OHS Code

Published Date: July 01, 2009
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Part 10 Fire and Explosion Hazards

Section 169 Hot work

(1) Despite any other section in this Part, an employer must ensure that hot work is done in accordance with subsections (2) and (3) if

(a) the work area is a hazardous location, or

(b) the work area is not normally a hazardous location but an explosive atmosphere may exist for a limited time because

(i) a flammable substance is or may be in the atmosphere of the work area,

(ii) a flammable substance is or may be stored, handled, processed or used in the location,

(iii) hot work is on or in an installation or item of equipment that contains a flammable substance or its residue, or

(iv) the hot work is on a vessel that contains residue that may release a flammable gas or vapour when exposed to heat.

(2) An employer must ensure that hot work is not begun until

(a) a hot work permit is issued that indicates

(i) the nature of the hazard,

(ii) the type and frequency of atmospheric testing required,

(iii) the safe work procedures and precautionary measures to be taken, and

(iv) the protective equipment required,

(b) the hot work location is

(i) cleared of combustible materials, or

(ii) is suitably isolated from combustible materials,

(c) procedures are implemented to ensure continuous safe performance of the hot work, and

(d) testing shows that the atmosphere does not contain

(i) a flammable substance, in a mixture with air, in an amount exceeding 20 percent of that substance’s lower explosive limit for gas or vapours, or

(ii) the minimum ignitable concentration for dust.

(3) An employer must ensure that the tests referred to in subsection (2)(d) are repeated at regular intervals appropriate to the hazard associated with the work being performed.