http://www.legislation.gov.uk/apni/1965/20/section/40Factories Act (Northern Ireland) 1965An Act to consolidate the Factories Acts (Northern Ireland) 1938 to 1959, and certain other enactments relating to the safety, health and welfare of employed persons.texttext/xmlenStatute Law Database2022-09-21Expert Participation2022-04-01 PART II401Every gasholder shall be of sound construction and shall be properly maintained.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3In the case of a gasholder of which any lift has been in use for more than twenty years, the internal state of the sheeting shall, at least once in every period of ten years, be examined by a competent person by cutting samples from the crown and sides of the holder or by other sufficient means, and all samples so cut and a report on every such examination signed by the person making it shall be kept available for inspection.4A record signed by the occupier of the factory or by a responsible official authorised in that behalf showing the date of the construction, as nearly as it can be ascertained, of the oldest lift of every gasholder in the factory shall be kept available for inspection.5Where there is more than one gasholder in the factory, every gasholder shall be marked in a conspicuous position with a distinguishing number or letter.6A gasholder shall not be repaired or demolished except under the direct supervision of a person who, by his training and experience and his knowledge of the necessary precautions against risks of explosion and of persons being overcome by gas, is competent to supervise such work.7In this section “gasholder” means a water-sealed gasholder which has a storage capacity of not less than 140 cubic metres.SR 1984/283S. 40(2) repealed (1.6.2015) by The Health and Safety (Miscellaneous Repeals, Revocations and Amendments) Regulations (Northern Ireland) 2015 (S.R. 2015/223), reg. 1(1), Sch. Table 1