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Selecting Copper Tube and Fittings (GN25)
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Selecting Copper Tube and Fittings (GN25)
This guidance note is an updated version of GN25 which provides guidance on selecting copper tube and fittings following revisions to BS EN14276-1:2020, BS EN14276-2:2020 and BS EN12735-1:2020.
The pressure ratings have been updated to include copper tube sizes now in current use. This document only refers to the use of refrigeration copper tube with brazed connections supplied in straight lengths in the half hard or fully hard condition. There is a small increase in the pressure ratings from the previous version of GN25 due to the change from the formulae previously used.
(amended 2022 with minor correction to formula shown - does not change calculations in table)
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