Lecture Notes on Backflow Prevention

Flashcards to aid in studying terms and definitions related to backflow prevention.

Backsiphonage

A reversal of the normal direction of flow in the piping due to a drop in supply pressure, a vacuum, or a negative pressure in the supply piping.

Backflow

A reversal of the normal direction of flow in the piping.

Booster Pump

Any device which is intended to increase the in-line water pressure.

Bypass

Any arrangement of pipes, plumbing, or hoses which are designed to divert the flow around an installed backflow prevention device through which the flow normally passes.

Consumer's Water System

Any water system located on the consumer's premise that is supplied by or is connected in any manner to a public water system.

Containment Principle backflow prevention device

A backflow prevention device that is installed in a water system at the outlet side of the water meter and is intended to contain the water within the building; to prevent any polluted or contaminated water from backflowing into the public water system.

Contaminant

The introduction of a liquid , solid, or gas presents an actual threat to the health or wellbeing of the consumer

Contaminant

Any liquid, solid, or gas that presents an actual threat to the health or well being of the consumer.

Contamination

The introduction of a liquid, solid, or gas that subjects the consumer to potentially lethal waterborne diseases, or illness.

Continuous Pressure

As applied to backflow prevention devices it means water pressure supplied to a device for greater than twelve (12) hours.

Critical Installation Level

The prescribed height that a vacuum breaker or other appurtenance must be installed above the flood level rim of the fixture or receptacle being supplied. If this height is not maintained, then the device may not provide the intended protection. The critical installation level for a vacuum breaker is the bottom of the device when it is not indicated on the body.