Plumbing DWV Flashcard

Front

Why must venting systems maintain constant atmospheric pressure?

Back

To prevent siphoning of traps and slow drainage

Front

What is the main purpose of a P-trap in a drainage system?

Back

To prevent sewer gases from entering the room

Front

A branch drain downstream of a third water closet must be what minimum size according to the NPC?

Back

4 inches

Front

What material has a higher fire/smoke rating but is more labor-intensive to install? Options: ABS plastic, PVC plastic, Copper, Cast iron

Back

Cast iron

Front

What type of joint is formed with rubber couplings and gear clamps?

Back

Mechanical joint (MJ)

Front

Which component must be installed with every flat vent?

Back

Cleanout

Front

How far can a 1.5" trap arm run before it needs to be vented?

Back

6'.

Front

What is the term for a drainage pipe that is downstream of two or more fixture drains?

Back

Branch

Front

What is the appropriate grade for 4" drainage pipe?

Back

1:100

Front

When can you use defective material?

Back

Never