ASSE-1024-1994.pdf
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1、ASSE Standard #I024 Issued: 1979 Revised: 1980 ANSI Approved: March, 1984 Revised: April, 1988 ANSI Approved: March, 1990 Revised: September, 1994 ANSI Approved: April 15,1998 American Society of Sanitary Engineering Peiformance Requirements for Dual Check Valve Backflow Preventers An American Natio
2、nal Standard Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:28:30 MSTNo reproduction or networking permitted without license from IHS -,-,- General Information Neither this Standard, nor
3、 any portion thereof, may be reproduced without the written consent of the American Society of Sanitary Engineering. Although this Standard may be used as a benchmark for in-house evaluation, no product may be said to be A.S.S.E. approved unless the manufacturer has applied to the A.S.S.E., has had
4、his product tested by an official A.S.S.E. recognized independent laboratory, according to the applicable A.S.S.E. Stan- dard, and when the product has passed the test, displays the A.S.S.E. Seal on the product. Instructions for receiving the authorization to display the Seal are available from the
5、A.S.S.E. Central Office. It is recommended that all devices designed for plumbing systems, especially those which pertain to public health and safety, should be installed consistent with local codes by qualified and trained professionals. American Society of Sanitary Engineering Westlake, Ohio Copyr
6、ight O 1994, 1988, 1979 All rights reserved. Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:28:30 MSTNo reproduction or networking permitted without license from IHS -,-,- ASSE #lo24 Dua
7、l Check Backflow Preventers Revised: 1994/ANSI: 1998 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:28:30 MSTNo reproduction or networking permitted without license from IHS -,-,- Forewo
8、rd The American Society of Sanitary Engineering for Plumbing and Sanitary Research is dedicated to the preservation of public health and safety through “Prevention Rather than Cure.“ Prevention of contamination or pollution of potable water in plumbing systems is one of the major objectives of the S
9、ocietys Standards Program, which is addressed to the development and promul- gation of Standards embracing performance criteria for manufactured plumbing components designed to safeguard public health and safety. The recognition of probable sources or causes of contamination or pollution of a potabl
10、e water system whereby it becomes unfit or undesirable for human consumption, is vital to the maintenance of its con t i n ued pota bi I it y. There are two basic and practiced methods for the protection of potable water supplies: (a) Protection by containment is the isolation, by a suitable means,
11、of the system within the premises supplied, which could be a source of contamination or pollution, from the vendors or public water supply system. (b) Protection of each individual outlet within the premises which could be a source of contamina- tion or pollution, by a suitable device or means. Prot
12、ection by containment protects the vendors or public water supply only. It does not provide protection within the premises supplied. In modern plumbing systems, there are many situations where backflow could occur due to back pressure conditions. In some cases the backflow of pollutants into the pot
13、able water system could cause serious health hazards, while in other cases the backflow of pollutants into the potable water system would make it undesirable, yet not a health hazard, to the persons consuming it (low hazard). This standard focuses on those devices know as Dual Check Valves, which wi
14、ll fulfill “Low Hazard“ protective needs. The devices described are suitable for either protection by containment at residential supply service lines, or protection of individual outlets where pollutants, which could be caused to enter the potable water, are of low hazard. These devices are generall
15、y suitable for cold water service under continuous or intermittent pressure conditions. Usage with hot water is limited to the temperature specified by the manufacturer, and when certified under this standard. This standard was first adopted in 1979, and was the latest addition to theA.S.S.E. Backfl
16、ow Preventer Standards, each of which covers a different type of backflow protection device, each tailored to the protective requirements essential to the specific system conditions in which it is installed and the degree of hazard involved. The A.S.S.E. working group in charge of revising this stan
17、dard was set up in compliance with and authorized by the Administrative Procedures for the A.S.S.E. Standards Committee. Although many of the material specifications are detailed within Section 1.4 of this standard, it is the responsibility of the manufacturer to comply with the requirements of the
18、Safe Drinking Water Act, United States Public Law 93-523. ASSE #?O24 Dual Check Backflow Preventers Revised: 1994/ANSi: 1998 . 111 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:28:30 MS
19、TNo reproduction or networking permitted without license from IHS -,-,- 1993-94 A.S.S.E. Standards Committee Richard Prospal Standards Committee Chairman Reliance Mechanical, Cleveland, Ohio Ranci Ackroyd Watts Regulator Company, North Andover, Massachusetts Sidney Cavanaugh Delta Faucet Company, In
20、dianapolis, Indiana Donald Dickerson Dickerson and Associates, Sherman Oaks, California Richard Em merson Chicago Faucet Company, Des Plaines, Illinois Gilbert Kissling Texas State Board of Plumbing Examiners, Austin, Texas Valentine Lehr, P.E. I nh,r A n n n n ; n + n n A l n a a s VnrL hin. Vnrl,
21、LGIII noouwaitzo, I V G Y Y ruin, I V G Y Y iuin Herb Panzer, P.E. Warren - -na- r - - l : - r l b- b L r A r . . i r r b r r n - -:Ar r 6 e - r L n pi caaui e VI iwu LI LII I IC LI IC I aicu wu1 nii iy pi caaui c appiicu LU LI IC UUWI iali cai I I aiuc VI caw I 3.3.2 Procedure 3.3.2.1 Upstream Chec
22、k Valve Install the device as shown in Figure 1 of this Standard, with a sight glass (See Figure 2 of this Standard), shut-off and drain cock installed in the tee upstream of the inlet check valve. Hold the downstream check valve partially open (fully clear of its seat). Purge the device of air, clo
23、se the supply valve, open the shut-off cock to the sight glass. Adjust the water level in the sight glass to be at the height not less than that corresponding to the top of the water space in the device. Raise the pressure downstream of the check valve to two (2) times the rated working pressure of
24、the device and record the water level in the sight glass. Hold for not less than five (5) minutes. Observe for indications of damage or leakage by the check valve. Water rise due to disc compression is not cause for rejection. 4 ASSE #I024 Dual Check Backnow Preventers Revised: ?994/ANSI: i998 Copyr
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