Design and constructionE+W+S
4.—(1) Any person who designs, manufactures, imports or supplies any pressure system or any article which is intended to be a component part of any pressure system shall ensure that paragraphs (2) to (5) are complied with.
(2) The pressure system 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 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 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.