(A) The type of protection required under § 52.026 shall depend on the degrees of hazard which exist as follows:
(1) An approved proper air gap separation shall be installed where the public water supply system may be contaminated with substances that would cause a severe health hazard;
(2) An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention assembly shall be installed where the public water supply system may be contaminated with a substance that could cause a system or health hazard; and
(3) An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention assembly or a double check valve assembly shall be installed where the public water supply system may be polluted with substances that could cause a pollution hazard not dangerous to health.
(B) The type of protection required under § 52.026 shall be an approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention device.
(C) Where a public water supply or an auxiliary water supply is used for a fire protection system, reduced pressure principle backflow preventers shall be installed on fire safety systems connected to the public water supply when:
(1) The fire safety system contains antifreeze, fire retardant, or other chemicals;
(2) Water is pumped into the system from another source;
(3) Water flows by gravity from a non-potable source; or water can be pumped into the fire safety system from any other source; and
(4) There is a connection whereby another source can be introduced into the fire safety system.
(D) All other fire safety systems connected to the potable water supply shall be protected by a double check valve assembly on metered service lines and a double detector check valve assembly on unmetered service lines.
(Prior Code, § 52.13) (Ord. 91-5, passed 8-19-1991)