Installing a backflow prevention assembly on the water service at the meter, to protect the public system from everything on the premises, is called:
- isolation
- containment
- segregation
- abatement
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B. containment
Containment (service protection) puts the protection at the service connection so the public main is protected from the whole premises. Isolation protects at individual points of use inside the premises.
Reference: AWWA Manual M14, Backflow Prevention and Cross-Connection Control, service protection
Protecting a single fixture or piece of equipment inside a building with its own backflow preventer is called:
- containment
- isolation
- detection
- retention
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B. isolation
Isolation (internal protection) protects the building's own occupants by placing protection at each point of use. Containment protects only the public system at the service connection.
Reference: AWWA Manual M14, Backflow Prevention and Cross-Connection Control, internal protection
A direct cross-connection, such as a potable make-up line piped solidly to a boiler, is subject to:
- backsiphonage but not backpressure
- backpressure but not backsiphonage
- neither of the two types of backflow
- both backpressure and backsiphonage
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D. both backpressure and backsiphonage
A direct connection is piped solidly, so it can see both backpressure and backsiphonage. An indirect connection, such as an outlet ending below a rim, is subject to backsiphonage only.
Reference: EPA Cross-Connection Control Manual (EPA 816-R-03-002), ch. 3