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1、STD-ASSE/SAN L048-ENGL 1977 U757772 0001i504 b24 ASSE Standard #lo48 ASSE Board Approved: September 20,1999 ANSI Accredited December 3, 1999 American Society o f Sanitary Engineering PerFormance Requirements for Double Check Detector Fire Protection Backflow Prevent ion Assem blies 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 00:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- STD-ASSEISAN Lil4B-ENGL 1779 D 0759772 OOUL505
3、 5b0 General Information Neither this standard, nor any portion thereof, may be reproduced without the written consent of the American Society of Sanitary Engineering. No product may be said to be ASSE approved unless the manufacturer has applied to the ASSE has had his product tested according to t
4、he applicable ASSE Standards, and when the product has passed the test, displays the ASSE Seal on the product. Instructions for receiving the authorization to display the Seal are available from ASSE Central Office. Organizations wishing to adopt or list any ASSE Standard should print the ASSE Stand
5、ard Number on the cover page first and in equal or larger type to that of the adopting or listing organization. American Society of Sanitary Engineering Westlake, Ohio Copyright O 1999, 1993, 1990 All rights reserved. Double Check Detector Fire Protection BacMlow Prevention Assemblies ASSE #I048 Rev
6、ised: 1999 ANSI Accredited: 1999 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- Foreword This foreword sha
7、ll not be considered a part of the standard, however, it is offered to provide background information. ASSE Standards are developed in the interest of consumer safety. The recognition of probable sources or causes of pollution of a potable water supply system and the application of essential devices
8、, or means, to prevent the entrance of pollutants to the potable water system causing it to become unfit for human consumption, is vital to the maintenance of its continued potability. This standard focuses on those devices known as double check detector fire protection assemblies (DCDF), which will
9、 fulfill this protective need. The standard was retitled in the 1999 revision to add “fire protection” to better describe the devices primary use. Typically installed but not limited to fire protection systems, the devices described are primarily designed for two functions. The protection of the pub
10、lic water supply from pollutants found in fire sprinkler systems is the primary function for these backflow preventer. These devices are also designed to detect low rates of flow up to 0.126 L/s (2 GPM) within the sprinkler system caused by leakage or unauthorized use. This standard also allows prov
11、isions for alarm signaling devices to be included in the assembly. 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 Safe Drinking Water Act, United States Public Law 93-5
12、23. The working group which developed this standard revision, was set up within the framework of the Standards Committee of the American Society of Sanitary Engineering. Recognition is made of the time volunteered by members of this working group and of the support of the manufacturers who also part
13、icipated in the meetings for this standard. This standard does not imply ASSES endorsement of a product which conforms to these requirements. Compliance with this standard does not imply acceptance by any code body. It is recommended that these devices be installed consistent with local codes by qua
14、lified and trained professionals. Double Check Detector Fire Protection Backflow Prevention Assemblies ASSE #i 048 Revised: I999 ANSI Accredited: 1999 iii Previous page is blank Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/56
15、26000001 Not for Resale, 12/24/2006 00:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- This standard was promulgated in accordance with procedures developed by the American National Standards institute (ANSI). This edition of the standard was approved by the ASSE Boar
16、d of Directors on September 20, 1999, as an ASSE standard. iv Double Check Detector Fire Protection BacMlow Prevention Assemblies ASSE #lo48 Revised: 1999 ANSI Accredited: 1999 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/562
17、6000001 Not for Resale, 12/24/2006 00:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- 1998-99 Product Standards Committee Richard J. Prospal Standards Committee Chairman Reliance Mechanical Cleveland, Ohio Rand H. Ackroyd Rand Engineering Newburyport, Massachusetts Mi
18、chael Bec kwit h State of Wisconsin DILHR Madison, Wisconsin Charles Caruana Canadian Standards Association Etobicoke, On ta rio, Canada Sidney Cavanaugh United Association of Plumbers and Pipefitters Washington, D. C. Shannon M. Corcoran ASSE Standards Coordinator Westlake, Ohio A. Richard Emmerson
19、 Chicago faucet Company Des Plaines, Illinois Greg Gress Building Officials and Code Administrators, Inc. Country Club Hills, Illinois Patrick J. Higgins P. J. Higgins & Associates Frederick, Maryland Dale Holloway SGS United States Testing Company Tulsa, Oklahoma Michael Kobel International Associa
20、tion of Plumbing and Mechanical Officials Walnut, California Valentine Lehr, P.E. Lehr Associa tes New York, New York Herbert Panzer, P.E. Herbert Panzer, PE, Consulting Engineer New York, New York S ha b bi r Rawal pi nd iwala Kohler Company Kohler, Wisconsin Jack Vilendre Precision Plumbing Produc
21、ts, Inc. Portland, Oregon David Viola Plumbing Manufacturers Institute Schaumberg, Illinois Joseph C. Zaffuto, P.E. ASSE Staff Engineer Westlake, Ohio Double Check Detector Fire Protection Backflow Prevention Assemblies ASSE #I048 Revised: 1999 ANSI Accredited: 1999 V Copyright American Society of S
22、anitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- Standard #I 048 Working Group Rand H. Ackroyd Working Group Chairman Rand Engineering Newb
23、uryport, Massachusetts Thomas E. Archibald Grinnell Corporation Cranston, Rhode Island Ray Cellemme Conbraco Industries, Inc. Matthews, North Carolina I Gunnar Collins Collins Backflow Specialists, Inc. Palatine, Illinois Bill Dunmire FEBCO/CMB Industries, Inc. Fresno, California Michael Eisenhauer
24、Chicago Backflow Chicago, Illinois Scott Farn ham The Ford Meter Box Co., Inc. Wabash, Indiana Scott Grainger Grainger Consulting Mesa, Arizona Roland, Huggins American Fire Sprinkler Associa tion Dallas, Texas Brad NoIl Wilkins Operations, Zurn Industries Paso Robles, California Robert Purzycki BA
25、VCO Long Beach, California Paul Schwartz University of Southern California FCCC&HR Los Angeles, California George Swenson Flomatic Valves, Inc. Giens Falls, New York James Wehinger Wisconsin Department of Commerce Friendship, Wisconsin Joseph C. Zaffuto, PE American Society of Sanitary Engineering W
26、estlake. Ohio Stan Ziobro Factory Mutual Norwood, Massachusetts vi Double Check Detector Fire Protection Backflow Prevention Assemblies ASSE #I048 Revised: 7999 ANSI Accredited: 1999 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Tex
27、as/5626000001 Not for Resale, 12/24/2006 00:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- Table of Contents Section I 1 1 .O General . 1 .I Application 1 1.2 Scope . 1 1.3 Limitations on Design 2 1.4 Reference Standards. . 3 Section II 4 2.0 Test Specimens . . 4 2.1
28、 Samples Submitted for Test . 4 2.2 Samples Tested 2.3 Drawings . 2.4 Rejection . 2.5 Manifold Device . 4 2.6 Alternate Orientation . Section III . 5 3.0 Performance Requirements and Compliance Testing 5 3.1 Hydrostatic Test of Complete Device . 5 Figure 1 . 5 3.2 Hydrostatic Test of Va . 6 3.3 Drip
29、 Tightness of Check Valves . 6 3.4 Allowable Pressure Loss at . Table 1 . . 7 3.5 Check Valve Performance Test 8 3.6 Bypass Flow Detection 8 3.7 Seat Adhesion Test 9 3.8 Temperature Range . 9 Table 2 . 10 3.9 Testing for Alternate Orientation . . 10 3.1 O Cycle Test - Field Test 10 3.1 i Body Streng
30、th Test 11 Section IV . 12 4.0 Detailed Requirements . 12 4.1 Materials 4.2 Marking and Installation Instructions . 13 4.3 Installation and Maintenance Instructions . 13 4.4 Maintenance . 13 4.5 Field Testing 13 Section V 14 5.0 Definitions . 14 Double Check Detector Fire Protection Backflow Prevent
31、ion Assemblies ASSE #I048 Revised: 1999 *ANS/ Accredited: I999 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:37:06 MSTNo reproduction or networking permitted without license from IHS -,
32、-,- STD-ASSEISAN 1048-ENGL 1997 W 0759972 00015LL BbLi m Double Check Detector Fire Protection Backflow Prevention Assem blies The purpose of a Double Check Detector Fire Protection Backflow Prevention Assembly is to keep polluted water from fire protection systems from flowing back into a potable w
33、ater distribution system when some abnormality in the system causes the pressure to be temporarily higher in the polluted part of the system than in the potable water piping. 1.2.1 Description This standard applies to the type of backflow prevention device identified as DCDF (Double Check Detector F
34、ire Protection). These devices consist of two (2) independently-acting check valves, internally force loaded to a normally closed position. These devices are designed to operate under continuous pressure conditions. The device shall include two (2) tightly closing shut-off valves, and contain proper
35、ly located test cocks. The device also includes a bypass line around the second check of the main line device which provides a visually or audible indication of system leakage or unauthorized use of water. The bypass device includes a water meter or alarm signaling device, or both, and a bypass chec
36、k device, or a listed ASSE 1 O1 5 double check valve device. This standard also applies to Manifold DCDF devices . They consist of two or more complete DCDF devices in parallel. The devices do not need to be of the same pipe size. The manifold size shall be identified by the single inlet and outlet
37、of the manifold DCDFdevice. It shall consistof shut- off valves on the inlet and outlet of each of the devices in the manifold and the shut-off valves shall be line sized to each DCDF device in the manifold. 1.2.2 Size Range Connection pipe sizes in millimeters are 50, 65, 75, 100, 150, 200, 250, 30
38、0, 350, 400 and 518 meter (and in inches are 2, 2-112, 3, 4, 6, 8, 10, 12, 14, 16 and 5/8 meter). 1.2.3 Pressure Range Detector A DCDF device shall be designed for a minimum working pressure of 1206 kPa (175 p.si.). I .2.4 Temperature Range DCDF devices shall be designed to be installed at water flo
39、w temperatures of at least 0.6 “C to 43 “C (33 O F to 110 OF). Double Check Detector Fire Protection Backnow Prevention Assemblies ASSE #I048 Revised: 1999 ANSI Accredited: 1999 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/56
40、26000001 Not for Resale, 12/24/2006 00:37:06 MSTNo reproduction or networking permitted without license from IHS -,-,- STD-ASSE/SAN 1048-ENGL 1779 W 0757772 0001512 7TO W 1.3.1 Structural Strength All parts of the device shall be designed to withstand without permanent distortion, the stresses devel
41、oped by the hydrostatic test pressure, as well as the stresses resulting from a specified water working pressure coincident with operation under a specified unbalanced pressure condition. 1.3.2 Mechanical Function 1.3.2.1 Female Pipe Threaded Connections Female pipe threaded connections shall be tap
42、ped into bosses in the body and shall be so constructed that it will not be possible to run a pipe into them farenough to restrict the flow through the assembly or interfere with working parts. 1.3.2.2 Repairability (a) The internal parts of the device shall be accessible for inspection, repairs or
43、replacements. (b) All replaceable parts of the devices of the same size and model shall be interchangeable with The design shall permit this servicing without removing the device from the line. the original parts. 1.3.2.3 Delivery Instructions All devices less the 65 mm (2 1/2 inches) in size, which
44、 consist of independent components assembled to provide the complete device shall be delivered for installation completely as- sembled. Devices sized 65 mm (2 1/2 inch) and larger shall be allowed, at the option of the manufacturer, to be shipped with the shut-off valves unattached from the device,
45、but shipped together. 1.3.2.4 Test Cock Location Test cocks shall be provided in the following locations: (a) Between the inlet shut-off valve and the first checkvalve by using the shut-off valves to isolate (b) Between the check valves. (c) Between the second check valve and the outlet shut-off val
46、ve. the device. 1.3.2.5 For devices up to and including 50 mm (2 inch) pipe size, a minimum test cock size shall be 3 mm (1/8 inch) or SAE J513F 8 mm (1/4 inch), ANSI 870. For devices 65 mm (2 1/2 inch) and larger, minimum test cock size shall be 15 mm (1/2 inch). Caps shall be provided on SAE type
47、test cocks to protect the male outlet threads. Test Cock Size Inlet and Outlet Connection 1.3.2.6 Field Testing See the ASSE Series 5000. 1.3.2.7 Shut-off Valves Resilient seating shut-off valves shall be tight seating, UL listed for fire use, and as part of the device shall meet all of the material
48、 specifications and hydraulic testing specifications. 1.3.3 By-pass Line The bypass line shall include an ASSE 1015 doublecheck backflow prevention deviceor a bypass check assembly with a shut-off valve upstream and downstream in the bypass line. The bypass line shall include two test cocks, one between the upstream shut-off and the bypass check and one downstream of the bypass check but before the downstream shut-off. Flow rates up to and including 0.126 Us (2 GPM) shall be directed through the bypass. 2 Double Check Detector Fire Protection Backt