Page 39 - Vessel Sanitation Program 2018 Operations Manual

VSP 2018 Operations Manual

Automatic pump shut-off (APS): System device that can sense a BLOCKABLE
DRAIN blockage and shut off the pumps in a RECREATIONAL WATER
FACILITY.

AW (water activity): Measurement of the free moisture content in a FOOD.

Baby-only water facility: RECREATIONAL WATER FACILITY designed for
use by children in diapers or who are not completely toilet trained. This facility
must have zero water depth. Control measures for this facility would be detailed
in a VARIANCE.

Backflow: The reversal of flow of water or other liquids, mixtures, or substances
into the distribution pipes of a potable supply of water from any source or sources
other than the source of POTABLE WATER supply. BACKSIPHONAGE and
BACKPRESSURE are forms of backflow.

Backflow prevention device: An APPROVED backflow prevention plumbing
device that must be used on POTABLE WATER distribution lines where there is a
direct connection or a potential CROSS-CONNECTION between the POTABLE
WATER distribution system and other liquids, mixtures, or substances from any
source other than the POTABLE WATER supply. Some devices are designed for
use under continuous water pressure, whereas others are noncontinuous pressure
types.

(See also:
• ATMOSPHERIC VACUUM BREAKER [AVB].
• CONTINUOUS PRESSURE BACKFLOW PREVENTION DEVICE.
• DUAL CHECK VALVE with intermediate atmospheric vent.
• HOSE BIB CONNECTION VACUUM BREAKER.
• PRESSURE VACUUM BREAKER ASSEMBLY.
• REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION
ASSEMBLY.)

Backpressure: An elevation of pressure in the downstream piping system (by
pump, elevation of piping, or steam and/or air pressure) above the supply pressure
at the point of consideration that would cause a reversal of normal direction of
flow.

Backsiphonage: The reversal or flowing back of used, contaminated, or polluted
water from a PLUMBING FIXTURE or vessel or other source into a water supply
pipe as a result of negative pressure in the pipe.

3.0 Definitions; 10