G3 Leak Detection and Testing Procedures 3

Question 1

What documentation must a G3 technician complete after performing a pressure test on a new gas installation?

Accepted Answer

A written test record including pressure, duration, date, and technician certification number

Answer

A written pressure test record documenting test pressure, hold time, date, and technician's certification number is required for code compliance and liability purposes.

Question 2

During a pressure hold test, the test pressure drops slightly but then stabilizes. What is the MOST likely cause?

Accepted Answer

The temperature of the test medium changed, causing pressure variation

Answer

Temperature changes cause pressure variations in a sealed gas system; a drop followed by stabilization typically indicates thermal equilibration rather than an active leak.

Question 3

If a leak is detected at a threaded fitting during testing, what is the correct repair procedure?

Accepted Answer

Disassemble the fitting, clean the threads, apply fresh approved sealant, and reassemble

Answer

Correct repair requires disassembly, thread cleaning, application of fresh approved thread sealant, and proper reassembly to ensure a reliable gas-tight seal.

Question 4

What is the standard hold time for a pressure integrity test on a residential gas piping system before the result can be recorded?

Accepted Answer

10 minutes

Answer

A minimum hold time of 10 minutes is the standard requirement for residential pressure integrity tests to allow stabilization and detect any pressure drop.

Question 5

Which condition requires a technician to tag out and NOT restore gas service after completing a leak test?

Accepted Answer

A leak is found that cannot be repaired with available tools and materials on site

Answer

If a leak cannot be repaired on site, the system must be tagged out and gas service must not be restored until a proper repair is completed by a qualified technician.

G3 - Gas Technician Level 3 Certification Practice Test

G3 - Gas Technician Level 3 Certification Practice Test

G3 Leak Detection and Testing Procedures 3