Design, construction, repair, and modification
4.—(1) Any person who designs, manufactures, imports, or supplies any pressure system or transportable gas container, or any article which is intended to be a component part of any pressure system or transportable gas container, shall ensure that paragraphs (2) to (5) are complied with.
(2) The pressure system, transportable gas container, or article, as the case may be, shall be properly designed and properly constructed from suitable material, so as to prevent danger.
(3) The pressure system, transportable gas container or article, as the case may be, shall be so designed and constructed that all necessary examinations for preventing danger can be carried out.
(4) Where the pressure system has any means of access to its interior, it shall be so designed and constructed as to ensure, so far as practicable, that access can be gained without danger.
(5) The pressure system and transportable gas container shall be provided with such protective devices as may be necessary for preventing danger; and any such device designed to release contents shall do so safely, so far as is practicable.
(6) The employer of a person who modifies or repairs a pressure system or transportable gas container at work shall ensure that nothing about the way in which it is modified or repaired gives rise to danger or otherwise impairs the operation of any protective device or inspection facility.