EN 1254-4:2021

This document specifies product characteristics, assessment methods, compliance criteria of the test results and a designation system for threaded fittings. These threaded ends exist with metallic and with non-metallic sealing elements for the purposes of joining with tubes, pipes, fittings or valves, the threaded ends have a size range from 3,175 mm (1/8") to 101,6 mm (4"). The threaded fittings are designed for a service lifetime up to fifty years.The fittings are used up to the operating temperatures and corresponding maximum operating pressures as indicated in Annex A.This document applies to copper alloy fittings. A non-exhaustive list of these copper alloys is given in CEN/TS 13388.Threaded fittings may also have flanged end connections according to EN 1092-3.Threaded fittings may also have a plated or other decorative surface coating.Fittings can be produced by machining, metal forming, casting, or fabrication.Products covered by this document are intended to be used in:a) liquid applications:- hot, cold or combined hot and cold water, includingsystems according to EN 806;- closed heating systems according to EN 12828;- cooling systems;- drainage systems;- fire protection systems including sprinkler systems according to EN 12845.b) gas applications:- natural gas and liquefied petroleum gas systems with a maximum operating pressure less than or equal to 5 bar according to EN 1775;- compressed air systems.