(a) PVBs may be utilized at point-of-use protection only and where a substance is handled that would be objectionable but not hazardous to health if introduced into the potable water system. PVBs protect against backsiphonage only and shall not be installed where there is potential for backpressure.
(b) The assembly shall be installed a minimum of 12 inches above the highest use outlet or overflow level downstream from the assembly.
(c) PVBs shall not be installed in an area subject to flooding or where damage would occur from water discharge.
(d) The assembly shall be protected from freezing.
(e) The assembly shall be readily accessible for testing and maintenance, with a minimum clearance of 12 inches all around the assembly.
(f) PVBs shall be located between 12 inches and 60 inches above ground level.
(g) A strainer with blowout tapping may be required ahead of the assembly.
(h) All PVBs must be tested in compliance with this division. Tests are the responsibility of the assembly owner. The owner shall notify the director upon installation of any backflow prevention assembly.
(i) Variances from these specifications will be evaluated on a case by case basis. No deviations shall be permitted without prior written approval of the director.
Pressure Vacuum Breaker
Notes:
(1) Downstream control valves or shutoffs are allowed.
(2) Install assembly at no more than 60 inches above ground level.
(3) Install assembly at least 12 inches above highest use outlet.
(4) No pumps or backpressure source allowed.
(5) No chemical addition into system allowed.
(6) Pressure vacuum breakers must be tested by a certified backflow prevention assembly tester upon installation and annually thereafter; also when moved or repaired.
(Ord. 12274, § 1, passed 11-28-1995)