AWWA standard for double check valve backflow-prevention assembly

18 Pages·1990·0.963 MB·English

by  American Water Works Association., American National Standards Institute

American Water Works Association
ANSIIAWWA C510-97
(Revision of ANSVAWWA (2510-92)
AWWA STANDARD
FOR
DOUBLE CHECK VALVE BACKFLOW
PREVENTION ASSEMBLY
Effective date: Feb. 1, 1998.
First edition (AWWA C506) approved by AWWA Board of Directors Jan. 27, 1969.
This edition approved June 15, 1997.
Approved by American National Standards Institute Dec. 2, 1997.
AMERICAN WATER WORKS ASSOCIATION
6666 West Quincy Avenue, Denver, Colorado 80235
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STD-AWWA C510-ENGL 1777 0783350 0505777 707
A W A S tandard
This document is an American Water Works Association (AWWA) standard. It is not a specification.
AWWA standards describe minimum requirements and do not contain all of the engineering and
administrative information normally contained in specifications. The AWWA standards usually
contain options that must be evaluated by the user of the standard. Until each optional feature is
specified by the user, the product or service is not fully defined. AWWA publication of a standard
does not constitute endorsement of any product or product type, nor does AWWA test, certie, or
approve any product. The use of AWWA standards is entirely voluntary. AWWA standards are
intended to represent a consensus of the water supply industry that the product described will
provide satisfactory service. When AWWA revises or withdraws this standard, an oficial notice of
action will be placed on the first page of the classified advertising section of Journal AWWA. The
action becomes effective on the first day of the month following the month of Journal AWWA
publication of the official notice.
--`,,```,,`,`,`,`,,,`,,`,,,`,,-`-`,,`,,`,`,,`--- American National Standard
An American National Standard implies a consensus of those substantially concerned with its scope
and provisions. An American National Standard is intended as a guide to aid the manufacturer, the
consumer, and the general public. The existence of an American National Standard does not in any
respect preclude anyone, whether that person has approved the standard or not, from manufactur-
ing, marketing, purchasing, or using products, processes, or procedures not conforming to the
standard. American National Standards are subject to periodic review, and users are cautioned to
obtain the latest editions. Producers of goods made in conformity with an American National
Standard are encouraged to state on their own responsibility in advertising and promotional
materials or on tags or labels that the goods are produced in conformity with particular American
National Standards.
CAUTIONN OTICE:T he American National Standards Institute (ANSI) approval date on the front
cover of this standard indicates completion of the ANSI approval process. This American National
Standard may be revised or withdrawn at any time. ANSI procedures require that action be taken
to reaffirm, revise, or withdraw this standard no later than five years from the date of publication.
Purchasers of American National Standards may receive current information on all standards by
calling or writing the American National Standards Institute, 11 W. 42nd St., New York, NY 10036;
[phone].
Copyright O 1998 by American Water Works Association
Printed in USA
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STD-AWWA CSLU-ENGL 1777 0783350 0505778 843
Committee Personnel
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Consumer Members
P.J. Brady, Department of Public Utilities, County of Henrico,
Richmond, Va.
S.A. Brook, Orange County Public Utilities, Orlando, Fla.
E.J. Havlina, Los Angeles Department of Water and Power,
Los Angeles, Calif.
O.J. Jones, Cincinnati, Ohio
C.L. Nena, California Water Service Company, Montebello, Calif
P.W. Orvin, City of Jacksonville, Jacksonville, Fla.
General Interest Members
G.J. Angele Sr., Oak Ridge, Tenn.
S.F. Asay, Stuart F. Asay & Associates, Westminster, Colo.
T.K. Bsharat, National Fire Sprinkler Association, Patterson, N.Y.
R.A. Coates, Hazen & Sawyer, Miami, Fla.
J.T. Cowgill, Hazen & Sawyer, Hollywood, Fla.
H.D. Hendrickson, Water Service Consultants Inc., Exeter, N.H.
K.W. Kells,* Council Liaison, Connecticut Water Company,
Clinton, Conn.
F.E. Kenney Jr.,+ NEWWA, Milford, Mass.
John Phillips, WSSC, Laurel, Md.
E.S. Ralph,* Standards Engineer Liaison, AWWA, Denver, Colo.
R.W. Rivard, Connecticut Department of Public Health, Hartford, Conn.
P.H. Schwartz, University of Southern California, Los Angeles, Calif
G.R. Stiles, Seattle, Wash.
R.C. Williams, ATSDRAIHAC, Atlanta, Ga.
Prod ucer Members
R.H. Ackroyd, Watts Regulator Company, Lawrence, Mass.
P.H. Ahearn, Conbraco Industries Inc., Matthews, N.C.
J.L. Brewer, CMB Industries-Febco, Fresno, Calif,
*Liaison,n onvoting
t
Alternate
...
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STD-AWWA CSLU-ENGL 1997 0783350 0505779 78T
Les Engelmann, Ames Company Inc., Woodland, Calif. (AWWA)
L.W.F leury Jr., Hersey Products Inc., Cranston, R.I. (AWWA)
J.W. Furre=,*H ersey Products Inc., Fresno, Calif. (AWWA)
G.H. Swenson, G.H. Swenson Enterprises, Clifton Park, N.Y. (AWWA)
Dennis Whitelaw,* CMB Industries-Febco, Fresno, Calif. (AWWA)
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*Alternate
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~ ~ ~ ~~
STD.AWWA CSLO-ENGL 1797 0783350 0505780 4TL
Contents
ALE AWWA standards follow the general format indicated subsequently. Some uarìations from this format may be
found in a particular standard.
SEC. PAGE SEC. PAGE
Foreword 3 Definitions .......................................... 3
I Introduction ..... .. . . . . . . .. . .. .. .. . . . . . .. . .. . .. . . .. . vii 4 Requirements
1.A Background. .. .. .. . . .. .. .. . .. . . . .. ... .. .. .. .. .. . ... . vii 4.1 Materials ............................................... 3
1.B History ................................................ v.i.i. 4.2 General Design ..................................... 4
1.c Acceptance ..,.. .. . ... . . .. . .. .. .. . . . . .. .. .. .. .. . .. .. mi1 4.3 Detailed Design .................................... 5
II Special Issues ....................................... ix 4.4 Workmanship. ....................................... 8
III Use of This Standard. .......................... ix
1II.A Purchaser Options 5 Verification
and Alternatives ............................... ix 5.1 Testing and Uniformity ....................... 8
1II.B Modification to Standard. .................... ix
IV Major Revisions .................................... ix 6 Delivery
v Comments ............................................. ix 6.1 Marking ................................................. 8
6.2 Preparation for Shipment .................... 9
Standard 6.3 Amdavit of Compliance. ....................... 9
1 General Tables
1.1 Scope ...................................................... 1
1.2 Purpose .................................................. 1 1 Parameters for Double Check
Valve Backflow Prevention
1.3 Application ............................................. 1
Assembly ............................................ 5
2 References ........................................... 2 2 Thermal Test Minimum Flow
Rates .................................................. 7
V
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STD.AWWA CSLO-ENGL 1777 0783350 0505783 338 M
kor ewor ci
This foreword is for information only and is not a pari of AWWA C510.
I. Introduction.
I.A. Background. The production and preservation of safe potable water is
the objective of greatest priority for public water utilities and other agencies having
jurisdiction. When safe water has been produced and put into the public distribution
system, precautions must be taken to be certain that it is not contaminated with
water or liquids from other sources.
Almost all water-using premises may have actual or potential cross-connection
hazards. The water distribution systems of some premises served by public water
systems, such as hotels, hospitals, and industrial plants, can be quite complex. On
these premises, contaminated backflow into the public system can be a result of
backpressure or backsiphonage f7om appliances and equipment or &om cross-connection
with other supply sources. Cross-connection control programs usually require that
backfiow prevention assemblies be installed at the water service connections to
premises where potentially hazardous conditions exist.
Water users (utility customers) have a clearly implied responsibility to protect
the safety of water in the public supply system. Water users must also protect the
integrity of the water supply on their own premises. Protection of a building‘s piping
system must be done in accordance with the requirements of the local authority
having jurisdiction.
Cross-connections vary widely in degree of hazard. Generally, the degree of
protection against backflow resulting from a cross-connection should be commensu-
rate with the degree of hazard. Two types of backflow prevention assemblies are
commonly used: the double check valve assembly and the reduced-pressure principle
assembly. If local regulations or ordinances do not specify the type to use or the
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included in the joint committee’s final report published in the December 1958 edition
of Journal AWWA. The first chair, Ray L. Derby, then with the Los Angeles
Department of Water and Power, served until April 1964. From April 1964 until
March 1972, Gustave J. Angele Sr., plant sanitary engineer, Union Carbide Nuclear
Division, served as chair. From March 1972 until April 1983, Ernest J. Havlina, Los
Angeles Department of Water and Power, served as chair. From April 1983 until April
1993, Patrick J. Brady, Department of Public Utilities, County of Henrico, Richmond,
Va., served as chair. Since then, the work has been completed under the direction of
the present chair, James T. Cowgill, Hazen & Sawyer Engineers, Hollywood, Fla.
The first work of the committee resulted in the first edition of AWWA Manual
M14, which was published in the April 1966 edition of‘ Journal AWWA.
After publication of AWWA Manual M14, the committee produced a standard
that received final approval from the AWWA Board of Directors on Jan. 27, 1969, and
was designated as AWWA (2506-69, Standard for Backflow Prevention Devices-Reduced
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Pressure Principle and Double Check Valve Types. Revision of AWWA C506 was
approved in 1978. The 1978 edition was subsequently reaffirmed without revision in
1983.
In 1989, AWWA C506-78 was separated into two standards: ANSVAWWA C510
covers the double check valve backflow prevention assembly, and ANSUAWWA C511
covers the reduced-pressure principle backflow prevention assembly. This is the
second revision to ANSVAWWA (2510 and was approved by the AWWA Board of
Directors on June 15, 1997.
1.C. Acceptance. In May 1985, the US Environmental Protection Agency
(USEPA) entered into a cooperative agreement with a consortium led by NSF
International (NSF) to develop voluntary third-party consensus standards and a
certification program for all direct and indirect drinking water additives. Other
members of the original consortium included the American Water Works Association
Research Foundation (AWWARF) and the Conference of State Health and Environ-
mental Managers (COSHEM). The American Water Works Association (AWWA) and
the Association of State Drinking Water Administrators (ASDWA) joined later.
In the United States, authority to regulate products for use in, or in contact
with, drinking water rests with individual states.* Local agencies may choose to
impose requirements more stringent than those required by the state. To evaluate
the health effects of products and drinking water additives from such products, state
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4. Other references, including AWWA standards, Food Chemicals Codex,
Water Chemicals Codex,§ and other standards considered appropriate by the state or
local agency.
Various certification organizations may be involved in certifying products in
accordance with ANSINSF 61. Individual states or local agencies have authority to
accept or accredit certification organizations within their jurisdiction. Accreditation
of certification organizations may vary from jurisdiction to jurisdiction.
Appendix A, “Toxicology Review and Evaluation Procedures,” to ANSINSF 61
does not stipulate a maximum allowable level (MAL) of a contaminant for substances
not regulated by a USEPA final maximum contaminant level (MCL). The MALS of an
unspecified list of “unregulated contaminants” are based on toxicity testing
guidelines (noncarcinogens) and risk characterization methodology (carcinogens). Use
of Appendix A procedures may not always be identical, depending on the certifier.
~~~ ~~~
*Persons in Canada, Mexico, and non-North American countries should contact the
appropriate authority having jurisdiction.
?American National Standards Institute, 11 W. 42nd St., New York, NY 10036.
SNSF International, 3475 Plymouth Rd., Ann Arbor, MI 48106.
0 Both publications available from National Academy of Sciences, 2102 Constitution Ave.
N.W., Washington, DC 20418.
...
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STD-AWWA CSLU-ENGL 1997 m 0783350 0505783 LOU m
AWWA C510-97 does not address additives requirements. Thus, users of this
standard should consult the appropriate state or local agency having jurisdiction in
order to
1. Determine additives requirements including applicable standards.
2. Determine the status of certifications by all parties offering to certify
products for contact with, or treatment of, drinking water.
3. Determine current information on product certification.
II. Special Issues. This standard has no applicable information for this
section.
III. Use of This Standard. AWWA has no responsibility for the suitability
or compatibility of the provisions of this standard to any intended application by any
user. Accordingly, each user of this standard is responsible for determining that the
standard’s provisions are suitable for and compatible with that user’s intended
application.
1II.A. Purchaser Options and Alternatives. The following items should be
covered in the purchaser’s specifications:
1. Standard used-that is, ANSYAWWA C510, Double Check Valve Backflow
Prevention Assembly, of latest revision.
2. Whether for hot or cold water (Sec. 1.1).
3. Midavit of compliance (Sec. 6.3)’ if required.
4. Certificate of approval (Sec. 6.3), if required.
5. Materials if other than those specified in Sec. 4.1.
6. Size, flow, and pressure loss (Sec. 4.2.1)’ and number of assemblies
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1. The format has been changed to AWWA standard style.
2. Definitions for cosmetic and structural defects have been added (Sec. 3).
3. The operating temperature range for cold-water double check valve
backfiow prevention assemblies has been increased (Sec. 1.1).
4. Table 1, Parameters for Double Check Valve Backflow Prevention Assembly,
has been expanded to include sizes 1/4 in. (6 mm), 78 in. (9 mm), Y2 in. (12 mm), and
12 in. (305 mm).
5. The section on connections has been expanded to include grooved and
shouldered joints (Sec. 4.3.1.7).
6. The section on test cocks has been expanded to include requirements on
test connections (Sec. 4.3.1.8).
7. A new section on operation at rated temperature and pressure has been
added (Sec. 4.3.2.2).
8. Table 2, Thermal Test Minimum Flow Rates has been added.
9. A new section on casting requirements has been added (Sec. 4.4.4).
V. Comments. If you have any comments or questions about this standard,
please call the AWWA Standards and Materials Development Department,
[phone] ext. 6283, FAX [phone], or write to the department at 6666 W.
Quincy Ave., Denver, CO 80235.
ix
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m
STD-AWWA C5LO-ENGL 1777 0783350 0505784 O47
American Water Works Association
ANSUAWA C510-97
(Revision of ANSVAWWA (2510-92)
A W A S TANDARD FOR
DOUBLE CHECK VALVE BACKFLOW
PREVENTION ASSEMBLY
SECTION 1: GENERAL
Sec. 1.1 Scope
This standard covers the double check valve backflow prevention assembly. The
assembly shall be for operation on hot or cold water lines and capable of withstanding
a working water pressure of at least 150 psi (1,034 kPa) without damage to working
parts or impairment of function.
This standard covers hot and cold water double check valve backflow prevention
assemblies. All assemblies shall be designed to operate at a minimum temperature
range of 33°F to 140°F (1°C to 60°C). Hot water assemblies shall be designed to, at a
minimum, operate in water at a temperature range of 33°F to 180°F (1°C to 82°C).
A complete assembly consists of two internally loaded, independently operating
check valves, located between two tightly closing resilient-seated shutoff valves, with
four properly placed (see Sec. 4.3.1.8) resilient-seated test cocks.
Sec. 1.2 Purpose
The purpose of this standard is to provide the minimum requirements for double
check valve backfìow prevention assemblies, including materials, general and
detailed design, workmanship, and shipping and delivery.
Sec. 1.3 Application
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1
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STD-AWWA CSLU-ENGL 1797 D 0783350 0505785 T83 D
2 AWWAC510-97
SECTION 2: REFERENCES
This standard references the following documents. In their latest editions, they
form a part of this standard to the extent specified within the standard. In any case
of conflict, the requirements of this standard shall prevail.
ANSI*/ASMEt B1.20.1-Pipe Threads, General Purpose (Inch).
ANSUASME B16.1-Cast Iron Pipe Flanges and Flanged Fittings.
ANSIíASME B16.24-Cast Copper Alloy Pipe Flanges and Flanged Fittings
Class 150, 300, 400, 600,900, 1500, and 2500.
ANSIíAWWA CllO/A!21 .10-American National Standard for Ductile-Iron and
Gray-Iron Fittings, 3 In. Through 48 In. (75 mm Through 1,200 mm), for Water and
Other Liquids.
ANSIíAWWA C509-Standard for Resilient-Seated Gate Valves for Water
Supply Service.
ANSIíAWWA C550-Standard for Protective Epoxy Interior Coatings for Valves
and Hydrants.
ANSIíAWWA C606-Standard for Grooved and Shouldered Joints.
ASTMS A126-Standard Specification for Gray Iron Castings for Valves,
Flanges, and Pipe Fittings.
ASTM A153-Standard Specification for Zinc Coating (Hot-Dip) on Iron and
Steel Hardware.
ASTM A276-Standard Specification for Stainless Steel Bars and Shapes.
ASTM A3 13/A313M-Standard Specification for Stainless Steel Spring Wire.
ASTM A395-Standard Specification for Ferritic Ductile Iron Pressure-Retaining
Castings for Use at Elevated Temperatures.
ASTM A536-Standard Specification for Ductile Iron Castings.
ASTM B61-Standard Specification for Steam or Valve Bronze Castings.
ASTM B62-Standard Specification for Composition Bronze or Ounce Metal
Castings.
ASTM B139-Standard Specification for Phosphor Bronze Rod, Bar, and
Shapes.
ASTM B159-Standard Specification for Phosphor Bronze Wire.
ASTM B584-Standard Specification for Copper Alloy Sand Castings for
General Applications.
ASTM D224O-Standard Test Method for Rubber Property-Durometer Hardness.
AWWA M14-Recommended Practice for Backflow Prevention and Cross-
Connection Control.
*American National Standards Institute, 11 W. 42nd St., New York, NY 10036.
?American Society of Mechanical Engineers, 345 E. 47th St., New York, NY 10017.
$American Society for Testing and Materials, 100 Barr Harbor Dr., West Conshohocken, PA
19428-2959.
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