Journeyman Plumbers Gas Piping and Venting Questions and Answers

Question 1

A plumber is using the longest length method to size a natural gas piping system. What is the first critical measurement required for this method?

Accepted Answer

The measured length of pipe from the point of delivery to the most remote gas outlet.

Answer

The total connected BTUH load of all appliances.

Answer

The diameter of the gas meter outlet.

Answer

The gas pressure at the street main.

Question 2

Which of the following gas appliances typically does NOT require the installation of a sediment trap according to most fuel gas codes?

Accepted Answer

A gas clothes dryer.

Answer

A gas-fired furnace.

Answer

A residential gas water heater.

Answer

A commercial gas boiler.

Question 3

A high-efficiency condensing gas furnace is being installed. This appliance operates with a positive vent static pressure and produces acidic condensate. To which venting category does this appliance belong?

Accepted Answer

Category IV

Answer

Category I

Answer

Category II

Answer

Category III

Question 4

When installing a flexible gas appliance connector for a residential gas range, what is the maximum permitted length according to most standards?

Accepted Answer

6 feet (1.8 m)

Answer

3 feet (0.9 m)

Answer

4 feet (1.2 m)

Answer

10 feet (3 m)

Question 5

A journeyman plumber is installing a Corrugated Stainless Steel Tubing (CSST) gas line in a new residential construction. What is a critical safety requirement regarding the bonding of this piping system?

Accepted Answer

The system must be bonded to the electrical service grounding system with a conductor no smaller than a #6 AWG copper wire.

Answer

The CSST itself must be used as the grounding electrode.

Answer

A bonding clamp must be attached directly to the corrugated portion of the tubing.

Answer

The system must be bonded to the electrical service grounding system with a #10 AWG copper wire.

Question 6

A plumber pressurizes a newly installed gas piping system for a leak test. For a typical residential system tested with air, what is the common minimum test pressure and duration required by code?

Accepted Answer

10 psi for 15 minutes

Answer

5 psi for 10 minutes

Answer

50 psi for 30 minutes

Answer

Working pressure for 24 hours