Master Plumber Exam DWV and Storm Drainage 5

Question 1

What is the maximum trap-to-vent distance for a 3-inch trap arm under the IPC?

Accepted Answer

10 feet

Answer

Per IPC Table 909.1, a 3-inch trap arm may extend a maximum of 10 feet from the trap to the vent.

Question 2

In a DWV system, which stack is used exclusively for venting and carries no waste?

Accepted Answer

Vent stack

Answer

A vent stack is a vertical pipe used solely for venting purposes; it carries no sewage or waste water.

Question 3

When is an 'island fixture vent' (Chicago loop) used?

Accepted Answer

When a fixture cannot be vented through the roof due to its location in a kitchen island

Answer

An island fixture vent loops up from the drain and back down, then runs beneath the floor to connect to a vent stack, used when fixtures are in islands away from walls.

Question 4

What is the minimum depth of cover required for a building sewer installed under a driveway?

Accepted Answer

18 inches

Answer

The IPC requires a minimum of 18 inches of cover for a building sewer installed under a driveway subject to vehicular traffic.

Question 5

A 'circuit vent' in a DWV system serves which purpose?

Accepted Answer

It vents a battery of fixtures connected to a horizontal branch with a single vent at the end

Answer

A circuit vent serves a group (battery) of fixtures on a common horizontal branch by venting the branch with a single vent connection at its upstream end.

Master Plumber Exam Practice Test

Master Plumber Exam Practice Test

Master Plumber Exam DWV and Storm Drainage 5