# The Pressure Systems and Transportable Gas Containers Regulations 1989, Paragraph 4


That part of a system which is only a pressure system because it is–
(a) subject to a leak test (except that this sub-paragraph shall not apply to a pipeline);
(b) pressurised unintentionally, such pressurisation being not reasonably foreseeable; or
(c) a pipeline pressurised by a relevant fluid solely as part of a test or line clearance operation, but this exception shall not apply if the pipeline–
(i) is used for the conveyance of a relevant fluid, or
(ii) is pressurised beyond its safe operating limits.

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Source: https://www.legislation.gov.uk/uksi/1989/2169/schedule/2/part/I/paragraph/4 (the official version)
Page: https://openlegislation.uk/pressure-systems-and-transportable-gas-containers-regulations-1989/schedule-2/part-I/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.