CEN - EN 751-3
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
Organization: | CEN |
Publication Date: | 1 June 2022 |
Status: | active |
Page Count: | 26 |
ICS Code (Seals for pipe and hose assemblies): | 23.040.80 |
scope:
This document specifies requirements and test methods for unsintered polytetrafluorethyle
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.