1、Performance Requirements for Backflow Preventers with Integral Pressure Reducing Boiler Feed Valve and Intermediate Atmospheric Vent Style for Domestic and Light Commercial Water Distribution SystemsASSE InternationalASSE Standard #1081-2014ASSE Board Approved: December 2014ANSI Approved: January 20
2、15An American National StandardBackflow Preventers with Integral Pressure Reducing Boiler Feed Valve and Intermediate iAtmospheric Vent Style for Domestic and Light Commercial Water Distribution Systems ASSE Standard #1081-2014ASSE InternationalMokena, IllinoisCopyright 2014All rights reserved.Neith
3、er this standard, nor any portion thereof, may be reproduced without the written consent of ASSE International.No product may be said to be listed by ASSE unless the manufacturer has applied to ASSE International, has had its product tested according to the applicable 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 the ASSE International office. Organizations wishing to adopt or list any ASSE standard should 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.General Informationii Backflow Preventers with Integral Pressure Reducing Boiler Feed Valve and Intermediate Atmospheric Vent Style for Domestic and Light Commercial Water Distribution Systems ASSE Standard #1081-2014This foreword
6、 shall 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 ASSE International Product Standards Committee encourages manufacturers to participate in the development of performance requ
7、irement standards and testing procedures for their products. These standards have the consensus of manufacturers and others who have pertinent interests in plumbing systems and are acceptable to this organization.This standard was developed to provide performance standards and testing procedures for
8、 a pressure reducing boiler feed valve that offers protection of potable water within a premises by means of an integral backflow preventer with intermediate atmospheric vent. Serious contamination of the potable water supply within a premises can be hazardous to the health of occupants therein unle
9、ss every potentially offending outlet is protected. Within every occupancy there are piped systems fed by potable water inlets that could potentially cause backflow and be sources of contamination. The devices covered by this standard are designed to reduce and maintain a preset pressure at the boil
10、er inlet and give protection against low hazard backflow resulting from backpressure and/or back-siphonage at the potable water inlet or boiler feed location. They are not designed, nor intended, for building-isolation or high hazard conditions, which could find full protection only by the reduced p
11、ressure backflow preventer. These devices are fill valves intended for maintaining a minimum pressure in closed systems. Due to the fact that the devices are fill valves, and that the proximity of the two sets of valve internals affect pressure drops across the device, consideration is not given to
12、maintaining strict requirements for minimum flow capacity. The devices are used for maintaining a set pressure and for backflow prevention by way of intermittent flow only. They are not free flowing pressure reducers; therefore, flow capacity is of little significance other than for purposes of comp
13、arison. Measurement and published flow capacity will not be addressed as a functional requirement and, if published, will be the responsibility of the manufacturer. It is assumed that the potable water feeding the boiler line through the device will be at a temperature consistent with the requiremen
14、ts of local codes and will not reach the upper limits of the device (Section 1.2.4). The exhaust of the device will experience an elevated temperature due to the heat from the circulating water in the boiler system. The device will cool once flow begins in order to maintain the set pressure. The tem
15、perature performance requirements of Section 3.14 are written with this use case in mind.Testing procedures and test equipment diagrams have been added to this standard to enable uniform testing by certified testing agencies with adequate facilities and qualified personnel. The testing methods and e
16、quipment required are intended to reflect the requirements and intent of the standards listed below. The intent of this standard is to clarify the interdependent performance characteristics of two separate devices, now in close proximity in one housing. If the devices were not in close proximity, th
17、ey would be independently governed by: ASSE 1003-2009, Performance Requirements for Water Pressure Reducing Valves for Domestic Water Distribution Systems ASSE 1012-2009, Performance Requirements for Backflow Preventers with an Intermediate Atmospheric VentForewordBackflow Preventers with Integral P
18、ressure Reducing Boiler Feed Valve and Intermediate iiiAtmospheric Vent Style for Domestic and Light Commercial Water Distribution Systems ASSE Standard #1081-2014ASSE 1081-2014, Performance Requirements for Backflow Preventers with Integral Pressure Reducing Boiler Feed Valve and Intermediate Atmos
19、pheric Vent Style for Domestic and Light Commercial Water Distribution Systems, must be reviewed periodically and upgraded as research, field conditions and experience suggest. The policy of ASSE International is to review each standard on a five-year cycle for revisions or reaffirmation. Although m
20、any of the material specifications are detailed within Section IV 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 93-523, if and when the product is intended to be installed in potable water servi
21、ce lines. The intent of the standard, however, is to provide performance standards for boiler feed and not intended for potable water service.The ASSE 1081 working group, which developed this standard, was set up within the framework of the ASSE International Product Standards Committee.Recognition
22、is made of the time volunteered by members of this working group and of the support of manufacturers, who also participated in meetings for this standard.This standard does not imply ASSE Internationals endorsement of a product that conforms to these requirements. Compliance with this standard does
23、not imply acceptance by any code body.It 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 National Standards Institute (ANSI).This edition of the s
24、tandard was approved by the ASSE International Board of Directors on Dec. 19, 2014 as an ASSE standard.iv Backflow Preventers with Integral Pressure Reducing Boiler Feed Valve and Intermediate Atmospheric Vent Style for Domestic and Light Commercial Water Distribution Systems ASSE Standard #1081-201
25、4Edward J. Lyczko, ChairpersonCleveland Clinic Retiree Cleveland, OHWilliam Briggs Jr.MGJ AssociatesNew York, NYTerry BurgerCSA GroupIndependence, OHMaribel CamposICC Evaluation ServicesWhittier, CAWilliam ChapinProfessional Code Consulting, LLCCullman, ALRon GeorgePlumb-Tech Design reference Table
26、3. Failure of the reduced downstream pressure to match the manufacturers published data within 10% shall result in a rejection of the device.Table 3Reference of Maximum Downstream Pressure Deviation Given the Supply PressureSupply PressureMaximum Deviation From the Downstream Pressure of 35 psi (240
27、 kPa) or 50% of the Manufacturers Maximum Downstream Pressure, Whichever is Lesspsi (kPa) psi (kPa)50.0 (345) (0)80.0 (552) 3.0 (21)150.0 (1034) 10.0 (68.9)Backflow Preventers with Integral Pressure Reducing Boiler Feed Valve and Intermediate 9Atmospheric Vent Style for Domestic and Light Commercial
28、 Water Distribution Systems ASSE Standard #1081-20143.10 Reduced Pressure Adjustment Range Test3.10.1 PurposeThe purpose of this test is to verify the manufacturers stated adjustment range. 3.10.2 ProcedureInstall the device into the test fixture per Figure 1. Fill the fixture and purge the system o
29、f air. Close shut-off valves 3, 4, 7, 8, 10, the bleed valve (11) and the discharge valve (12). Maintain the supply pressure at 80.0 psi (552 kPa). Open the bleed valve and bleed through the 16 inch (1.6 mm) orifice. Adjust the device to deliver its maximum and minimum reduced pressure.3.10.3 Criter
30、iaFailure of the device to maintain minimum and maximum outlet pressures to within 3.0 psi (21 kPa) of the manufacturers stated adjustment range shall result in a rejection of the device.3.11 Backflow Through the Upstream Check3.11.1 PurposeThe purpose of this test is to determine if water can flow
31、back into the water supply system when the vent port outlet is sealed closed, the downstream check is removed and the maximum rated working pressure is applied to the outlet of the device.3.11.2 ProcedureBy suitable means, hold the downstream check valve in a partially open position and seal the ven
32、t outlet closed. Install the device per Figure 2 with the reservoir filled with colored water. Gradually raise the pressure at the outlet of the reservoir until the pressure equals 6.0 inch (152 mm) water column, measured from the center of the pipe line (horizontal mounting) or the center of the di
33、sc face (vertical mounting). Hold for 5 minutes. Observe for the appearance of colored water in the inlet of the device. Repeat with a pressure of 15.0 psi (103 kPa) and then with a pressure equal to the manufacturers maximum rated working pressure of the device. 10 Backflow Preventers with Integral
34、 Pressure Reducing Boiler Feed Valve and Intermediate Atmospheric Vent Style for Domestic and Light Commercial Water Distribution Systems ASSE Standard #1081-2014Figure 2DeviceBeakerBeakerFigure 2132Sight glassReservoir Pressure gauge3.11.3 CriteriaAny backflow of water into the inlet of the device
35、during testing shall result in a rejection of the device.3.12 Back-Siphonage3.12.1 PurposeThe purpose of this test is to determine if back-siphonage occurs from the downstream piping into the supply line when both check valves are fouled, creating a vacuum in the inlet of the device, and the downstr
36、eam pressure is atmospheric.3.12.2 ProcedureThe upstream check valve shall be fouled with an appropriate size fouling wire, as shown in Table 4, in the location for the type of valve construction, and the downstream check valve shall be held open by mechanical means. The device shall be installed pe
37、r Figure 3 with shut-off valve 1, the solenoid valve and the downstream sight glass needle valve open. Shut-off valves 2 and 3 shall be closed. Test equipment shall be capable of developing a vacuum of at least 25.0 inches (635 mm) mercury column. Tests shall be conducted in sequence as follows:a. A
38、pply and hold a vacuum of 25.0 inches (635 mm) mercury column at the inlet for not less than 1 minute. Return to 0.0 inches (0 mm) mercury column.b. Slowly raise the vacuum from 0.0 to 25.0 inches (0 to 635 mm) mercury column and then slowly reduce it from 25.0 to 0.0 inches (635 to 0 mm) mercury co
39、lumn.c. By means of the upstream solenoid valve, create a surge effect by quickly opening and closing the valve. During this test, the vacuum must range between 25.0 to 0.0 inches (635 to 0 mm) mercury column.Backflow Preventers with Integral Pressure Reducing Boiler Feed Valve and Intermediate 11At
40、mospheric Vent Style for Domestic and Light Commercial Water Distribution Systems ASSE Standard #1081-2014Figure 3DeviceFigure 3Pneumatic flow directionOpen-close selenoid valve132Vacuum regulatorVacuum pump Pressure gauge Sight glassFlow control valve (needle valve)Table 4Nominal Pipe Size Fouling
41、Wire DiameterNPS DN inches mm 15 0.032 0.81 20 0.039 1.00Style 1Poppet Nozzle BodyStyle 2Swing Check Style 3Poppet Flat/Level Seat12 Backflow Preventers with Integral Pressure Reducing Boiler Feed Valve and Intermediate Atmospheric Vent Style for Domestic and Light Commercial Water Distribution Syst
42、ems ASSE Standard #1081-20143.12.3 CriteriaAny rise in the water level of the sight glass shall result in a rejection of the device. The sight glass shall be 1.0 inch (25.4 mm) minimum diameter. In any test in which there is an upward bowing of the meniscus of water in the sight glass, the crown of
43、the meniscus shall not exceed a rise of 0.13 inches (3.2 mm) above the level of water in the reservoir or basin.3.13 Back-Siphonage Backpressure3.13.1 PurposeThe purpose of this test is to determine that back-siphonage from the downstream piping into the supply line shall not occur if one check beco
44、mes fouled and a vacuum is created in the inlet of the device when there is a positive pressure on the outlet.3.13.2 ProcedureThe upstream check valve shall be fouled with an appropriate size fouling wire, as shown in Table 4, in the location for the type of valve construction. The device shall be i
45、nstalled per Figure 3 with the solenoid valve and shut-off valves 1 and 2 open. The upstream and downstream needle valves, and shut-off valve 3 shall be closed. Use colored water in the pressurized line connected to the outlet of the device. Run the test with a backpressure of 15.0 psi (103 kPa) and
46、 again with a backpressure of 50.0 psi (345 kPa). Test equipment shall be capable of developing a vacuum of at least 25.0 inches (635 mm) mercury column. a) Apply and hold a vacuum of 25.0 inches (635 mm) mercury column at the inlet for not less than 1 minute. Return to 0.0 inches (0 mm) mercury col
47、umn.b) Slowly raise the vacuum from 0.0 to 25.0 inches (0 to 635 mm) mercury column and then slowly reduce it from 25.0 to 0.0 inches (635 to 0 mm) mercury column.c) By means of the upstream solenoid valve, create a surge effect by quickly opening and closing the valve. During this test, the vacuum
48、must range between 25.0 to 0.0 inches (635 to 0 mm) mercury column.d) Within 5 seconds of step c, close the solenoid valve, open the upstream needle valve and drain the upstream fluid between the device on test and shut-off valve 2 into the beaker. e) Repeat the test with the downstream check valve
49、fouled, as above, and the upstream check valve in its normal closed position.3.13.3 CriteriaAny back-siphonage of water from the downstream piping into the supply line shall result in a rejection of the device. Any indication of flow of colored water into the inlet piping shall result in a rejection of the device.3.14 Deterioration at Extremes of Manufacturers Temperature Range3.14.1 PurposeThe purpose of this test is to verify that when exposed to water at extremes of the manufacturers rated temperature and its maximum rated pressure, the assembly continues to meet th
