(A) The discharge pipe of an air gap shall terminate a minimum of two pipe diameters of the discharge pipe or six inches, whichever is the lesser, above the maximum record floor level or above the flood level rim of the receiving vessel, whichever is higher.
(B) Only those models or double check detector valve assembles, reduced pressure principle backflow preventers or pressure-type vacuum breakers approved by the town’s water utility are acceptable.
(C) Reduced pressure principle backflow preventers shall be installed horizontally, with no plug or additions; piping affixed to the pressure differential relief valve port, and with the pressure differential relief valve port a minimum of 12 inches above floor level. Additionally, the device must be installed at a location where any leakage from the pressure differential relief port will be noticed and such leakage collected in a scupper drain or floor drain that allows access to the device for maintenance and testing from floor level, and that will not subject the device to flooding, excessive heat, or freezing.
(D) All double check detector valve assemblies shall be installed horizontally at a location that allows access to the device for maintenance and testing from floor level and that will not subject the device to flooding, excessive heat, or freezing.
(E) Pressure-type vacuum breakers shall be installed as near as possible to the irrigation facility, at a location that allows access to the device for maintenance and testing from floor or ground-level and that will not subject the device to flooring, excessive heat, or freezing. Additionally, the device must be installed with its centerline or datum point a minimum of 12 inches above floor level; the highest downstream shut-off valve; and the highest downstream overflow rim or discharge point.
(Prior Code, § 9-162) (Res. 2012-1, passed 4-10-2012) Penalty, see § 52.999