(a) The type of protection required under 943.06 (a), (b) and (c) of these rules and regulations shall depend on the degree of hazard which exists as follows:
(1) An approved air gap separation shall be installed where the public water system may be contaminated with substances that could cause a severe health hazard;
(2) An approved air gap separation or an approved reduced pressure principle backflow prevention assembly or an approved reduced pressure detector check assembly shall be installed where a public water system may be contaminated with any substance that could cause a system or health hazard;
(3) An approved air gap separation, an approved reduced pressure principle backflow prevention assembly, an approved double check valve assembly or an approved double check-detector check valve assembly shall be installed where a public water system may be contaminated with any substances that could cause a pollutional hazard.
(b) The type of protection required under 943.06(d) of these rules and regulations shall be an approved air gap separation or an approved interchangeable connection.
(c) Where an auxiliary water system is used as a secondary source of water for a fire protection system, the provisions of 943.07 (b) for an approved air gap separation or an approved interchangeable connection may not be required, provided:
(1) At premises where the auxiliary water system may be contaminated with substances that could cause a system or health hazard, or that contains additives (including food grade additives), the public water system or consumer's water system shall be protected against backflow by installation of an approved reduced pressure principle backflow prevention assembly (ASSE 1013 or 1047);
(2) At all other premises, where the hazard would not be greater than a pollution hazard, and contains no additives, the public water system or a consumer's water system shall be protected against backflow by installation of an approved reduced pressure principle backflow prevention assembly (ASSE 1013 or 1047), or an approved double check valve assembly (ASSE 1015 or 1048);
(3) The public water system shall be the primary source of water for the fire protection system;
(4) The fire protection system shall be normally filled with water from the public water system;
(5) The water in the fire protection system shall be used for fire protection only, with no other use of water from the fire protection system downstream from the approved backflow prevention assembly.
(6) Ethylene glycol shall not be permitted in a fire protection system.
(d) For a fire system that is not using an auxiliary water supply:
(1) An approved double check valve assembly (ASSE 1015 or 1048) will be required. This assembly shall be installed immediately downstream of the main line valve inside the building.
(2) An approved reduced pressure principle assembly (ASSE 1013 or 1047) is required on the water supply line serving a fire system containing any additive, including propylene glycol, or which can be connected to an auxiliary water system.
(3) Where one service line provides both fire protection and domestic service to the building, two separate backflow devices will be required. The domestic service shall branch off upstream of the approved fire protection backflow assembly and shall be protected by a backflow prevention assembly approved by Water Services Superintendent.
(4) Where a backflow prevention assembly is installed within a fire protection system, all tests and overhauls shall be made by a Department of Commerce certified tester who is also certified by the State Fire Marshal to test fire protection backflow assemblies.
(Ord. 17-169. Passed 9-11-17.)
(Ord. 17-169. Passed 9-11-17.)