Backflow Test #1 - Questions With Fully Explained
Solutions
Which type of backflow preventer is most reliable Correct Answer -
Air gap
What is the maximum pressure drop a little through a double check
now assembly Correct Answer - 10 psi
To break the back-siphonage action the best approach is Correct
Answer - Introduce air into the system
The maximum height that water can be drawn above a free water
surface by back-siphoange is Correct Answer - 34 feet
Watermain pressure is drastically reduced to a reduce pressure
principal backflow preventer the relief valve should Correct Answer
- Always open to discharge the water in the zone
In approved Errgott must have at least __________of free air space
Correct Answer - A minimum of two pipe diameter of the supply
pipe or 6 inches which ever is lesser
What is the most important step before installing backflow prevention
assemblies in new or existing lines Correct Answer - Play planes
will be flushed all chips scale and foreign matter
A parallel side-by-side backflow prevention assembly installation as
desired in order to Correct Answer - Allow for testing and
maintenance
When testing an RP the relief of discharges at the number to shut off
valve is closed the problem is Correct Answer - A faulty number
one check valve
