OHS Code

Published Date: July 01, 2009
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Part 15 Managing the Control of Hazardous Energy

Section 215.4 Isolating piping

(1) To isolate piping or a pipeline containing harmful substances under pressure, an employer may use

(a) a system of blanking or blinding, or

(b) a double block and bleed isolation system providing

(i) 2 blocking seals on either side of the isolation point, and

(ii) an operable bleed-off between the two seals.

(2) An employer must ensure that piping that is blanked or blinded is clearly marked to indicate that a blank or blind is installed.

(3) An employer must ensure that, if valves or similar blocking seals with a bleed-off valve between them are used to isolate piping, the bleed-off valve is secured in the “OPEN” position and the valves or similar blocking seals in the flow lines are functional and secured in the “CLOSED” position.

(4) An employer must ensure that the device used to secure the valves or seals described in subsection (3) is

(a) a positive mechanical means of keeping the valves or seals in the required position, and

(b) is strong enough and designed to withstand inadvertent opening without the use of excessive force, unusual measures, or destructive techniques.

(5) If it is not reasonably practicable to provide blanking, blinding or double block and bleed isolation, an employer must ensure that an alternate means of isolation that provides adequate protection to workers, certified as appropriate and safe by a professional engineer, is implemented.