FREE Journeyman Plumbers Gas Piping and Appliances Questions and Answers

Question 1

A plumber is installing a natural gas piping system for a new residential furnace.
According to most fuel gas codes, which of the following is a mandatory requirement for the piping installation just before the final connection to the furnace?

Accepted Answer

A sediment trap must be installed downstream of the appliance shutoff valve and as close to the appliance inlet as practical.

Answer

A flexible appliance connector must be used for the final 3 feet of the connection.

Answer

The piping must be painted yellow for identification purposes throughout its entire length.

Answer

The gas pipe must be electrically bonded to the cold water piping within 1 foot of the appliance.

Question 2

When installing Corrugated Stainless Steel Tubing (CSST) for a gas line in a residence, what is the minimum size copper bonding conductor required to be connected from the gas piping system to the building's electrical service grounding electrode system?

Accepted Answer

6 AWG

Answer

10 AWG

Answer

8 AWG

Answer

12 AWG

Question 3

A plumber needs to pressure test a newly installed natural gas piping system in a single-family home. The proposed maximum working pressure is less than 0.5 psi (14 inches water column). According to the International Fuel Gas Code (IFGC), what is the minimum required test pressure?

Accepted Answer

3 psi for 10 minutes

Answer

1.5 psi for 5 minutes

Answer

10 psi for 30 minutes

Answer

5 psi for 15 minutes

Question 4

Which of the following locations is explicitly prohibited for the installation of a gas shutoff valve according to most model fuel gas codes?

Accepted Answer

Within a furnace plenum or concealed location

Answer

In the same room as the appliance

Answer

Outdoors, adjacent to the gas meter

Answer

In a utility closet with other mechanical equipment

Question 5

A plumber is installing 1-inch Schedule 40 steel pipe for a horizontal natural gas run. According to common piping standards (ASME B31.1), what is the maximum recommended support spacing for this horizontal pipe?

Accepted Answer

8 feet

Answer

4 feet

Answer

12 feet

Answer

6 feet

Question 6

A natural gas vent for a Category I appliance terminates through a pitched roof. What is the minimum height the vent must extend above the point where it passes through the roof surface?

Accepted Answer

12 inches

Answer

6 inches

Answer

24 inches

Answer

18 inches

A plumber is installing a natural gas piping system for a new residential furnace.According to most fuel gas codes, which of the following is a mandatory requirement for the piping installation just before the final connection to the furnace?

A plumber is installing a natural gas piping system for a new residential furnace.
According to most fuel gas codes, which of the following is a mandatory requirement for the piping installation just before the final connection to the furnace?