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Cross connections
between water supplies and sources of contamination represent one of
the most significant threats to public health in the water supply
industry. A cross connection is any physical connection between two
separate piping systems, the water supply and another substance of
unknown quality. A backflow can occur when the unknown
substance flows back into the public water supply as water pressure
fluctuates. Backflows jeopardize the community’s quality of water
and can cause serious health hazards.
All commercial customers are required to install and maintain a
backflow device.
Cross Connections
Control Program Regulations
State Approved Backflow Devices
Specifications and Guidelines
The device(s)
shall be installed according to the following guidelines:
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· Installation
will occur with parameters of, 30” maximum height, 12” minimum
height and 24” clearance on all sides and be readily accessible
for testing and repairs.
· Pit
installations will not be allowed.
· The
device should be equipped with a relief valve assembly, which
under certain conditions may dump large volumes of water.
Consequently, adequate drainage should be provided. |
· The
installation of a strainer is strongly recommended to protect
the disks from unnecessary fouling.
· A
bypass around this device will not be allowed (unless protected
by a second device).
· This
device should be installed on the downstream (outlet) side of
the meter.
· This
device should be installed according to manufacturer
specifications. |
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