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

Only a verbal confirmation to the homeowner is required

Answer

A permit application to the gas utility

Answer

A warranty card for the installed equipment

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

A small leak is present in the system

Answer

The pressure gauge is faulty

Answer

The pipe walls are absorbing the pressure

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

Apply additional pipe sealant over the existing threads without disassembly

Answer

Wrap the leaking joint with self-fusing tape to stop the leak

Answer

Apply epoxy compound over the fitting to seal the leak

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

5 minutes

Answer

15 minutes

Answer

30 minutes

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

The test pressure exceeded the operating pressure by 10%

Answer

The soap solution left residue on the fittings

Answer

The pressure gauge fluctuated during initial pressurization

Question 6

A technician discovers a gas odor in a basement but the electronic detector reads zero. What is the MOST likely explanation?

Accepted Answer

The detector's sensor may be depleted or the battery is low, requiring a sensor check

Answer

There is no actual gas leak; the odor is from another source

Answer

Electronic detectors cannot detect gas odors in enclosed spaces

Answer

The gas concentration is above the upper explosive limit, saturating the detector

Question 7

When a new gas service line is installed and pressure tested, at what point is the test considered complete and acceptable?

Accepted Answer

When the system holds the required test pressure with no measurable drop for the full required hold time

Answer

When no soap bubbles appear during the initial pressurization

Answer

When the technician observes no visible pipe damage or joint defects

Answer

When the gas utility representative approves the installation verbally