CAN/ULC-S643-M90

1. SCOPe 1.1 These requirements cover single and double wall cylindrical horizontal steel tanks of the non-pressure type that are used for the aboveground storage of flammable and combustible liquids with a relative density not greater than 1.0, such as gasoline, fuel oil, or similar products. 1.2 Section 3 of these requirements cover single wall tanks. 1.3 Section 4 of these requirements cover double wall tanks. (Amendment No. 4 dated February 1998, revised Clause 1.1 and added Clauses 1.2 and 1.3) 1.4 These requirements cover tanks which are fabricated, inspected and tested for leakage before shipment from the factory as completely assembled vessels. 1.5 These requirements cover aboveground tanks provided with integral supports to allow for relocation as required by their intended service. These tanks are for installation at locations such as farms, construction sites, demolition sites, exploration sites, forestry operations and similar locations. 1.6 Tanks fabricated in accordance with this Standard are not intended for the transportation of fuel nor are they to be transported while containing fuel. 1.7 These requirements do not cover tanks of capacities greater than 5 000 L.