B64.10-11/B64.10.1-11

Selection and installation of backflow preventers/Maintenance and field testing of backflow preventers

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CSA Standards Update Service

B64.10-11/B64.10.1-11

November 2011

Title: Selection and installation of backflow preventers/Maintenance and field testing of backflow preventers

Pagination: 146 pages (xi preliminary and 135 text), each dated November 2011

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CSA Standards

B64.10-11/B64.10.1-11

Selection and installation of backflow preventers/Maintenance and field testing of backflow preventers

Published in November 2011 by Canadian Standards Association A not-for-profit private sector organization

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ISBN 978-1-55491-715-0

Technical Editor: Lauro Pilla

© Canadian Standards Association — 2011

All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.

© Canadian Standards Association

Contents

Selection and installation of backflow preventers/ Maintenance and field testing of backflow preventers

Technical Committee on Backflow Preventers and Water Pressure Reducing Valves vii

Preface x

B64.10-10, Selection and installation of backflow preventers

1. Scope 3

   1. Application 3

   2. Exclusions 3

   3. Terminology 3

   4. Measurement 3

      
      

2. Reference publications 3

   
   

3. Definitions, abbreviations, and symbols 4

   1. Definitions 4

   2. Abbreviations 9

   3. Symbols 10

      1. Backflow preventers 10

      2. Vacuum breakers 11

      3. Other symbols 12

         
         

4. Backflow prevention methods and devices 12

   1. Air gap 12

      1. General 12

      2. Hazardous installations 12

      3. Use 12

   2. Barometric loop 13

      1. General 13

      2. Use 13

      3. Limitations 13

   3. Mechanical backflow preventers 14

      1. Available types 14

      2. Vacuum breaker backflow preventers — General 14

      3. AVB devices 15

      4. PVB devices 16

      5. SRPVB devices 18

      6. HCVB and HCDVB devices 20

      7. DCAP and DCAPC backflow preventers 21

      8. RP and RPF backflow preventers 24

      9. DCVA and DCVAF backflow preventers 25

      10. DuC and DuCF backflow preventers 27

      11. LFVB devices 27

      12. DuCV backflow preventers 28

      13. SCVAF backflow preventers 29

      14. Backflow preventer, air space type (ASVB) 29

          
          

5. Selection of backflow preventers 30

   1. General 30

   2. Categories of hazards 31

   3. Principal ways of providing protection 31

      
      

      November 2011 iii

      B64.10-11/B64.10.1-11 © Canadian Standards Association

      
      

      
      

      1. General 31

      2. Individual protection 32

      3. Zone protection 32

      4. Premises isolation 32

   4. Selection guide 33

   5. Backflow from fire protection systems 34

   6. Backflow from water fill stations 35

   7. Backflow from temporary water services 35

   8. Backflow from irrigation systems 36

      1. Above-ground irrigation systems 36

      2. In-ground irrigation systems 36

   9. Backflow from hydronic heating systems 36

   10. Heat exchangers 37

       
       

6. Installation requirements 37

   1. General requirements 37

      1. Accessibility 37

      2. Clearances 37

      3. Support and restraint 38

      4. Bypasses 38

      5. Field testing at installation 38

      6. Installation of DCAPC backflow preventers 38

      7. Flushing 39

      8. Installation of a vacuum breaker, air space type 39

   2. Sizing 39

   3. Working pressures and temperatures 39

   4. Shut-off valves and test cocks 39

   5. Strainers 39

   6. Location 40

   7. Parallel service 40

   8. Connections to drains 40

   9. Thermal expansion 40

   10. Installation orientation 41

   11. Enclosures and protection from freezing 41

Annexes

A (informative) — How backflow can occur 43

B (informative) — Guide to the assessment of hazards 46

C (informative) — Water-hauling equipment and backflow devices 54

D (informative) — Conversion tables 55

E (informative) — Model backflow prevention bylaw 56

F (informative) — Domestic hot water liquid to liquid heat transfer systems 61

G (informative) — Heat-transfer fluids 63

Tables

1. — Types of backflow preventers and vacuum breakers and applicable CSA Standards 14

2. — Selection guide for backflow preventers 33

3. — Selection guide for backflow preventers for fire protection systems 35

4. — Clearances, mm 38

Figures

1. — Air gap 12

2. — Barometric loop 13

iv November 2011