OHIO DEPARTMENT OF COMMERCE BACKFLOW PREVENTION
MANUAL DEFINITIONS EXAM QUESTIONS WITH COMPLETE
SOLUTIONS VERIFIED
Absolute Pressure
The total pressure gauge pressure plus atmospheric pressure.
Approved Air-Gap Separation
Is a distance through the free atmosphere equal to two times the nominal diameter of
the supply pipe discharge opening, but never less than one inch.
Atmospheric Pressure
The pressure exerted by the weight of the atmosphere (14.7 pig) at sea level. As the
elevation above sea level increases, the atmospheric pressure decreases.
Auxiliary Water System
Any water system on or available to the premises other than the public water system.
Booster Pump
Any device which is intended to increase the in-line water pressure.
Bypass
Any arrangement of pipes, plumbing or hoses which are designed to divert the flow
around an installed back flow prevention device through which the flow normally passes
Consumer's Water System
Any water system located on the consumer's premise that is supplied by or is connected
in any manner to a public water system.
, Containment Principle Back flow Prevention Device
A water system at the outlet side of the water meter, and is intended to contain the
water within the building: to prevent any polluted or contaminated water from back
flowing into the public water system.
Contaminant
Any liquid, solid or gas that presents an actual threat to the health or well being of the
consumer.
Continuous Pressure
As applied to back flow prevention devices it means water pressure supplied to a device
for greater than twelve hours.
Critical Installation Level
Prescribed height that a vacuum breaker or other appurtenance must be installed above
the flood level rim of the fixture or receptacle being supplied.
Cross Connection Control
The use of a device, method or procedure to prevent back flow into a potable water
system through a cross connection.
Differential Pressure Gauge
A testing device that measures two separate pressures and indicates the difference
between the two; differential pressure is indicated as pounds per square inch differential
(psid).
Direct Connection
Any arrangement of pipes, fixtures or devices that connects a non-potable source to a
potable water system, such as a boiler feed line.
MANUAL DEFINITIONS EXAM QUESTIONS WITH COMPLETE
SOLUTIONS VERIFIED
Absolute Pressure
The total pressure gauge pressure plus atmospheric pressure.
Approved Air-Gap Separation
Is a distance through the free atmosphere equal to two times the nominal diameter of
the supply pipe discharge opening, but never less than one inch.
Atmospheric Pressure
The pressure exerted by the weight of the atmosphere (14.7 pig) at sea level. As the
elevation above sea level increases, the atmospheric pressure decreases.
Auxiliary Water System
Any water system on or available to the premises other than the public water system.
Booster Pump
Any device which is intended to increase the in-line water pressure.
Bypass
Any arrangement of pipes, plumbing or hoses which are designed to divert the flow
around an installed back flow prevention device through which the flow normally passes
Consumer's Water System
Any water system located on the consumer's premise that is supplied by or is connected
in any manner to a public water system.
, Containment Principle Back flow Prevention Device
A water system at the outlet side of the water meter, and is intended to contain the
water within the building: to prevent any polluted or contaminated water from back
flowing into the public water system.
Contaminant
Any liquid, solid or gas that presents an actual threat to the health or well being of the
consumer.
Continuous Pressure
As applied to back flow prevention devices it means water pressure supplied to a device
for greater than twelve hours.
Critical Installation Level
Prescribed height that a vacuum breaker or other appurtenance must be installed above
the flood level rim of the fixture or receptacle being supplied.
Cross Connection Control
The use of a device, method or procedure to prevent back flow into a potable water
system through a cross connection.
Differential Pressure Gauge
A testing device that measures two separate pressures and indicates the difference
between the two; differential pressure is indicated as pounds per square inch differential
(psid).
Direct Connection
Any arrangement of pipes, fixtures or devices that connects a non-potable source to a
potable water system, such as a boiler feed line.
