GPT System Inspection & Maintenance 2

Question 1

When inspecting a gas piping system for corrosion, which condition requires immediate remediation before the system is returned to service?

Accepted Answer

Pitting corrosion that has reduced wall thickness by more than 30%

Answer

Pitting corrosion that significantly reduces wall thickness compromises structural integrity and creates a leak or rupture risk.

Question 2

A gas technician notices a pressure gauge reading that fluctuates erratically during a static pressure test. What is the most likely cause?

Accepted Answer

There is an active leak somewhere in the system

Answer

Erratic pressure fluctuations during a static test indicate gas is escaping through a leak rather than holding steady.

Question 3

Which document must a technician review before performing maintenance on a gas system in a commercial building?

Accepted Answer

The as-built piping drawings and any prior inspection reports

Answer

As-built drawings show actual pipe routing, sizes, and valve locations, which is critical for safe and accurate maintenance.

Question 4

How often must pressure relief valves on gas appliances be manually tested according to standard maintenance practices?

Accepted Answer

Annually

Answer

Annual manual testing of pressure relief valves ensures they open at the correct set pressure and have not seized.

Question 5

When using an electronic combustible gas detector during a leak survey, what action must be taken if the detector alarms?

Accepted Answer

Mark the location and immediately notify the gas utility or supervisor

Answer

An alarm indicates a potentially dangerous gas concentration; the location must be documented and escalated per safety protocols.

(GPT) Gas Pipe Technician Certification Practice Test