BACKFLOW TEST V COMPLETE COURSE
REVIEW GUIDE
◉ An approved air gap used for backflow prevention shall be.
Answer: a vertical dimension of at least twice the diameter of the
supply pipe and but in no case less than
one inch above the overflow rim
◉ The proper location for a backflow prevention assembly for the
protection of a service connection is:.
Answer: in an above grade, protected and accessible site and before
any Tees in the service line
◉ If water is continuously flowing from the relief valve port of a
reduced pressure principle backflow prevention assembly the
person testing the assembly could report:.
Answer: the first check may be fouled; or the relief valve may have
malfunctioned; or the second check is
fouled with backpressure on the assembly
◉ Backpressure will cause backflow:.
Answer: through an unprotected feed to a closed make-up water
tank
,◉ The primary responsibility for requiring the testing, maintenance
and reporting on service protection backflow prevention assemblies
is normally vested in the:.
Answer: Water Purveyor
◉ In testing a reduced pressure principle backflow prevention
assembly.
Answer: the relief valve must be tested first
◉ A water agency or public health agency may require more
frequent testing of a backflow prevention assembly than the
maximum time allowed between testing. What is the maximum legal
length of time permitted between tests?.
Answer: twelve months
◉ One form of backflow is:.
Answer: backsiphonage through a submerged inlet
◉ When a perfect vacuum, at sea level, draws water up into a 40 foot
vertical pipe, the pressure in the pipe above the water surface in the
pipe is:.
Answer: zero psia
, ◉ As you test the number one check valve of a double check valve
assembly you open the number three test cock to atmosphere. Water
continues to discharge from the sight tube. You may continue in the
following manner.
Answer: observe the reading on your test kit, slowly open the bleed
valve arrangement to compensate for a leaking number one shut off
valve
◉ Which of the following types of cross-connections are considered
to be illegal.
Answer: a by-pass hose with a shut off valve circumventing a
reduced pressure principle backflow
assembly
◉ Backsiphonage due to an aspirator effect may be caused by:.
Answer: high velocity flow of water through a pipe tee
◉ The term "approved reduced pressure principle assembly" applies
to:.
Answer: an assembly of two approved check valves, with an
approved differential relief valve between the check valves, four
properly located and approved test cocks and two approved shut off
valves
REVIEW GUIDE
◉ An approved air gap used for backflow prevention shall be.
Answer: a vertical dimension of at least twice the diameter of the
supply pipe and but in no case less than
one inch above the overflow rim
◉ The proper location for a backflow prevention assembly for the
protection of a service connection is:.
Answer: in an above grade, protected and accessible site and before
any Tees in the service line
◉ If water is continuously flowing from the relief valve port of a
reduced pressure principle backflow prevention assembly the
person testing the assembly could report:.
Answer: the first check may be fouled; or the relief valve may have
malfunctioned; or the second check is
fouled with backpressure on the assembly
◉ Backpressure will cause backflow:.
Answer: through an unprotected feed to a closed make-up water
tank
,◉ The primary responsibility for requiring the testing, maintenance
and reporting on service protection backflow prevention assemblies
is normally vested in the:.
Answer: Water Purveyor
◉ In testing a reduced pressure principle backflow prevention
assembly.
Answer: the relief valve must be tested first
◉ A water agency or public health agency may require more
frequent testing of a backflow prevention assembly than the
maximum time allowed between testing. What is the maximum legal
length of time permitted between tests?.
Answer: twelve months
◉ One form of backflow is:.
Answer: backsiphonage through a submerged inlet
◉ When a perfect vacuum, at sea level, draws water up into a 40 foot
vertical pipe, the pressure in the pipe above the water surface in the
pipe is:.
Answer: zero psia
, ◉ As you test the number one check valve of a double check valve
assembly you open the number three test cock to atmosphere. Water
continues to discharge from the sight tube. You may continue in the
following manner.
Answer: observe the reading on your test kit, slowly open the bleed
valve arrangement to compensate for a leaking number one shut off
valve
◉ Which of the following types of cross-connections are considered
to be illegal.
Answer: a by-pass hose with a shut off valve circumventing a
reduced pressure principle backflow
assembly
◉ Backsiphonage due to an aspirator effect may be caused by:.
Answer: high velocity flow of water through a pipe tee
◉ The term "approved reduced pressure principle assembly" applies
to:.
Answer: an assembly of two approved check valves, with an
approved differential relief valve between the check valves, four
properly located and approved test cocks and two approved shut off
valves
