Master Plumber Gas Piping Systems Questions and Answers

Question 1

A master plumber is installing a natural gas piping system with a proposed maximum working pressure of 0.5 psi.
According to the IFGC, what is the minimum required test pressure and duration for this new piping system before any appliance is connected?

Accepted Answer

3.0 psi for 10 minutes

Answer

1.5 psi for 10 minutes

Answer

5.0 psi for 15 minutes

Answer

1.0 psi for 30 minutes

Question 2

When installing a sediment trap for a gas furnace, which of the following configurations is correct according to most fuel gas codes?

Accepted Answer

A tee fitting with the gas flow entering the top of the tee and exiting the side outlet, with a capped nipple on the bottom.

Answer

A tee fitting with the gas flow entering one side of the run and exiting the other, with a capped nipple on the bottom.

Answer

A 90-degree elbow with a capped nipple installed on the outlet before the appliance connector.

Answer

Installed immediately after the gas meter, before any branches to appliances.

Question 3

A plumber is running Corrugated Stainless Steel Tubing (CSST) through a new wood-framed wall. The tubing is located 1 inch from the face of a stud. Which of the following is required by the IFGC?

Accepted Answer

A steel striker plate must be installed to protect the tubing.

Answer

The CSST must be sleeved in Schedule 40 steel pipe.

Answer

The CSST must be rerouted to be at least 3 inches from the stud face.

Answer

No additional protection is required if the CSST has a yellow jacket.

Question 4

According to the IFGC, which of the following locations is explicitly prohibited for the installation of gas piping?

Accepted Answer

Through a clothes chute or elevator shaft.

Answer

In a ventilated attic space.

Answer

In an accessible, above-ceiling space.

Answer

Underground beneath an exterior concrete walkway.

Question 5

A master plumber is sizing a natural gas piping system using the longest length method. The most remote appliance is a furnace located 75 feet from the meter. The total connected load for the entire system is 250,000 BTU/hr. Using a standard sizing table for 0.5 psi gas pressure with a 0.5-inch water column pressure drop, which sizing column should be used to size ALL pipe sections?

Accepted Answer

The column for the next length longer than 75 feet, such as 80 or 90 feet.

Answer

The column corresponding to the specific length of each individual pipe section.

Answer

The column for 250 CFH (cubic feet per hour).

Answer

The column that corresponds to the largest pipe diameter required.

Question 6

When bonding a Corrugated Stainless Steel Tubing (CSST) gas piping system, what is the minimum size copper bonding jumper required by the IFGC, and where must it be attached?

Accepted Answer

6 AWG, attached to a rigid pipe component or fitting downstream of the point of delivery.

Answer

10 AWG, attached directly to the CSST.

Answer

8 AWG, attached to the gas meter.

Answer

4 AWG, attached to the appliance shutoff valve.

A master plumber is installing a natural gas piping system with a proposed maximum working pressure of 0.5 psi.According to the IFGC, what is the minimum required test pressure and duration for this new piping system before any appliance is connected?

A master plumber is installing a natural gas piping system with a proposed maximum working pressure of 0.5 psi.
According to the IFGC, what is the minimum required test pressure and duration for this new piping system before any appliance is connected?