1、ASSE Standard #1015-2011ASSE Board Approved: August 2011ANSI Approved: August 2011An American National StandardPerformance Requirements for Double Check Backflow Prevention Assemblies and Double Check Fire Protection Backflow Prevention AssembliesASSE InternationalDouble Check Backflow Prevention As
2、semblies and i Double Check Fire Protection Backflow Prevention AssembliesASSE 1015-2011General InformationNeither this standard, nor any portion thereof, may be reproduced without the written consent of ASSE International.Instructions for receiving authorization to display the ASSE Seal are availab
3、le from ASSEs International Office. Organizations wishing to adopt or list any ASSE Standard should print the ASSE Standard number on the cover page first and in equal or larger type to that of the adopting or listing organization.ASSE InternationalMokena, IllinoisCopyright 2011, 2009, 2005, 1999, 1
4、993, 1988, 1971All rights reserved.ii Double Check Backflow Prevention Assemblies and Double Check Fire Protection Backflow Prevention AssembliesASSE 1015-2011Double Check Backflow Prevention Assemblies and iii Double Check Fire Protection Backflow Prevention AssembliesASSE 1015-2011ForewordThis for
5、eword shall not be considered a part of the standard. However, it is offered to provide background information.ASSE Product Standards are developed in the interest of consumer safety.The recognition of probable sources or causes of contamination of a potable water supply system and the application o
6、f essential devices, or means, to prevent the entrance of contaminants to the potable water system, causing it to become unfit for human consumption, is vital to the maintenance of its continued potability.There are two basic and practiced methods for the protection of potable water supplies:a) Prot
7、ection by ContainmentThe isolation, by suitable devices or means, of the system within the premises supplied, wherein may lie the source or sources of contamination, from the vendors or public water supply system.b) Protection of Each Individual OutletThe protection of each individual outlet by suit
8、able devices or means, which within the premises served may be a source of contamination.Protection 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
9、occur due to backpressure conditions. In some, the pollutants that would get into the water supply would be undesirable, yet not be a hazard to the health of persons consuming the water.This standard covers two (2) types of devices, which are identified as Double Check Backflow Prevention Assemblies
10、 (DC) and Double Check Fire Protection Backflow Prevention Assemblies (DCF). The DC and the DCF are identical in their backflow protection. The DCF, which was added to this standard in 1999, has specific performance requirements relating to their use on fire protection systems.The devices described
11、are suitable for either protection by containment or protection of individual outlets where pollutants, which could be caused to enter the potable water, are low hazard.These devices are suitable for either hot or cold water service under continuous or intermittent pressure conditions.iv Double Chec
12、k Backflow Prevention Assemblies and Double Check Fire Protection Backflow Prevention AssembliesASSE 1015-2011Although many of the material specifications are detailed within Section 4.1 of this standard, it is the responsibility of the manufacturer and the installer to comply with the relevant juri
13、sdictional requirements.The working group, which developed this standard revision, was set up within the framework of the Product Standards Committee of ASSE International.Recognition is made of the time volunteered by members of this working group and of the support of the manufacturers who partici
14、pated in 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 qualified and
15、 trained professionals.This standard was promulgated in accordance with procedures developed by the American National Standards Institute (ANSI).This edition was approved by the ASSE Board of Directors on August 9, 2011 as an ASSE standard.Double Check Backflow Prevention Assemblies and v Double Che
16、ck Fire Protection Backflow Prevention AssembliesASSE 1015-2011Joseph FugeloProduct Standards Committee ChairmanLabov Co.Philadelphia, PennsylvaniaRand AckroydRand Technical Consulting, LLCNewburyport, MassachusettsWilliam Briggs Jr.MGJ AssociatesNew York, New YorkMaribel CamposICC Evaluation Servic
17、esWhittier, CaliforniaJudson CollinsJulyco ProfessionalsMannford, OklahomaRon GeorgePlumb-Tech Design and(b) Double Check Fire Protection Backflow Prevention Assembly (DCF). These assemblies consist of two (2) independently acting check valves, internally force loaded to a normally closed position,
18、two (2) properly located, tightly closing shut-off valves, per Section 1.3.2.6, and properly located test cocks, per Section 1.3.2.4. These assemblies are designed and constructed to operate under intermittent or continuous pressure conditions.This standard also applies to Manifold Double Check Back
19、flow Prevention Assemblies consisting of two (2) or more complete Double Check Backflow Prevention Assemblies in parallel. The assemblies do not need to be of the same pipe size. The manifold size shall be identified by the single inlet and outlet of the manifold assembly. Manifold Double Check Back
20、flow Prevention Assemblies shall include line-sized shut-off valves on each inlet and outlet of the assemblies making up the manifold.1.2.2 Size RangeConnection pipe sizes shall be in accordance with Table 1.2 Double Check Backflow Prevention Assemblies and Double Check Fire Protection Backflow Prev
21、ention AssembliesASSE 1015-2011Table 1Rated Water Flow and Maximum Allowable Pressure Loss for Various SizesSize of DeviceRated FlowDC MaximumAllowable PressureLoss at Rated FlowDCF MaximumAllowable PressureLoss at Rated FlowNPSDNGPML/spsikPapsikPainchmm 1 1 1 2 2 3 4 6 8 10 12 14 16 8 10 15 18 20 2
22、5 32 40 50 65 80 100 150 200 250 300 350 400 1.00 3.00 7.50 20.00 30.00 50.00 75.00 100.00 160.00 225.00 320.00 500.00 1000.00 1600.00 2300.00 3000.00 3700.00 4400.00 0.06 0.19 0.47 1.26 1.89 3.15 4.73 6.31 10.09 14.20 20.19 31.55 63.09 100.94 145.11 189.27 233.43 277.60 10.0 10.0 10.0 10.0 10.0 10.
23、0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.9 - - - - 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 - - - - 52.2 52.2 52.2 52.2 52.2 52.2 52.2 52.2 52.2 52.2 52.2 52.2 52.2 52.2 1.2.3
24、Rated Pressure1.2.3.1 A DC assembly shall be designed for a working pressure of at least 150.0 psi (1034.2 kPa).1.2.3.2 A DCF assembly shall be designed for a working pressure of at least 175.0 psi (1206.6 kPa).Double Check Backflow Prevention Assemblies and 3 Double Check Fire Protection Backflow P
25、revention AssembliesASSE 1015-20111.2.4 Temperature RangeThe assemblies shall be designed for a minimum temperature range of 33.0F to 140.0F (0.6C to 60.0C).1.3 Limitations on Design1.3.1 Structural StrengthAll parts of the assembly shall be designed to withstand, without permanent distortion, the s
26、tresses developed 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 Function1.3.2.1 Female Pipe Threaded ConnectionsFemale pipe threaded connections sh
27、all be tapped into bosses in the body and shall be so constructed that it will not be possible to run a pipe into them far enough to restrict the flow through the assembly or interfere with working parts.1.3.2.2 Repairability(a) The internal parts of the assembly shall be accessible for inspection,
28、repairs or replacements. The design shall permit this servicing without removing the assembly from the line, using the shut-off valves to isolate the assembly.(b) All replacement parts of the assemblies of the same size and model shall be interchangeable with the original parts.(c) Seats shall be re
29、placeable.1.3.2.3 Delivery InstructionsAll assemblies shall be delivered for installation with the shut-off valves attached. 1.3.2.4 Test Cock LocationTest cocks shall be provided in the following locations:(a) On the supply side of the inlet shut-off (not required on any sizes of DCF assemblies).(b
30、) Between the inlet shut-off valve and the first check. (c) Between the checks. (d) Between the second check and the outlet shut-off valve.1.3.2.5 Test Cock Size Inlet and Outlet ConnectionFor assemblies up to and including 1 inch (25 mm) pipe size, a minimum inlet and outlet thread on the test cock
31、s shall be NPT or SAE J513 . For assemblies 1 inch 2 inch (32 mm 50 mm), a minimum inlet and outlet thread on the test cocks shall be NPT. For assemblies 2 inch 4 inch (65 mm 100 mm), a minimum inlet and outlet thread on the test cocks shall be NPT. For assemblies 6 inch (150 mm) and larger, a minim
32、um inlet and outlet thread on the test cocks shall be NPT. Test cock waterways shall be full port. Protective caps shall be provided on SAE test cocks to protect male outlet threads. 1.3.2.6 Shut-off Valvesa) Shut-off valves shall be provided at the inlet and outlet of the assembly.b) Shut-off valve
33、s shall be resilient seated.c) For type DCF assemblies, the shut-off valves shall be UL or FM listed or approved for use in fire protection systems.(d) The #1 shut-off is located at the inlet side of the assembly.(e) The #2 shut-off is located at the outlet side of the assembly.4 Double Check Backfl
34、ow Prevention Assemblies and Double Check Fire Protection Backflow Prevention AssembliesASSE 1015-20111.4 Reference Standards ASME B16.24-2006, Cast Copper Alloy Pipe Flanges and Flanged Fittings: Classes 150, 300, 400, 600, 900, 1500 and 2500 ASME B1.20.1-1983 (R2006), Pipe Threads, General Purpose
35、 (Inch) ASME B1.20.3-1976 (R2008), Dryseal Pipe Threads (Inch) ASME MFC-14M-2003 (R2008), Measurement of Fluid Flow Using Small Bore Precision Orifice Meters ASSE Standard #1060-2006, Performance Requirements for Outdoor Enclosures for Fluid Conveying Components ASSE Standard Series 5000-2009, Cross
36、 Connection Control Professional Qualification Standard ASTM A 126-04 (2009), Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings ASTM A 536-84 (2009), Standard Specification for Ductile Iron Castings AWWA C606-06, Grooved and Shouldered Joints CFR Title 21, Section
37、177, Food and Drugs: Indirect Food Additives: Polymers ISA 75.02.01-2008, Control Valve Capacity Test Procedures SAE J513-1999, Refrigeration Tube Fittings General Specifications University of Southern California Foundation for Cross Connection Control and(b) 3.5, Allowable Pressure Loss at Rated Fl
38、ow. If the orientation of either of the checks changes from the primary to an alternate orientation, the assembly shall also be tested to all of the following sections: (a) 3.4, Hydrostatic Backpressure Test of Checks; (b) 3.6, Drip Tightness of First Check; and(c) 3.7, Drip Tightness of the Second
39、Check.2.2 Samples TestedThe testing agency shall select one (1) of each type and model and size for the full test.2.3 DrawingsAssembly and installation drawings and any other data which are needed to enable a testing agency to determine compliance with this standard shall accompany assemblies when s
40、ubmitted for examination and performance testing under this standard.2.4 RejectionFailure of one (1) assembly shall result in a rejection of that type and model and size.2.5 Manifold AssemblyA manifold assembly shall be tested per Sections 3.2, Hydrostatic Test of Complete Assembly, and 3.5, Allowab
41、le Pressure Loss at Rated Flow. The individual assemblies that make up the manifold shall meet all of the test sections of the standard in their intended orientation based on the nominal pipe size for each individual assembly.Double Check Backflow Prevention Assemblies and 7 Double Check Fire Protec
42、tion Backflow Prevention AssembliesASSE 1015-2011Section III3.0 Performance Requirements and Compliance TestingNOTE: A failure due to dirt or debris is not cause for rejection. It is permissible to clean, but not to replace fouled discs or seats during any test.3.1 Independence of Components3.1.1 Pu
43、rposeThe purpose of this test is to determine that the shut-off valves and checks operate without interfering with each other.3.1.2 ProcedureVerify that the shut-off valves and checks do not interfere with one another through their full range of travel.3.1.3 CriteriaAny interference of one (1) compo
44、nent with another component shall result in a rejection of the assembly.3.2 Hydrostatic Test of Complete Assembly3.2.1 PurposeThe purpose of this test is to determine if the assembly withstands pressures of two (2) times the manufacturers maximum rated pressure without leakage or damage to the assem
45、bly.3.2.2 ProcedureSeal the inlet and the outlet of the assembly. Pressurize the assembly through test cock #1 or #2 and hold a pressure of two (2) times the manufacturers maximum rated pressure for ten (10) minutes. The assemblys shut-off valves shall be in the full open position.8 Double Check Bac
46、kflow Prevention Assemblies and Double Check Fire Protection Backflow Prevention AssembliesASSE 1015-2011Figure 1Test SetupTest Valve #1 Flow Meter (Location Optional) Gauge Connection #1 Gauge Connection #2Test Valve #3 Flow Meter Test Valve #4Test Valve #2NOTES:1. Gauge connections #1 then gradual
47、ly increase the flow of water through the assembly until the required rated flow of water is achieved, per Table 1. Gradually decrease the flow of water to zero (0).3.5.2.2 DCF AssembliesInstall the assembly per Figure 1 with a manometer or differential pressure gauge at gauge connections #1 and #2.
48、 These shall connect to ring piezometers per ISA 75.02. The supply source shall be capable of supplying a volume of water adequate to meet the flow requirements of the size of assembly on test and maintain an inlet pressure of at least 10.0 psi (68.9 kPa) greater than the allowable pressure loss at
49、rated flow. The pressure loss through the piping between the shut-off valves of the assembly on test and the gauges at gauge connections #1 and #2 shall be subtracted from the differential pressure reading at gauge connections #1 and #2. Purge the system of air. The pressure loss at flow shall be measured at increments of 5.00 GPM (0.32 L/s), starting at zero (0) flow up to 50.00 GPM (3.15 L/s). Gradually increase the flow of water through the assembly until the required rated flow of water is achieved, per Table 1. Incre
