GPT Gas Pipe Installation & Repair 2

Question 1

When making a threaded connection on a gas piping system, what must be applied to the male threads?

Accepted Answer

Pipe joint compound approved for gas service or yellow Teflon tape

Answer

Only pipe joint compound or Teflon tape specifically listed for gas service (yellow) may be used on threaded gas connections.

Question 2

What is the minimum burial depth for a metallic gas service line installed under a public roadway?

Accepted Answer

36 inches

Answer

NFPA 54 and most jurisdictions require at least 36 inches of cover for gas lines under roads subject to vehicle traffic.

Question 3

Which material is NOT acceptable for use as an indoor gas piping system in a residential application?

Accepted Answer

PVC plastic pipe

Answer

PVC and other non-metallic plastics are not approved for interior gas piping due to fire and UV degradation risks.

Question 4

A drip leg (sediment trap) is required immediately upstream of which component?

Accepted Answer

Each gas appliance

Answer

A drip leg is installed immediately upstream of each gas appliance to capture moisture and debris before they enter the appliance.

Question 5

What is the correct procedure when a threaded union is needed in a gas piping system?

Accepted Answer

Install it in an accessible location and ensure it is union-rated for gas

Answer

Gas unions must be rated for gas service and located in accessible areas so they can be inspected and serviced.

(GPT) Gas Pipe Technician Certification Practice Test