Safe Working Practices Regulations (C.R.C., c. 1467)

81 (1) No person shall enter or remain in a boiler unless

• (a) a qualified person has ascertained that the boiler is isolated from every other steaming boiler; and

• (b) there is another person in attendance at a manhole opening of the boiler.

(2) The qualified person referred to in paragraph (1)(a) shall ensure that

• (a) locking devices are fitted to the boiler isolating valves;

• (b) a person is in attendance at the position where the boiler is isolated;

• (c) effective warning notices are placed at the position where the boiler is isolated; or

• (d) blank flanges are fitted between the boiler and every other steaming boiler.

(3) Every person who is in attendance at a manhole opening of a boiler shall, except where an emergency occurs with respect to the person inside the boiler, remain in attendance until the person inside leaves the boiler.

(4) No person shall enter the furnace side of any boiler that contains

• (a) hot water at a temperature in excess of 55°C; or

• (b) steam under pressure.