Section 30, The Machinery (Safe Working Citation

(1) Every boiler with a capacity of two hundred and fiftygallons or over shall be provided with two reliable feeding apparatuses, each of which is capable of amply supplying the boiler with water. One such feeding apparatus shall be either a power pump or an injector. Two or more boilers combined for permanent joint working shall, for the purposes of this rule, be regarded as one boiler. Each such feeding apparatus shall be entirely independent of the other. (2) One such feeding apparatus shall be sufficient for boilers of less than two hundred and fifty gallons capacity. {3) At the place where the delivery pipe enters the boiler, the same shall be provided with a self-acting non-return valve (check) and a stop-cock or wheel-valve, the latter to be placed between the check and the boiler.