Section 32, The Machinery (Safe Working Citation

(1) Every boiler shall be provided with at least tworeliable safety-valves which shall be loaded so that they will lift when the authorised working gauge pressure is reached. The area of opening for discharge of steam of these valves shall be sufficient to prevent accumulatien of steam pressure in Machinery (Safe Working & Inspection) [Cap. 21 e:x:cess of ten per cent. above that for which the valves are set if any one of the safety-valves fails to operate. (2) Safety-valves shall be attached directly to the shell of the boiler or steam dome: no stop-valve shall be allowed to intervene. (3) One of these safety-valves shall be locked and only accessible to the person in charge of the boiler. This lock-up valve shall have an area of not less, and a load not greater, than those which are not locked up. · (4) If two or more boilers have a steam drum in common from which they cannot be disconnected, two safety-valves are sufficient, provided that each is of the required area. (5) A suitable safety-valve, separate from any stop valve, shall be sufficient for boilers of less than two hundred and fifty gallons capacity, for super-heaters that can be shut off from boilers and for economisers and for such apparatus using steam of a higher pressure than that of the atmosphere for cooking and heating purposes. This safety-valve shall be locked up or sealed and only accessible to the person in charge of the boiler. This safety-valve shall be so adjusted as to prevent the boiler, super-heater, economiser or other apparatus using steam of a higher pressure than that of the atmosphere for cooking and heating purposes, being worked at a pressure greater than the maximum perniissible working pressure and shall be fixed directly to, or as close as practicable to, the boiler, super-heater, economiser or other apparatus using steam at a higher pressure than that of the atmosphere for cooking and heating purposes.