Journeyman Plumbers Exam Drainage, Waste, and Venting 5

Question 1

When testing a DWV system with water, to what height must the water column be maintained above the highest point of the system?

Accepted Answer

10 feet

Answer

A water test requires the system to be filled to a 10-foot head of water above the highest point being tested, per the UPC.

Question 2

What is a 'P-trap'?

Accepted Answer

A fixture trap with a water seal that prevents sewer gas entry

Answer

A P-trap is the standard fixture trap that maintains a water seal to prevent sewer gases from entering the building through fixture drains.

Question 3

A soil pipe carries which type of waste?

Accepted Answer

Human waste and urine from water closets and urinals

Answer

A soil pipe is defined as a pipe that conveys the discharge of water closets and urinals, with or without other waste.

Question 4

What is the minimum size of a building sewer that receives discharge from a water closet?

Accepted Answer

4 inches

Answer

The minimum building sewer size that receives water closet discharge is 4 inches per the UPC.

Question 5

Which venting arrangement is used when a vent pipe must be routed under a slab before it can rise to open air?

Accepted Answer

An engineered vent system approved by the AHJ

Answer

When a vent must pass under a slab, an engineered vent system specifically approved by the authority having jurisdiction (AHJ) is required.

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