IPC - International Plumbing Code Sanitary Drainage Systems Questions and Answers

Question 1

According to the IPC, what is the minimum required slope for a 4-inch horizontal sanitary drainage pipe?

Accepted Answer

1/8 inch per foot

Answer

1/16 inch per foot

Answer

1/4 inch per foot

Answer

1/2 inch per foot

Question 2

A plumber is installing a new building sewer. According to the IPC, a cleanout is required at intervals of not more than:

Accepted Answer

100 feet

Answer

50 feet

Answer

150 feet

Answer

75 feet

Question 3

Which of the following fittings is generally prohibited for use in a sanitary drainage system to connect a horizontal drain to another horizontal drain?

Accepted Answer

Sanitary tee

Answer

Wye fitting

Answer

Combination wye and 1/8 bend

Answer

Long-sweep quarter bend

Question 4

In a multistory building, a cleanout is required at the base of each waste or soil stack. The IPC requires the size of this cleanout for a 3-inch stack to be:

Accepted Answer

The same nominal size as the pipe it serves

Answer

Not less than 4 inches

Answer

One pipe size smaller than the stack

Answer

At least 1 1/2 inches

Question 5

A horizontal wet vent is being installed to serve two bathroom groups on the same floor. According to the IPC, which of the following statements is correct?

Accepted Answer

Each wet-vented fixture drain must connect independently to the horizontal wet vent.

Answer

The wet vent can serve fixtures on multiple floors.

Answer

Any fixture can connect to the wet-vented section.

Answer

The wet vent portion of the pipe is sized smaller than a standard drain.

Question 6

A plumber needs to install a horizontal drainage branch that will carry a total of 30 Drainage Fixture Units (DFUs). The pipe will be installed with a slope of 1/4 inch per foot. Based on IPC Table 710.1(2), what is the minimum required size for this horizontal branch?

Accepted Answer

3 inches

Answer

2 inches

Answer

4 inches

Answer

2 1/2 inches