As used in this article, the following terms
shall have the meanings indicated:
AIR GAP SEPARATION
A physical break between a supply pipe and a receiving vessel.
The air gap shall be at least double the diameter of the supply pipe,
measured vertically above the top rim of the vessel, in no case less
than one inch.
APPROVED CHECK VALVE
A check valve that seats readily and completely. It must
be carefully machined to have free moving parts and assured watertightness.
The face of the closure element and valve seat must be bronze composition
or other noncorrodible material which will seat tightly under all
prevailing conditions of field use. Pins and bushing shall be of bronze
or other noncorrodible, nonsticking material, machined for easy, dependable
operation. The closure element, e.g. clapper, shall be internally
weighted or otherwise internally equipped to promote rapid and positive
closure in all sizes where this feature is obtainable.
APPROVED DOUBLE CHECK VALVE ASSEMBLY
An assembly of at least two independently acting check valves,
including tightly closing shutoff valves on each side of the check
valve assembly, and suitable leak detector drains plus connections
available for testing the watertightness of each check valve. This
device must be approved as a complete assembly.
APPROVED REDUCED-PRESSURE-PRINCIPLE BACKFLOW PREVENTION DEVICE
A device incorporating two or more check valves and an automatically
operating differential relief valve located between the two checks,
two shutoff valves, and equipped with necessary appurtenances for
testing. The device shall operate to maintain the pressure in the
zone between the two check valves less than the pressure on the public
water supply side of the device.
A.
At cessation of normal flow, the pressure between
check valves shall be less than the supply pressure. In case of leakage
of either check valve, the differential relief valve shall operate
to maintain this reduced pressure by discharging to the atmosphere.
When the inlet pressure is two pounds per square inch or less, the
relief valve shall open to the atmosphere, thereby providing an air
gap in the device. To be approved, these devices must be readily accessible
for maintenance and testing and installed in a location where no part
of the valve will be submerged. The enclosure must be self-draining,
so that the large amount of water which the relief valve may vent
will be disposed of reliably without submergence of the relief valve.
B.
This device must also be approved as a complete
assembly.
AUXILIARY SUPPLY
Any water supply on or available to the premises other than
the approved public water supply.
BAROMETRIC LOOP
A loop of pipe rising approximately 35 feet, at its topmost
point, above the highest fixture it supplies.
CERTIFIED BACKFLOW PREVENTION DEVICE TESTER
A person who has a certificate issued by the State of New
York Department of Health for a backflow prevention device tester.
He or she shall be provided with an appropriate identification card
which must be renewed every three years. Failure to perform his or
her duties competently and conscientiously will result in prompt withdrawal
of his or her authority.
CROSS-CONNECTION
Any unprotected connection between any part of a water system
used or intended to supply water for drinking purposes and any source
or system containing water or substance that is not or cannot be approved
as equally safe, wholesome, and potable for human consumption.
WATER SUPERVISOR
The consumer or a person on the premises charged with the
responsibility of complete knowledge and understanding of the water
supply piping within the premises and for maintaining the consumer's
water system free from cross-connection and other sanitary defects,
as required by regulations and laws.
All applications must be accompanied by plans,
specifications and an engineer's or architect's report describing
the project in detail. The application must be signed by a New York
State registered professional engineer or architect. The project must
first be submitted to the water supplier, who will forward it to the
local public health engineer. This form must be prepared in quadruplicate
with four copies of all plans, specifications and descriptive literature.
The following is an example list of facilities
that are especially likely to have cross-connection hazards. The list
is not intended to be all inclusive.
B. Auxiliary water systems such as wells.
C. Beverage bottling plants.
F. Chemical plants and plating facilities.
H. Hospitals, medical buildings, sanitariums, morgues
and mortuaries.
L. Metal manufacturing, cleaning and fabricating plants.
M. Radioactive materials production or research plants.
N. Restricted, classified or other facilities closed
to the public.
P. Buildings heated by boilers where treatment chemicals
are used.
Q. Building with certain types of air-conditioning systems.
U. Fire hydrants not under the control of the public
water supplier.