G3 - Gas Technician Level 3 Piping and Tubing Systems Questions and Answers

Question 1

According to the CSA B149.1 Natural Gas and Propane Installation Code, what is the required material specification for steel gas piping?

Accepted Answer

ASTM A53/A53M

Answer

ASTM A120

Answer

ASME B31.3

Answer

CSA Z245

Question 2

A gas technician is installing a new natural gas line for a residential furnace. The system operates at a standard pressure of 7 inches water column. Before connecting the appliance, what is the minimum required test pressure for this new piping system?

Accepted Answer

15 psig for a minimum of 15 minutes

Answer

5 psig for 10 minutes

Answer

1.5 times the operating pressure for 30 minutes

Answer

100 psig for 15 minutes

Question 3

Which of the following joining methods is NOT permitted for use with copper tubing in a natural gas or propane piping system?

Accepted Answer

Soldering

Answer

Brazing

Answer

Flared fittings

Answer

Press-connect fittings

Question 4

A G3 licensed technician is tasked with running a gas line through a solid concrete foundation wall to an outdoor appliance. What is a critical requirement for this type of installation?

Accepted Answer

The pipe must be at least Schedule 80 thickness.

Answer

The pipe must be painted yellow for identification.

Answer

The pipe must be sleeved and the annular space sealed.

Answer

A union fitting must be installed inside the wall.

Question 5

When installing an underground polyethylene (PE) gas pipe, which of the following is a mandatory requirement according to the CSA B149.1 code?

Accepted Answer

A tracer wire must be installed with the piping.

Answer

The pipe must be buried at a minimum depth of 36 inches.

Answer

The pipe must be encased in a sand bed at least 6 inches deep.

Answer

Heat fusion is the only acceptable joining method.

Question 6

What is the primary purpose of installing a sediment trap (drip leg) in a gas piping system?

Accepted Answer

To collect moisture, dirt, and other foreign particles.

Answer

To provide a convenient point for pressure testing.

Answer

To automatically shut off the gas flow in an emergency.

Answer

To regulate the gas pressure just before the appliance.