Backflow Prevention Assemblies Sample Clauses

Backflow Prevention Assemblies. A. Approved Backflow Prevention Assemblies 1. Only backflow prevention assemblies which are listed on the "List of Approved Backflow Prevention Assemblies" published by the Foundation for Cross-Connection Control and Hydraulic Research, University of Southern California, and 2. Which meet the reduction of lead in drinking water act (42 U.S.C. 300G) requires that any valve, fitting, or fixture coming in contact with potable water must meet the requirement of having weighted average of lead content of less than 0.25 percent, shall be acceptable for installation by a water user connected to Missoula Water’s potable supply B. Existing Backflow Prevention Assemblies Approved backflow prevention assemblies that are currently in service shall be tested and if found to be in serviceable condition can be left in service after certain information (make, model, size, serial number, and test results) has been provided to Missoula Water. The assembly must then be tested yearly by a certified backflow prevention assembly tester (see Section VII) or more frequently if determined necessary by Missoula Water. Existing backflow prevention assemblies found to be unserviceable or whose application has been misapplied shall be removed and replaced with an appropriate assembly approved by Missoula Water. C. Backflow Prevention Assembly Installation Backflow prevention assemblies shall be installed in a manner prescribed by Missoula Water. Location of the assemblies should be as close as practical to the user's connection. Missoula Water shall have the final authority in determining the required location of a backflow prevention assembly. 1. Air-gap separation (AG) - The air gap separation shall be located on the user's side of and as close to the service connection as practical. All piping from the service connection to the receiving tank shall be above grade and be entirely visible. No water use shall be provided from any point between the service connection and the air-gap separation. The water inlet piping shall terminate a distance of at least two (2) pipe diameters above the supply inlet, but in no case be less than one (1) inch above the overflow rim of the receiving vessel. Properly installed, the air gap may be used to protect against all levels of backflow hazards. 2. Reduced pressure zone backflow prevention assembly (RP) - The approved reduced pressure zone backflow prevention assembly shall be installed on the user's side and as close to the service connection as pr...
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Backflow Prevention Assemblies. The double check assembly (DCA) valves and double check detector assembly (DCDA) valve shall be inspected quarterly to ensure that the OS&Y isolation valves are in the normal open position. Reduced pressure assemblies (RPA) and reduced pressure detector assemblies (RPDA) shall be inspected to ensure that the differential-sensing valve relief port is not continuously discharging and the OS&Y isolation valves are in the normal open position. Valves secured with locks or electrically supervised in accordance with applicable NFPA standards shall be inspected. Quarterly inspections are in addition to inspections provided by others at more frequent intervals.
Backflow Prevention Assemblies. All backflow preventers installed in fire protection system piping shall be tested annually in accordance with the following: a. A forward flow test shall be conducted at the system demand, including hose stream demand, where hydrants or inside hose stations are located downstream of the backflow preventer; and b. A backflow performance test, as required by the authority having jurisdiction, shall be conducted at the completion of the forward flow test. For backflow preventers sized 50.8 mm (2 in.) and under, the forward flow test shall be acceptable to conduct without measuring flow, where the test outlet is of a size to flow the system demand. Where water rationing shall be enforced during shortages lasting more than 1 year as advised in writing by the University’s Representative, an internal inspection of the backflow preventer to ensure the check valves will fully open shall be acceptable in lieu of conducting the annual forward flow test. Where connections do not permit a full flow test, tests shall be completed at the maximum flow rate possible. The forward flow test shall not be required where annual fire pump testing causes the system demand to flow through the backflow preventer device. All backflow devices installed in fire protection water supply shall be tested annually at the designed flow rate of the fire protection system, including required hose stream demands. Where connections do not permit a full flow test, tests shall be conducted at the maximum flow rate possible.

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