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1、ASSE Standard R4024 - 2004 ASSE Board Approved: FEBRUARY? 2004 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without li
2、cense from IHS -,-,- Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- Neither this standard
3、, nor any portion thereof, may be reproduced without the written consent of the American Society of Sanitary Engineering. No product may besaid to beASSE approved unlessthe manufacturer has applied tothe ASSE has had his product tested according to the applicable ASSE Standards, and when the product
4、 has passed the test, displays the ASSE Seal on the product. Instructions for receiving the authorization to display the Seal are available from ASSES International Office. Organizations wishing to adopt or list any ASSE Standard shou Id print the ASSE Standard number on the cover page first and in
5、equal or larger type to that of the adopting or listing organization. American Society of Sanitary Engineering Westlake, Ohio Copyright O 2004, 1 994,1988,1979 All rights reserved. Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/11111
6、11001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resal
7、e, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- This fureword shall not be cunsidered a part of the standard, however, it is uffered to provide background infurmatiun. The American Suciety uf Sanitary Engineering fur Plumbing and Sanitary Research is
8、dedicated tu the preservatiun uf public health and safety through “Prevention Rather than Cu re. I Preventiun of contaminatiun ur pullutiun uf putable water in plumbing systems is une uf the majur ubjectives uf the Sucietys Standards Program, which is addressed to the development and promulgation of
9、 Standards embracing pedormance criteria fur manufactured plumbing cumponents designed tu safeguard public health and safety. The recugnition of probable suurces ur causes of contamination or pollution of a potable water system whereby it becumes unfit ur undesirable for human consumption, is vital
10、to the maintenance of its continued putability. are twu basic and practiced methuds for the prutectiun uf putable water supplies: Protectiun by containment is the isolatiun, by a suitable means, uf the system within the premises supplied, which could be a source of contaminatiun ur pullution, frum t
11、he vendurs ur public water supply system. Prutection of each individual uutlet within the premises which cuuld be a source of cuntaminatiun or pullution, by a suitable device or me ans Prutection by containment prutects the vendorbs or public watersupply only. It dues not pruvide protection within t
12、he premises supplied. In mudern plumbing systems, there are many situations where backfluw cuuld uccur due to back pressure conditions. In some cases the backflow uf pullutants into the putable water system cuuld cause serious health hazards, while in uther cases the backfluw of pollutants into the
13、potable water system would make it undesirable, yet nut a health hazard, tu the persuns consuming it (law hazard). This standard fucuses on those devices know as Dual Check Valves, which will fulfill “Luw Hazard I prutect ive needs I The devices described are suitable fur either prutectiun by contai
14、nment at residential supply service lines, ur prutectiun of individual uutlets where pullutants, which cuuld be caused tu enter the potable water, are uf luw hazard. Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=lis
15、tmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- These devices are generally suitable for cold water service under continuous or intermittent pressure conditions. Usage with hot water is limited to the temperature specified b
16、y the manufacturer, and when certified under this standard. This standard was first adopted in 19979, and was the latest addition to the ASSE Backflow Preventer Standards, each of which covers a different type of backflow protection device, each tailored to the protective requirements essential to t
17、he specific system conditions in which it is installed and the degree of hazard involved. Although many of the material specifications are detailed within Section 4.1 of this standard, it is the responsibility ofthe manufacturer to comply with the requirements of the Safe Drinking Water Act, United
18、States Public Law 93-523. This standard was promulgated in accordance with procedures developed by the American National Standards institute (ANSI). Compliance with this standard does not imply acceptance by any code group unless the standard has been adopted by the code, Copyright American Society
19、of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- Richard J, Prospal Producf Standards Commitfee Chairman Prosgal Consu
20、lting Servicesf inc. Brunswick, Ohio and Hm ckroyd Rand Engineering Newburygori, Massachusetts State of Wisconsin Depafiment of Commerce Madison, Wisconsin Gunnar o. coliiins Collins Backflow Speciaisfs. hc. Paiatine. Minois Jud Collins Oklahoma Sfate Health Depadmenf Okiahoma City, Oklahoma ASSE St
21、andards Coordinator Westiake, Ohio ichard erson on General fn ferest Buffaio Grove. Mnois Steven Haazzard ASSE Sfaffngineer Westlake, Ohio Dale Ho! Ioway SGS United States Testing Company Tulsa, Oklahoma IchaeI oe fnternafional Association of Plumbing and Mechanical Officials Walnuf? California a l
22、e n n Lehr, “E. Lehr Associates New York, New York United Association of Plumbers and Pigefifters Washington, D. C. Perry eIkIe, Jr= Perry W- Meikie Consulting Engineer Antioch, Caiifornia awal p i nd iwala Kohler Company Kohler, Wisconsin Lynne i n c k internationai Code Council, in. Country Chb Hi
23、k, mmis Jack VIIendre Precision Plumbing Products, inc. Pofyland, Oregon David Viola Plumbing Manufacturers hstitute Scha umberg, Iiiinois osep ph c. a u t o , P-E ASSE Staff Engineer Westjake, Ohio Dual Check BackBiow Preventers ASSE $1024 - 2004 Copyright American Society of Sanitary Engineering P
24、rovided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- Rand Hm d Rand Engineering Ne wburygo and shall be capable of maintaining an inlet pressure eq
25、ual to 460.0 psi (1103.2 kPaj or the manufacturers maximum rated working pressure ofthe device. Purge the system of air. Gradually increasethe FlowofIsiater through the device until the maximum intermittent flow rate as indicated in Table4 is reached for the device at its maximum rated working press
26、ure. Maintain the pressure and flow settings for five (5) minutes. Observe for external leaks or other indications of damage. Retest the device to Section 3.5. 3.8.3 Criteria Any indications of internal part damage or dislocation of parts that prevents the device from providing backflow protection s
27、hall result in the rejection of the device. Dual Check BackBk2w Preventers ASSE $1024 - 2004 3 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or
28、 networking permitted without license from IHS -,-,- Solder and fluxes containing lead in excessof0.2% shall not be used in contact with potablewater. Metal alloy in contact with potable water shall not exceed 8% lead. 4.4 .i Non-Ferrous Cast Parts Non-ferrous cast parts shall have a corrosion resis
29、tance at least equal to seventy-eight percent (78%) copper. 4.12 Bodies and internal non-cast parts shall be of a material having a corrosion resistance at least equal to a non-ferrous alloy of not less than fifty-eight (58%) percent copper, Bodies and Internal Non-Cast Parts 4.4.3 Springs Springs i
30、n contact with the water Flowing through the device shall have a corrosion resistance at least equal to stainless steel, series 300. 4.4,4 FIexible Non-MetaIIic Parts Valve discs, seat facings or other flexible nonmetallic parts shall be designed For continuous exposure to water at the maxim um rate
31、d operating tem peratu re and pressure of the device without change in physical characteristics which prevent full compliance with all requirements of the sta nd a rd 4.4 -5 Metal to metal seating of check valves shall be prohibited. Either seat, valve disc or both shall be of non-metallic materials
32、 which will provide pressure tight seating and resenting. MetaI to Metal Seating 4.4 -6 Seat Rings Metallic seat rings shall be of a non-ferrous material having a corrosion resistance at least equal to seventy-eight (78%) copper. 4.4 -7 End Connections Thedevice shall be constructed with a union or
33、Flanged end connection for easeof installation and repair. or with in-line accessibility of all internal parts. Female pipe threaded connections shall be so constructed that itwill not be possible to run a pipe into the device farenough to restrict the flow through the device or interfere with worki
34、ng parts, 4.4.7.4 Tapered Threads Tapered pipe threads shall be in compliance with ANSIIASME B i .20.4. 4.1 -7.2 EBfyseal Threads 5ryseal shall be in compliance with ANSI /ASME Bi.203. 4.4.7.3 Flange Connections Pipe flanges shall conform to AVWA Standard C700-90 For bronze flanges. 4.1 -7.4 Other C
35、onnerations This standard is not intended to prohibit the use of other connections which comply with the approved standard. I0 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/200
36、7 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- (a) The internal parts ofthe devices shall be accessible for inspection, repairs or replacements. fb) All replaceable parts ofthe assemblies ofthe same size and model shall be interchangeable with the original parts
37、. 43.1 Marking of Devices 42%1,1 Required Markings Each device shall be marked with the following information in a location visible from the installed position: (a) Name of manufacturer or trademark. fb) Type and model number ofthe device, (c) Maximum rated working pressure. (dj Maximum water temper
38、ature, for which the device is designed. (e) Date of manufacture or serial number or other marking consistent with the manufacturers (f) Nominal valve size. (gj The direction of water fl5w through the device shall be shown. standard practice. 4.3.12 App!ication of: Markings The markings shall be cas
39、t, etched, stamped or engraved on the body ofthe device, or on a brass or stainless steel plate securely &ached to the device with a corrosion resistant means. 4.3.2 !nstalIation Instructions 4,3.2.4 Instructions with Packaging Complete instructions for installation shall be packaged with the device
40、. Drawings or schematic sketches which are required for the correct installation of the device shall be part of these instructions along with a note that all devices shall be located in accessible locations. 4,322 Fie!d Repair Instructians All devices shall be capable of being maintained or repaired
41、 in the field. Maintenance and repair instructions shall be furnished with all repair parts. Dual Check BackBkw Preventers ASSE $1024 - 2004 11 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for
42、Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- Definitions in the standard shalltake precedenceover any other publication, Definitions not shown are found in the Plumbing Dictionary (Fifth Edition) published by ASSE. Copyright American Society o
43、f Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyright American Society of Sanitary Engineering Provided by IHS und
44、er license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 02:19:39 MSTNo reproduction or networking permitted without license from IHS -,-,-