[Ord. 603, 2/10/1987, § 801]
1.
Any backflow prevention device required by this Part shall be of
a model or construction approved by the Borough and shall comply with
the following:
A.
Air gap separation to be approved shall be at least twice the diameter
of the supply pipe, measured vertically, above the top rim of the
vessel, but in no case less than one inch.
B.
A double check valve assembly or a reduced pressure zone backflow
prevention device shall be approved by the public water supplier and
shall mean a device that has been manufactured in full conformance
with standards established by the American Water Works Association
(AWWA) entitled "AWWA C506 Standards for Reduced Pressure Principle
and Double Cheek Valve Backflow Prevention Devices." Said AWWA standards
are herein adopted by the Borough. Final approval, however, of the
double check valve assembly shall be evidenced by a certificate of
full approval issued by an approved testing laboratory certifying
full compliance with the said AWWA standards.
C.
An interchangeable connection to be approved shall be either a swing-type
connector or a four-way valve of the lubricated plug type that operates
through a mechanism which unseats the plug, turns it 90° and reseats
the plug. Four-way valves shall not be used as stop valves but must
have separate stop valves on each pipe connected to the valve. The
telltale port on the four-way valve shall have no piping connected
and the threads or flange on this port shall be destroyed so that
a connection cannot be made.
[Ord. 603, 2/10/1987, § 802]
Existing backflow prevention devices approved by the Borough at the time of installation and properly maintained shall, except for inspection and maintenance requirements, be excluded from the requirement of § 26-436 of this regulation, provided that the Borough is assured that they will satisfactorily protect the public potable water system. Whenever the existing device is moved from the present location or requires more than minimum maintenance or when the Borough finds that the maintenance of the device constitutes a hazard to health, the device shall be replaced by a backflow prevention device meeting the requirements of these regulations.
