1. No user shall require or permit a vessel under pressure to be used unless it is provided with all the appurtenances as required by the health and safety standard used in the design, construction and manufacture of such a vessel under pressure: Provided that alternative appurtenances other than those required by the standard shall only be fitted with the written approval of the approved inspection authority.
2. In the absence of such a requirement in the health and safety standard used in the design, construction and manufacture of such a vessel under pressure, appurtenances shall be provided as required by the approved inspection authority and those appurtenances shall be so selected, arranged and installed as to be safe for the particular purpose for which the vessel under pressure is to be used.
3. Every user of a boiler or pressure vessel shall ensure that the boiler or pressure vessel in use is fitted with at least one pressure gauge and the maximum permissible operating pressure shall be clearly marked with a red line on the dial of the pressure gauge.
4. Every user of a boiler or pressure vessel shall ensure that the boiler or pressure vessel in use is fitted with at least one safety valve and such a safety valve shall be kept locked, sealed or otherwise rendered inaccessible to any unauthorized person: Provided that the number and capacity of the safety valve shall be to the requirements of the design standard for the boiler or pressure vessel as required under subregulation (2).