GPT Gas Pipe Installation & Repair 3

Question 1

What test is required to verify the integrity of a gas piping system before it is placed into service?

Accepted Answer

Pressure test using air, CO2, or nitrogen at required test pressure

Answer

Gas piping must be pressure-tested with an inert gas (air, nitrogen, or CO2) before being placed into service to detect leaks without using combustible gas.

Question 2

According to NFPA 54, what is the typical test pressure for gas piping systems operating at 0.5 psig or less?

Accepted Answer

1 psig for 10 minutes

Answer

For systems operating at ½ psig or less, NFPA 54 requires a test pressure of at least 3 inches w.c. (≈0.1 psig), but many jurisdictions require at least 1½ times the working pressure, commonly 1 psig.

Question 3

Which fitting is NOT allowed in a concealed gas piping installation inside walls?

Accepted Answer

Mechanical (compression) couplings

Answer

Standard mechanical or compression couplings are generally not permitted in concealed locations because they require periodic inspection and adjustment.

Question 4

What is the minimum clearance required between a gas meter and an electrical meter or panel?

Accepted Answer

3 feet

Answer

Gas meters must maintain at least 3 feet of separation from electric meters, service panels, and other ignition sources per code.

Question 5

When sizing a gas pipe, which factor has the GREATEST effect on pressure drop across the run?

Accepted Answer

Pipe length

Answer

Pressure drop increases with pipe length; longer runs require larger diameter pipe to maintain adequate pressure at the appliance.

(GPT) Gas Pipe Technician Certification Practice Test

(GPT) Gas Pipe Technician Certification Practice Test

GPT Gas Pipe Installation & Repair 3