168. Double-wall piping must consist of piping that meets the requirements of section 8.25 or 8.26 of Chapter VIII of the Construction Code (chapter B-1.1, r. 2) or section 167 of this Chapter installed inside other piping that meets the requirements of section 8.25 or 8.26 of Chapter VIII of the Construction Code or the requirements of section 167 of this Chapter, or the requirements of ULC/ORD Standard C107.19 Secondary Containment of Underground Piping for Flammable and Combustible Liquids, published by Underwriters’ Laboratories of Canada.
On a Class A site, double-wall piping must have an automatic leak detection system with a visual and audible alarm that meets the requirements of ULC/ORD Standard C107.12-1992 Line Leak Detection Devices for Flammable Liquid Piping or ULC/ORD Standard C58.14-1992 Non-Volumetric Leak Detection Devices for Underground Flammable Liquid Storage Tanks, published by Underwriters’ Laboratories of Canada.
Despite the foregoing, vent piping need not be double-wall piping.
For the purposes of the second paragraph, the following places are Class A sites:
(1) a site within 1,000 m measured horizontally from a well used to collect drinking water for a residence that cannot be connected to a waterworks system, from the intake of a pipe used to supply a municipality with drinking water, from a channel used exclusively to supply a municipality with drinking water or from a well whose water is used in the making of a food product; and
(2) a site within 50 m measured horizontally from a station, a tunnel or other underground structure necessary for the operation of a subway, a public building with one or more storeys situated below the ground floor or the first storey, as defined in the Public Buildings Safety Act (chapter S-3) or in its regulation, from an underground or semi-underground parking garage that may accommodate at least 6 vehicles and that requires mechanical ventilation in accordance with section 126.96.36.199 of Chapter I of the Construction Code.