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Terms in this set (29)
Approved Air-Gap Separation
At least twice the diameter of the supply pipe. it is measured vertically the overflow rim of the receiving vessel.
Device used to create suction, specifically by flowing water through a venturi or restricted of flow.
the effect by an aspirator, restricted area of flow or undersized piping.
the reverse flow of contaminants through a cross-connection into a drinkable water supply or a reversal flow of liquids, gases or other substances. (two Types)
Pressure in the downstream piping system.
a sub-atmospheric pressure.
an actual hazard to the public health through poisoning, the spread of disease etc.
Any actual or potential connection or structural arrangement between a public or a consumer's potable water system and or any other source.
Direct cross connection
subject to BOTH backsiphonage and backpressure
indirect cross connection
subjected to ONLY backsiphonage.
Release of harmful materials into the environment. Does not create hazard to the public.
When an incompressible fluid velocity increases as a result of flowing through a constricted area of piping, the pressure will decrease.
A piping apparatus with a constricted region designed to increase the velocity and thus decrease the pressure of an incompressible fluid in the constricted region.
reduced pressure principle assembly
Consists of two internally loaded check valves in series and a mechanically independent differential pressure relief valve located between the two check valves.
A 1'' square water column _______ feet high will generate a pressure of 1.0 psi at the bottom.
Atmosphere pressure at sea level is_______ psia (pounds per square inch, absolute).
Pressure vacuum breaker backsiphonage prevention assembly
An assembly containing an independently operating internally loaded air inlet valve located on the discharge side of the check valve.
Two independently acting
Double check valve back flow prevention assembly
As water flows through a pipe, the pressure against the wall of the pipe___________ as the velocity of the water increases.
A_______, is aesthetically objectionable, however, it will not cause illness or death.
A______,is a substance, which could cause illness or death.
Any substance that shall impair the quality of water, in such away as to create an actual hazard to the public health through poisoning, the spread of diseases.
Contaminant, health hazard
Pressure measured on a scale where a perfect vacuum is zero. Absolute pressure is the sum of gage pressure and atmospheric pressure.
When an incompressible fluid's velocity increases as a result of flowing through a constricted area of piping, the pressure will decrease.
A person who has proven ability in field testing back flow prevention assemblies to the satisfaction of the administrative authority having jurisdiction, either directly or through a third party certification program.
Certified backflow prevention assembly tester.
A specially designed assembly composed of a line-size approved reduced pressure principle backflow prevention assembly with a specific bypass containing a specific water meter and an approved reduced pressure principle backflow prevention assembly.
Reduced pressure principle detector backflow prevention assembly.
An assembly containing two independently acting approved check valves together with a hydraulically operating mechanically independent pressure differential relief valve located between the check valves and at the same time below the first check valve.
reduced pressure principle backflow prevention assembly.
When using an atmospheric vacuum breaker for a irrigation system the AVB must be a minimum of _________ inches above all downstream piping and use.
When using a pressure vacuum (PVB or SVB) for a irrigation system the PVB or SVB must be minimum of ______ inches above all downstream piping and use.
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