CSA Group CSA B64.10:23/CSA B64.10.1:23 National Standard of Canada Selection and installation of backflow preventers/Maintenance and field testing of backflow preventers

Preface

This volume contains the eighth edition of CSA B64.10, Selection and installation of backflow preventers, and the fifth edition of CSA B64.10.1, Maintenance and field testing of backflow preventers. CSA B64.10 supersedes the previous editions published in 2017, 2011, 2007, 2001, 1994, 1988 (as part of the CAN/CSA-B64 Series), and 1981. CSA B64.10.1 supersedes the previous editions published in 2017, 2011, 2007, and 2001.

This edition includes the following major changes:

a) for CSA B64.10:

i) revision to the use of AVB, HCVB, DCAP, LFVB, DuCV, and ASVB devices;

ii) addition of Clause 5.3.3 for area protection and updates to Table 2;

iii) addition of Clause 5.4.2 for buildings classified as moderate hazards;

iv) addition of Clause 5.4.3 for single tenancy with multiple functions;

v) addition of Clause 5.4.4 for individual protection;

vi) updates to Clause 5.10 for heat exchangers;

vii) addition of Clause 5.11 for chemical dispensing systems;

viii) clarification of field testing at installation in Clause 6.1.5;

ix) updates to test cock requirements in Clause 6.4.3;

x) updates to the guides for degree of hazard for point of use cross-connections and premises in

Tables B.1 and B.2;

xi) updates to the authorized functions list in Annex E; and

xii) addition of a note on chemical breakdown to the Hodge and Sterner scale table in Annex G; and

b) for CSA B64.10.1:

i) clarification on field testing requirements in Clause 4.1.1; and

ii) addition of pressure drop across check valve 2 procedure for RP devices.

These Standards are intended as a guide for designers of potable water supply and plumbing systems in the selection of the proper type of device, for installers and owners in the installation and maintenance of the devices, and for inspection authorities in the testing of the devices after they have been installed. The Standards provide information on other methods of preventing contamination of potable water by backflow from back siphonage or back pressure.

These Standards provide selection criteria, installation, and maintenance procedures, and techniques that represent the general state of the art, but should not be construed as all-inclusive, especially where procedures and techniques are altered to meet special conditions. Where there are problems with a specific installation, it is suggested that the manufacturer of the backflow preventer be consulted.

These Standards were 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 have 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 this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.

3) This Standard was developed by consensus, which is defined by CSA Policy governing standardization — Code of good practice for standardization as “substantial agreement. Consensus implies much more than a simple majority, but not necessarily unanimity”. It is consistent with this definition that a member may be included in the Technical Committee list and yet not be in full agreement with all clauses of this Standard.

4) To submit a request for interpretation of this Standard, please send the following information to [email protected] and include “Request for interpretation” in the subject line:

a) define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch;

b) provide an explanation of circumstances surrounding the actual field condition; and

c) where possible, phrase the request in such a way that a specific “yes” or “no” answer will address the issue.

Committee interpretations are processed in accordance with the CSA Directives and guidelines governing standardization and are available on the Current Standards Activities page at standardsactivities.csagroup.org.

5) This Standard is subject to review within five years from the date of publication. Suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to [email protected] and include “Proposal for change” in the subject line:

a) Standard designation (number);

b) relevant clause, table, and/or figure number;

c) wording of the proposed change; and

d) rationale for the change.

1 Scope

1.1 Application

This Standard specifies requirements for the selection and installation of backflow preventers. Additional information on how backflow due to back siphonage and back pressure occurs, and how to select and apply specific devices, is included in Annexes A, B, and C.

1.2 Exclusions

1.2.1 Product exclusions

This Standard does not cover

a) construction requirements or performance tests, which are covered by the CSA B64 Series;

b) plumbing supply fittings, which are covered by ASME A112.18.1/CSA B125.1;

c) plumbing fittings, which are covered by CSA B125.3;

d) anti-siphon fill valves for water closet tanks, which are covered by ASSE 1002/ASME A112.1002/

CSA B125.12;

e) manually operated valves for use in plumbing systems, which are covered by ASME A112.4.14/CSA B125.14; and

f) pressurized flushing devices for plumbing fixtures, which are covered by ASSE 1037/ASME A112.1037/CSA B125.37.

1.2.2 Other exclusions

This Standard does not specify requirements for maintenance or field testing after the initial installation. Such requirements are specified in CSA B64.10.1.

1.3 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.

1.4 Units of measurement

This Standard is written in SI (metric) units. For conversion tables, see Annex D. Vacuum is expressed in pressure below ambient.