GPT Installation Techniques 2

Question 1

What is the minimum clearance required between a gas pipe and an electrical conduit running parallel in the same enclosure?

Accepted Answer

1 inch

Answer

Gas piping must maintain at least 1 inch of clearance from electrical conduit when running parallel to prevent heat transfer and potential hazards.

Question 2

When installing a gas meter riser, which pipe orientation is required for the drip leg (sediment trap)?

Accepted Answer

Vertical drop with end cap

Answer

A drip leg must be installed as a vertical drop with an end cap to collect moisture and debris before they reach the meter or appliances.

Question 3

Which thread sealant is NOT acceptable for use on gas piping connections in the US?

Accepted Answer

Standard white PTFE plumber's tape

Answer

Standard white PTFE tape (plumber's tape) is not rated for gas service and can degrade, creating leak paths; only yellow gas-rated PTFE tape or gas-rated compounds are acceptable.

Question 4

When trenching for underground gas service, what material must be placed beneath the pipe to provide bedding support?

Accepted Answer

Clean sand or fine-grain bedding

Answer

Clean sand or fine-grain bedding material is required beneath underground gas pipe to provide uniform support and prevent point loading that could damage the pipe.

Question 5

A gas line passes through a concrete foundation wall. What must be installed around the pipe at the penetration point?

Accepted Answer

A wall sleeve with an annular seal

Answer

A wall sleeve with an annular seal (or escutcheon) must be installed at foundation penetrations to allow for pipe movement and prevent corrosive contact with concrete.

(GPT) Gas Pipe Technician Certification Practice Test

(GPT) Gas Pipe Technician Certification Practice Test

GPT Installation Techniques 2