TB017 v2 Pressure testing in changing ambient conditions

This guidance outlines the safe method of pressure leak testing of RACHP pipework using oxygen free nitrogen (OFN) at high pressure; with particular emphasis on the change in pressure caused by changes to ambient temperatures during the leak test period.

It is a requirement of the F-Gas Regulation (EC517/2014 Art.3) that installers of RACHP systems, and the associated pipework and
components, “shall take precautionary measures to prevent leakage” of the refrigerants to be contained within the systems.

It is also a requirement that regular leak checks that have identified leakage “shall be repaired without undue delay” and the point of leak
be tested again “within one month”.

V2 UPDATE

REFCOM have been made aware of an interpretation of EN378:2 which suggests the use of tracer gas for every installation regardless of the complexity of the system or proportionality of risk of leakage being applied. After extensive discussion with other sectors of industry, REFCOM has updated TB017 with a version 2 to make clear to members that at all times an installation must follow the manufacturers’ installation instructions and guidance to comply with the Pressure Equipment Regulations and avoid any unnecessary over-specification of EN378.

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