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(a) AVBs provide minimal protection and are approved for very low hazard application only. AVBs protect against backsiphonage only and are prohibited where there is potential for backpressure.
(b) The assembly shall be installed a minimum of six inches above the highest use outlet or overflow level downstream from the assembly.
(c) Shutoff valves downstream from the assembly are prohibited.
(d) AVBs shall be allowed only for those applications where there is less than 12 hours per day continuous use.
(e) AVBs shall not be installed in an area subject to flooding or where damage may occur from water discharge.
(f) AVBs shall be allowed for point-of-use protection only in accordance with the plumbing code. AVBs are not recognized as adequate protection by the director, so additional protection may be required.
Atmospheric Vacuum Breaker
Notes:
(1) No control valves or shutoffs allowed downstream.
(2) Install assembly at no more than 60 inches above ground level.
(3) Install assembly at least six inches above highest downstream use piping.
(4) No pumps or backpressure source allowed.
(5) No chemical addition into system allowed.
(Ord. 12274, § 1, passed 11-28-1995)
(a) Air gap separations provide maximum protection from backflow hazards and may be utilized at premises where a substance is handled that would be hazardous to health if introduced into the potable water system.
(b) An air gap separation shall be at least twice the diameter of the supply pipeline measured vertically above the top rim of the receiving vessel, in no case less than one inch. If splashing is a problem, tubular screens may be attached or the supply line may be cut at a 45 degree angle. The air gap distance is measured from the bottom of the angle. Hoses shall not be allowed.
(c) Air gap separations shall not be altered in any way without prior approval from the director, and shall be available for inspection at all reasonable times.
(d) Side walls, ribs or similar obstructions do not affect air gaps when spaced from the inside edge of the spout opening a distance greater than three times the diameter of the effective opening for a single or a distance greater than four times the effective opening for two intersecting walls.
(e) In cases where there are three or more side walls, ribs or similar obstructions extending from the water surface to or above the horizontal plane of the spout opening other than as specified in subsection (d) above, the air gap shall be measured from the top of the wall.
(f) The effective opening shall be the minimum cross-sectional area at the seat of the control valve or the supply pipe or tubing which feeds the assembly or outlet. If two or more lines supply one outlet, the effective opening shall be the sum of the cross-sectional areas of the individual supply lines or the area of the single outlet, whichever is smaller.
Air Gap Separation
Notes:
(1) Provides maximum protection.
(2) The vertical, physical separations must be at least twice the diameter of the inlet pipe but never less than one inch.
(Ord. 12274, § 1, passed 11-28-1995)
An approved double-check valve assembly shall be the minimum protection for fire sprinkler systems using piping material that is not approved for potable water use and/or that does not provide for periodic flow-through during each 24-hour period, unless a variance has been issued in writing from the director. An RP assembly shall be installed if any solution other than the potable water can be introduced into the sprinkler system.
(Ord. 12274, § 1, passed 11-28-1995)
(a) Every person provided water service by the city directly or indirectly shall during the hours of 8:00 a.m. through 5:00 p.m. permit the director to enter their premises and buildings for the purpose of inspecting pipes and fixtures and the manner in which the water is used to determine compliance with this division.
(b) If any water user refuses access to a premises during said times for inspection by an inspector, the water user shall install a reduced pressure principle assembly at the service connection to that premises.
(c) Any temporary or permanent obstruction to safe and easy access to the premises to be inspected shall be promptly removed by the water user at the written or verbal request of the director and shall not be replaced. The costs of clearing such access shall be borne by the user.
(d) A person commits an offense if the person knowingly fails to install a reduced pressure principle assembly in accordance with this subsection (d) after receiving notice from the director to do so.
(Ord. 12274, § 1, passed 11-28-1995)
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