ULC CAN/ULC-S656:2024 OIL-WATER SEPARATORS

PREFACE

This is the Second Edition of the Standard for Oil-Water Separators, CAN/ULC-S656.

This Edition of the Standard has been formally approved by the ULC Standards Committee on Oil-Water Separators.

This Standard has been developed in compliance with the requirements of Standards Council of Canada (SCC) for accreditation of a Standards Development Organization.

Only metric SI units of measurement are used in this Standard. If a value for measurement is followed by a value in other units in parentheses, the second value may be approximate. The first stated value is the requirement.

Appendix A, identified as Normative, forms a mandatory part of this Standard.

Appendix B, identified as Informative, is for guidance and information purposes only.

In Canada, there are two official languages, English and French. All safety warnings must be in French and English. Attention is drawn to the possibility that some Canadian authorities may require additional markings and/or installation instructions to be in both official languages.

This Second Edition National Standard of Canada is based on, and now supersedes, the First Edition.

Attention is drawn to the possibility that some of the elements of this Canadian standard may be the subject of patent rights. ULC Standards shall not be held responsible for identifying any or all such patent rights.

Requests for interpretation of this Standard should be sent to ULC Standards. The requests should be worded in such a manner as to permit a “yes” or “no” answer based on the literal text of the requirement concerned.

This CAN/ULC-S656 Standard is under continuous maintenance, whereby each revision is approved in compliance with the requirements of SCC for accreditation of a Standards Development Organization. In the event that no revisions are issued for a period of four years from the date of publication, action to revise, reaffirm, or withdraw the standard shall be initiated.

Comments or proposals for revisions on any part of the Standard may be submitted at any time. Proposals should be submitted via a Proposal Request in the Collaborative Standards Development System (CSDS) at https://csds.ul.com.

This Standard is intended to be used for conformity assessment.

1 SCOPE

1.1 This Standard provides minimum requirements for shop fabricated single-wall or double-wall oil[1]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.

NOTE: Includes separators intended to collect and separate rainwater or wastewater containing free oil. i

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.

1.5 Except for optional Climate Change Adaptation requirements in Appendix B, which includes optional construction and/or performance requirements, and associated ratings intended to address more severe conditions associated with the effects of Climate Change, these requirements do not cover special evaluations for resistance to, or use after, earthquakes, floods, high wind events, or other natural disasters.

NOTE 1: See the Note at the beginning of Appendix B for further information on the terms “Adaptation” and “Mitigation”, as they pertain to Climate Change.

1.6 These requirements do not cover grease interceptors. Refer to the CSA B481 series of standards for grease interceptors which are utilized in sanitary drainage systems for the interception of non-soluble organic fats, oils, and greases from animal or vegetable sources.