FREE IPC Water Supply and Distribution Questions and Answers

Question 1

A new building's water service pipe is being installed in a region with a known frost line depth of 18 inches.
According to the IPC, what is the minimum required burial depth for this pipe to prevent freezing?

Accepted Answer

At least 12 inches below grade and at least 6 inches below the frost line.

Answer

Exactly at the frost line of 18 inches.

Answer

A minimum of 12 inches below grade, regardless of the frost line.

Answer

A minimum of 24 inches below grade to be safe.

Question 2

In a residential building, the static water pressure from the municipal supply is measured at 95 psi. What action is required by the IPC to be taken on the water distribution system?

Accepted Answer

Install a pressure-reducing valve.

Answer

No action is required as this pressure is acceptable.

Answer

Install a pressure-relief valve set at 100 psi.

Answer

Notify the water purveyor to lower the main pressure.

Question 3

When installing a temperature and pressure (T&P) relief valve discharge pipe for a water heater, which of the following is an IPC requirement for the termination point?

Accepted Answer

The termination point must be located in a manner that prevents scalding of occupants.

Answer

The pipe must be threaded at the end to allow for a cap.

Answer

The pipe can terminate directly into the sanitary drainage system.

Answer

The termination must be located a maximum of 2 inches above the floor or flood level rim of a receptor.

Question 4

A plumber is hydrostatically testing a newly installed potable water supply system. According to the IPC, what is the minimum required test pressure and duration?

Accepted Answer

1.5 times the working pressure, but not less than 100 psi, for 15 minutes.

Answer

50 psi for 30 minutes.

Answer

100 psi for 15 minutes.

Answer

Not less than the working pressure under which it is to be used, for 15 minutes.

Question 5

Which of the following locations is mandated by the IPC for the installation of water hammer arrestors?

Accepted Answer

Where quick-closing valves are installed.

Answer

On all fixture supplies longer than 5 feet.

Answer

At the base of every water supply riser.

Answer

Only on hot water lines serving kitchen sinks.

Question 6

To protect the potable water supply from contamination, a potable water inlet to a gravity storage tank must be terminated with an air gap. What is the minimum air gap dimension required by the IPC?

Accepted Answer

4 inches (102 mm) above the flood level rim of the overflow.

Answer

1 inch (25 mm).

Answer

Twice the diameter of the effective opening, but not less than 1 inch.

Answer

6 inches (152 mm).

A new building's water service pipe is being installed in a region with a known frost line depth of 18 inches.According to the IPC, what is the minimum required burial depth for this pipe to prevent freezing?

A new building's water service pipe is being installed in a region with a known frost line depth of 18 inches.
According to the IPC, what is the minimum required burial depth for this pipe to prevent freezing?