Definitions
1. In this Regulation, “air receiver” means a pressure vessel that contains, distributes or otherwise handles air under pressure; “Canadian Registration Number” means the registration number given under section 10 to a boiler or pressure vessel; “compressed-air plant” means a plant in which pressure vessels contain, distribute or otherwise handle air under a pressure of more than fifteen pounds; “compressed-gas plant” means a plant in which pressure vessels may be used for compressed gas but does not include a refrigeration plant; “cushion tank” means a pressure vessel designed for installation in a closed hot water heating system to provide an air cushion for the expansion of water; “direct expansion coils” means the piping in which liquid refrigerant is vaporized to produce ice in a rink for hockey, skating or curling; “head” means, (a) when used in respect of a fire-tube boiler, the plate into which the ends of the tubes are fitted, (b) when used in respect of a water-tube boiler, the plate closing the ends of the drum, and (c) when used in respect of a pressure vessel, the plate closing the part in which the gas, vapour or liquid is under pressure; “heat exchanger” means a pressure vessel under pressure of more than fifteen pounds used exclusively for transferring heat from one substance to another; “hot water storage tank” means a pressure vessel used for the storage of hot water; “locomotive boiler” means a high pressure boiler that may be used to furnish motivating power for travelling on rails; “miniature boiler” means a boiler having a shell, (a) with an inside diameter not greater than sixteen inches, (b) with an over-all length not greater than forty-two inches measured from outside to outside of the heads at their centres, (c) with a water-heating surface not more than twenty square feet, and (d) with a maximum working pressure not greater than one hundred pounds; “oil-refining plant” means a plant in which the pressure vessels may be used for separating, evaporating, cracking, desalting, purifying or refining oil or any of its constituents; “power boiler” means any high pressure boiler other than a locomotive boiler or a miniature boiler; “power rating” means, (a) when used in respect of a compressed-air plant or compressed-gas plant, the total horse-power of the machinery-units driving the compressors, (b) when used in respect of an electric boiler in a steam plant, the quotient obtained by dividing the total maximum capacity of the heating elements in kilowatts by ten, or (c) when used in respect of a boiler in a steam plant, other than an electric boiler, the quotient obtained by dividing the total heating surface of the boiler in square feet by ten; “pressure piping” means piping in which a pressure of more than fifteen pounds is exerted internally; “refrigerant vessel” means a pressure vessel that is a component part of a refrigeration system; “steam plant” means a plant in which the boilers may be used for generating or utilizing steam and includes any pipe, fitting or other equipment that is attached to the boilers and constitutes one unit with them. R.R.O. 1990, Reg. 59, s. 1. Classification of Boilers, Plants and Refrigerants