An employer who is a user or owner of a pressure system shall ensure that -
(a) so far as is reasonably practicable, in regard to maintenance operations where there is a hazard from pressure, that they are carried out when the pressure system is depressurised and, where this is not practicable, appropriate protection measures are taken for the carrying out of such operations,
(b) where appropriate, a maintenance file for any pressure system is maintained and kept up to date, and
(c) where the need for repairs which are significant in relation to the system being able to safely withstand pressure becomes apparent, a competent person is consulted on the particulars of those repairs.