply systems, Weight tolerances, Vibration testing, Water, Thermal testing, Test equipment, Test specimens, Dimensional measurement, 2nd family gases, Pressure, 3rd family gases, Determination of content, Sealing materials, Environment (working), Screwed fittings, Pipe fittings, Marking, Temperature, Wrapping tests, Pressure testing, Dimensions, Gas-powered devices, Leak tests, Lubricants, Performance testing, 1st family gases, Pipe couplings, Testing conditions
Amends	BS EN 751-3:2022
ICS Codes	23.040.80 - Seals for pipe and hose assemblies

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BS EN 751-3:2022+A1:2023:2024 Edition

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