OHIO BACKFLOW EXAM QUESTIONS AND ANSWERS

OHIO BACKFLOW EXAM QUESTIONS
AND ANSWERS



Air Gap - Correct Answers -an air space that separates a water supply outlet from a
potentially contaminated source. (above the overflow line, at least 2x the diameter of the
supply pipe)

barometric loop - Correct Answers -A vertical loop of pipe, rising to a height sufficient to
prevent back-siphonage from occurring in the potable water supply pipe. (Approximately
35 feet, depending on the weight of the atmosphere.)
hose connection backflow preventer - Correct Answers -#1052
back siphon
high hazard

pressure vacuum breaker - Correct Answers -#1020
back siphon crit lvl 12"
high hazard

back siphonage vaccum preventor - Correct Answers -#1056
back siphon crit lvl 1" when equipment
high hazard mounted otherwise 6"

atmosphereic vacum breakers - Correct Answers -ASSE # 1001
Back Siphon
High Hazard
( Critical level of 6" open to atmosphere, no control downstream

Water closet flush tank ball cock - Correct Answers -# 1002
back siphon
high hazard

hose connection vacuum breaker - Correct Answers -#1011
Back Siphon
high hazard (single check)

freeze proof wall hydrant - Correct Answers -#1019
Back Siphon
high hazard