1、Freeze Resistant Sanitary Yard Hydrants with Backflow Protection 1ASSE 1057-2012Performance Requirements forFreeze Resistant Sanitary Yard Hydrants with Backflow ProtectionAmerican Society of Sanitary EngineeringASSE Standard #1057-2012ASSE Board Approved: July, 2012ANSI Approved: August, 2012An Ame
2、rican National StandardFreeze Resistant Sanitary Yard Hydrants with Backflow Protection iASSE 1057-2012General InformationNeither 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 li
3、sted unless the manufacturer has applied to ASSE, has had its product tested according to the applicable standards, the product has passed the test and displays the ASSE Seal on the product.Instructions for receiving authorization to display the ASSE Seal are available from ASSEs International Offic
4、e. 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.American Society of Sanitary EngineeringWestlake, OhioCopyright 2012, 2001, 1993All rights reserved.ii
5、 Freeze Resistant Sanitary Yard Hydrants with Backflow ProtectionASSE 1057-2012Freeze Resistant Sanitary Yard Hydrants with Backflow Protection iiiASSE 1057-2012ForewordThis foreword is not considered a part of the standard. However, it is offered to provide background information.It is currently re
6、cognized that the common garden or utility hose, when connected to a potable water supply by means of a hose threaded outlet, constitutes a potential cross-connection. It is also currently recognized that the same cross-connection may exist when a potable water supply is permitted to drain undergrou
7、nd.With specific reference to Freeze Resistant Sanitary Yard Hydrants, this standard has been developed to protect the potable water supply from backflow contamination and ground water contamination.It has been recognized that five types of yard hydrants need to be considered to protect against free
8、zing. The types considered are: Type 1, which provides protection with two check valves and an atmospheric vent and does not require removal of the hose to provide freeze protection; Type 2, which provides protection with two check valves and an atmospheric vent and requires removal of the hose to p
9、rovide freeze protection; Type 3, which provides protection with one check valve and an atmospheric vent and does not require removal of the hose to provide freeze protection; Type 4, which provides protection with one check valve and an atmospheric vent and requires removal of the hose to provide f
10、reeze protection; and Type 5, which has an air gap or removable backflow protection device and requires removal of the backflow protection device and hose to provide freeze protection.Although many of the material specifications are detailed within Section 4.1 of this standard, it is the responsibil
11、ity of the manufacturer and installer to comply with the relevant jurisdictional requirements.The working group, which developed this standard revision, was set up within the framework of the Product Standards Committee of the American Society of Sanitary Engineering.Recognition is made of the time
12、volunteered by members of this working group and of the support of the manufacturers who also participated in the meetings for this standard.The standard does not imply ASSEs endorsement of a product which conforms to these requirements.Compliance with this standard does not imply acceptance by any
13、code body.iv Freeze Resistant Sanitary Yard Hydrants with Backflow ProtectionASSE 1057-2012It is recommended that these devices be installed consistent with local codes by qualified and trained professionals.This standard was promulgated in accordance with procedures developed by the American Nation
14、al Standards Institute (ANSI).This edition was approved by the ASSE Board of Directors on July 2, 2012 as an ASSE standard.Freeze Resistant Sanitary Yard Hydrants with Backflow Protection vASSE 1057-2012Joseph Fugelo, ChairmanLabov Co.Philadelphia, PennsylvaniaRand AckroydRand Technical Consulting,
15、LLCNewburyport, MassachusettsWilliam Briggs Jr.MGJ AssociatesNew York, New YorkMaribel CamposICC Evaluation ServicesWhittier, CaliforniaJudson CollinsJULYCOMannford, OklahomaRon GeorgePlumb-Tech Design (2) Raise the vacuum slowly from 0.0 inches (0.0 mm) to 25.0 inches (635.0 mm) of mercury and then
16、 slowly reduce it to 0.0 inches (0.0 mm) of mercury; and(3) Create a surge effect by opening and closing a quick acting valve. The applied vacuum shall vary between 0.0 inches (0.0 mm) to 25.0 inches (635.0 mm) of mercury during the test.10 Freeze Resistant Sanitary Yard Hydrants with Backflow Prote
17、ctionASSE 1057-2012Figure 7Vacuum PumpVacuum TankGaugeShut-offValveQuick Acting ValveVacuum RegulatorDevice on TestSight Glass ScaleReservoir3.9.3 CriteriaA rise of water in the sight glass, including a bowing of the meniscus, exceeding a rise of 3.0 inches (76.2 mm) above the water in the reservoir
18、 shall result in a rejection of the device. 3.10 Backsiphonage and Backpressure (Types 1 and 2) 3.10.1 PurposeThe purpose of this test is to ensure that the backflow prevention device prevents backflow due to backsiphonage.3.10.2 ProcedureThe inlet check valve shall be fouled with a 0.032 inch (0.81
19、3 mm) diameter fouling wire (see Appendix A for fouling wire examples). The outlet check valve shall be in its normal closed position. Install the device as shown in Figure 8 and open the supply valve to maintain 3.0 psi (20.7 kPa) at the outlet of the device. The following vacuum loads shall be app
20、lied in sequence:(1) Apply and hold a vacuum of 25.0 inches (635.0 mm) of mercury for five (5) minutes;(2) Raise the vacuum slowly from 0.0 inches (0.0 mm) to 25.0 inches (635.0 mm) of mercury and then slowly reduce it to 0.0 inches (0.0 mm) of mercury; and (3) Create a surge effect by opening and c
21、losing a quick acting valve. The applied vacuum shall vary between 0.0 inches (0.0 mm) to 25.0 inches (635.0 mm) of mercury during the test.Repeat the test with the outlet check valve fouled with a 0.032 inch (0.813 mm) diameter fouling wire (see Appendix A for fouling wire examples). The inlet chec
22、k valve shall be in its normal closed position.Freeze Resistant Sanitary Yard Hydrants with Backflow Protection 11ASSE 1057-2012Figure 8 PrimarySupplyGaugeRingPiezometerInletVacuumsystem similarto Figure 7OutletDevice on TestSupplyValveSight Glass3.10.3 CriteriaAny indication of flow of water from t
23、he outlet of the device into the inlet piping shall result in a rejection of the device.3.11 Relief of Intermediate Chamber Pressure (Types 1 and 2) 3.11.1 PurposeThe purpose of this test is to determine if the intermediate chamber pressure will be relieved when the device is pressurized to 100.0 ps
24、i (689.5 kPa) or the manufacturers maximum rated working pressure, whichever is greater, and the inlet pressure suddenly drops to 0.0 psi (0.0 kPa).3.11.2 ProcedureInstall the device as shown in Figure 5. Open Valve #1 and Valve #2 and flow water through the device to purge it of air. Close Valve #2
25、 and raise the pressure to 100.0 psi (689.5 kPa) or the manufacturers maximum rated working pressure, whichever is greater. Close Valve #1. Open the quick acting valve to drop the pressure at the inlet of the device to atmospheric pressure. The pressure in the intermediate chamber shall be dissipate
26、d quickly, as indicated by the discharge of water through the atmospheric vents.3.11.3 CriteriaFailure of the atmospheric vents to open and dissipate pressure in the intermediate chamber shall result in a rejection of the device.3.12 Backflow Prevention (Types 3, 4 and 5)3.12.1 PurposeThe purpose of
27、 this test is to determine if the atmospheric vent opening relieves the outlet pressure when the supply pressure drops to 0.0 psi (0.0 kPa).3.12.2 ProcedureThe device shall be installed in a test system, as shown in Figure 9. The hose connected to the outlet of the device shall be 0.5 inch (12.7 mm)
28、 nominal inside diameter, 25.0 feet (7.6 m) in length and having a quick closing nozzle on its discharge end. Purge the test set-up of air and then pressurize the system to 100.0 psi (689.5 kPa) or the manufacturers maximum rated working pressure, whichever is greater, with water at ambient temperat
29、ure. The supply valve shall be closed and then a quick-acting valve shall be opened to drop the pressure in the inlet of the device to 0.0 psi (0.0 kPa). The pressure in the hose line shall be dissipated quickly by the discharge of water through the vent ports.12 Freeze Resistant Sanitary Yard Hydra
30、nts with Backflow ProtectionASSE 1057-2012Figure 9GaugeSnubberHoseNozzleDevice on TestShut-offValve Quick Acting Valve3.12.3 CriteriaFailure of the device to begin to relieve the outlet pressure through the vent port when the supply pressure reaches 0.0 psi (0.0 kPa) shall result in the rejection of
31、 the device.3.13 Backflow Preventer Attachment Requirements3.13.1 PurposeThe purpose of this test is to ensure that the manufacturer has provided a means of securing the mechanical backflow preventer or, where removable, shall provide a means to prohibit future hose connections.3.13.2 ProcedureAttem
32、pt to remove the mechanical backflow preventer by applying a torque of 180.0 in-lb (20.3 Nm) at the base of the mechanical backflow preventer. Mechanical backflow preventers which cannot be removed by this method shall be deemed non-removable. Where the mechanical backflow preventer is removed, the
33、remaining outlet shall have a minimum outside cross- sectional dimension of at least 1.0 inch (25.4 mm). Attempt to attach a garden hose with threaded connectors to the outlet of the device.3.13.3 CriteriaAny indication that the backflow preventer can be removed by applying a torque of less than 180
34、.0 in-lb (20.3 Nm) or, once removed, that a garden hose with threaded connectors can be reattached to the outlet shall result in a rejection of the device. 3.14 Flow Rates and Pressure Loss3.14.1 PurposeThe purpose of this test is to determine the pressure loss at rates of flow as identified per Tab
35、le 1.3.14.2 ProcedureThe device shall be installed in the open position in the test system, as shown in Figure 1, equipped with a means for accurately measuring the rate of ambient water flow and pressure loss across the device. Purge the system of air and close the throttling valve. The throttling
36、valve shall then be slowly opened until the 25.0 psi (172.4 kPa) pressure differential is reached.Freeze Resistant Sanitary Yard Hydrants with Backflow Protection 13ASSE 1057-2012Table 1Outlet of Device Minimum Flow Rate Maximum Allowable Pressure Loss NH GPM L/s psi kPa 4.00 0.25 25.0 172.4 1 8.00
37、0.50 25.0 172.4 3.14.3 CriteriaFailure of the device to meet the flow requirements of Table 1, at or below the maximum allowable pressure loss of 25.0 psi (172.4 kPa), shall result in a rejection of the device.14 Freeze Resistant Sanitary Yard Hydrants with Backflow ProtectionASSE 1057-2012Section I
38、V4.0 Detailed Requirements4.1 Materials4.1.1 Materials in Contact with WaterSolder and fluxes containing lead in excess of 0.2% shall not be used in contact with potable water.4.1.2 Corrosion ResistanceInternal moving parts shall be of a material having a corrosion resistance at least equal to an al
39、loy of not less the 58% copper.4.2 InstructionsInstructions shall accompany each device and shall provide all information, including illustrations, necessary for correct installation, operation, maintenance and repair of the device.4.3 Marking4.3.1 Each device shall have the following information ma
40、rked on it where it will be visible after the device has been installed:a) Name of manufacturer/marketer or trademark.b) Type and model number of the device.4.3.2 Markings shall be cast, etched, stamped or engraved on the body of the device or on a corrosion resistant material plate securely fastene
41、d to the device.Freeze Resistant Sanitary Yard Hydrants with Backflow Protection 15ASSE 1057-2012Section V5.0 DefinitionsDefinitions not found in this section are located in the Plumbing Dictionary, Sixth Edition, published by ASSE. 16 Freeze Resistant Sanitary Yard Hydrants with Backflow Protection
42、ASSE 1057-2012Appendix A(a) Slitted Disk (b) Bevel Seat (c) O-Ring Seat (d) Flat Disc & Seat(e) Swing Check (f) Poppet TypeNozzle Type Body(g) Poppet TypeFlat or level seat body(h)American Society of Sanitary Engineering901 Canterbury Road, Suite A Westlake, Ohio 44145Phone (440) 835-3040 Fax (440) 835-3488E-Mail general.infoasse-plumbing.org Web: www.asse-plumbing.org
