CSA Group CSA B64 Series:26 National Standard of Canada Backflow preventers and vacuum breakers

Preface

This is the eighth edition of the CSA B64 Series, Backflow preventers and vacuum breakers. It supersedes the previous editions, published in 2021, 2011, 2007, 2001, 1994, 1988, and 1976.

This edition consists of the following Standards:

• CSA B64.0, Definitions, general requirements, and test methods for vacuum breakers and backflow preventers;
• CSA B64.1.1, Atmospheric vacuum breakers (AVB);
• CSA B64.1.2, Pressure vacuum breakers (PVB);
• CSA B64.1.3, Spill-resistant pressure vacuum breakers (SRPVB);
• CSA B64.1.4, Vacuum breaker, air space type (ASVB);
• CSA B64.2, Hose connection vacuum breakers (HCVB);
• CSA B64.2.1, Hose connection vacuum breakers (HCVB) with manual draining feature;
• CSA B64.2.1.1, Hose connection dual check vacuum breakers (HCDVB);
• CSA B64.2.2, Hose connection vacuum breakers (HCVB) with automatic draining feature;
• CSA B64.3, Dual check valve backflow preventers with atmospheric port (DCAP);
• CSA B64.3.1, Dual check valve backflow preventers with atmospheric port for carbonators (DCAPC);
• CSA B64.5, Double check valve (DCVA) backflow preventers;
• CSA B64.6, Dual check valve (DuC) backflow preventers;
• CSA B64.6.1, Dual check valve backflow preventers for fire protection systems (DuCF);
• CSA B64.7, Laboratory faucet vacuum breakers (LFVB);
• CSA B64.8, Dual check valve backflow preventers with intermediate vent (DuCV); and
• CSA B64.9, Single check valve backflow preventers for fire protection systems (SCVAF).

The following are the major changes to this edition:

• Removal of CSA B64.4, Reduced pressure principle (RP) backflow preventers;
• removal of CSA B64.4.1, Reduced pressure principle backflow preventers for fire protection systems (RPF);
• removal of CSA B64.5.1, Double check valve backflow preventers for fire protection systems (DCVAF);
• clarification of back siphonage test in CSA B64.6; and
• addition of the CSA B64.5.1 and CSA B64.5 requirements referenced in CSA B64.9 directly into CSA B64.9.

These Standards are considered suitable for use for conformity assessment within the stated scopes of the Standards.

These Standards was prepared by the Technical Committee on Backflow Preventers and Water Pressure Reducing Valves, under the jurisdiction of the Strategic Steering Committee on Construction and Civil Infrastructure, and has been formally approved by the Technical Committee.

These Standards have been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. They have been published as National Standards of Canada by CSA Group.

Notes:

1) Use of the singular does not exclude the plural (and vice versa) when the sense allows.

2) Although the intended primary application of these Standards are stated in their Scope, it is important to note that it remains the responsibility of the users of these Standards to judge its suitability for their particular purpose

Scope

1.1 Scope of the CSA B64 Series The CSA B64 Series covers vacuum breakers and backflow preventers that are used in potable water supply systems to prevent cross-connections.

1.2 Scope of this Standard This Standard specifies definitions, general requirements, test methods, markings, and instructions that are common to some or all of the Standards in the CSA B64 Series.

1.3 Intent of this Standard This Standard is not a complete Standard in itself and is intended to be used in conjunction with one of the Standards in the CSA B64 Series to form a complete Standard for a particular type of vacuum breaker or backflow preventer.

1.4 Terminology In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

1.5 Units of measurement This Standard is written in SI units, which are the units of record for the purposes of this Standard.

For conversion tables, see Annex A. Vacuum is expressed in pressure below ambient. All pipe sizes are shown as nominal pipe sizes (NPS).