Code, Non- Testable & AVB Flashcards
The physical operation of a hose bibb vacuum breaker is classified as a type of:
AVB
What is every vacuum breaker designed to do?
prevent backsiphonage backflow
What is the minimum requirement for an air gap separation?
Twice the diameter of the supply pipe , but not less than 1”
An AVB must be installed at least how many inches above the downstream use unless it is deck mounted and than it is _____.
6” above and 1”if deck mounted
What are the most important factors to consider went choosing a backflow preventer for an installation?
Type of backflow and degree of hazard
An AVB ‘s critical component subject to failure is the ____?
Air Inlet valve
An air gap separation is measured from the outlet to the _________?
flood level rim of the receptacle
An AVB shall not be subjected to continuous water pressure for periods longer than ____ hours.
12 hours
An air gap affected by one wall must be increased to how many pipe diameters?
3 pipe diameters
An air gap affected by two walls must be increased to how many pipe diameters?
4 pipe diameters
A tank type toilet has what kind of backflow preventer ?
An air gap
A flushometer has what kind of backflow preventer ?
An AVB
A carbonated beverage machine requires a backflow preventer between it and the potable water supply because of _________?
The carbon dioxide gas
A barometric loop provides what kind of protection to the water supply?
backsiphonage backflow only
Why must adequate clearance be provided above a backflow prevention assembly?
operation,testing,maintenance & repair
