Canada Occupational Health and Safety Regulations

10.24 Every assembly of pipes, pipe fittings, valves, safety devices, pumps, compressors and other fixed equipment that is used for transferring a hazardous substance from one location to another shall be

• (a) labelled to identify the hazardous substance transferred therein and, where appropriate, the direction of the flow; and

• (b) fitted with valves and other control and safety devices to ensure its safe operation, maintenance and repair.