FREE IPC Sanitary Drainage Systems Questions and Answers

Question 1

A plumber is installing a horizontal sanitary drainage line for a series of floor drains in a commercial kitchen.
The pipe has a diameter of 4 inches.
According to IPC Table 704.1, what is the minimum required slope for this 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 wet vent is being installed to serve two full bathroom groups on the same floor. Which of the following is a requirement for this type of installation under the IPC?

Accepted Answer

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

Answer

The wet vent can also serve fixtures on the floor below.

Answer

A maximum of one bathroom group can be served by a wet vent.

Answer

The dry vent connection must be located downstream of all fixture connections.

Question 3

When transitioning a sanitary drainage line from horizontal to vertical, which of the following fittings is generally prohibited by the IPC for this specific change in direction?

Accepted Answer

Sanitary tee used on its back

Answer

Combination wye and 1/8 bend

Answer

45-degree wye

Answer

Long-sweep quarter bend

Question 4

A building's sanitary drainage system is located in a basement, and the fixtures are below the level of the public sewer. What does the IPC require for discharging the waste?

Accepted Answer

Discharge into a tightly covered and vented sump that is automatically pumped to the building drain.

Answer

A gravity-fed drain with an increased slope to overcome the elevation difference.

Answer

Direct connection to the storm drain system, which is typically at a lower elevation.

Answer

Installation of a backwater valve is sufficient to allow for gravity drainage.

Question 5

According to the IPC, what is the maximum required spacing between cleanouts on a horizontal sanitary drainage line that is 6 inches in diameter?

Accepted Answer

100 feet

Answer

50 feet

Answer

75 feet

Answer

150 feet

Question 6

Which of the following correctly distinguishes between a 'building drain' and a 'building sewer' as defined by the IPC?

Accepted Answer

A building drain is the horizontal piping within a building, while the building sewer is the piping outside the building that connects to the public main.

Answer

A building drain serves only sanitary fixtures, while a building sewer serves both sanitary and storm.

Answer

The building sewer is always made of cast iron, while the building drain can be PVC or ABS.

Answer

The terms are interchangeable and refer to the same main drainage pipe.

A plumber is installing a horizontal sanitary drainage line for a series of floor drains in a commercial kitchen.The pipe has a diameter of 4 inches.According to IPC Table 704.1, what is the minimum required slope for this pipe?

A plumber is installing a horizontal sanitary drainage line for a series of floor drains in a commercial kitchen.
The pipe has a diameter of 4 inches.
According to IPC Table 704.1, what is the minimum required slope for this pipe?