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CAN/ULC-S656:2024
Standard for Oil-Water Separators
1.1 This Standard provides minimum requirements for shop fabricated single-wall or double-wall oil-water
separators intended to collect and separate free oil from water by gravity separation at an inlet free oil
concentration not exceeding 2 000 mg/L.
1.2 These oil-water separators are also installed for the capture and retention of oil spills under dry
weather conditions up to the free oil retention capacity of the oil-water separator.
1.3 These oil-water separators are intended for installation and operation in accordance with, but not
limited to, the following:
A Manufacturer’s instructions;
B CCME PN 1326, Environmental Code of Practice for Aboveground and Underground Storage
Tank Systems Containing Petroleum and Allied Petroleum Products;
C CPPI Code of Practice for Management of Water Effluent Quality at Petroleum Storage and
Distribution Facilities; and
D Regulations of the authority having jurisdiction.
NOTE 1: Collection and disposal of the effluent, free oil, and separated solids from oil-water separators is beyond the
scope of this document. Consult the authority having jurisdiction for disposal requirements for these substances.
NOTE 2: The accumulated solids are to be removed as recommended in the Manufacturer’s Operation and
Maintenance Instructions to ensure no adverse effect on the performance of the oil-water separator.
1.4 The requirements of this Standard apply to all oil-water separators. Users are advised that the
requirements of AHJs may impose additional performance and testing criteria beyond those described in
this document.