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

The CSA B149.1 code specifies that steel pipes used for gas installations must comply with ASTM A53/A53M or A106 standards to ensure they meet the required strength and durability for safely conveying natural gas or propane.

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

As per the TSSA amendments to the CSA B149.1 code (Table 6.3), for piping systems up to 2 inches in diameter with an operating pressure up to 14 inches w.c., the minimum test pressure is 15 psig (100 kPa) for a duration of at least 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

Soldering is prohibited for joining copper tubing in gas systems because the low melting point of solder presents a significant safety hazard in the event of a fire. Approved methods like brazing, flaring, and certified press-connect fittings provide a much stronger and more heat-resistant joint.

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

Clause 6.16.9 of the CSA B149.1 code requires that when piping or tubing passes through an exterior wall, it must be protected by a sleeve. This prevents the pipe from being damaged by the masonry and allows for movement, and the ends of the sleeve must be sealed to prevent the entry of gas, water, or insects.

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

Because polyethylene piping is non-metallic and cannot be located with standard pipe locators, the CSA B149.1 code mandates that it must be installed with an electrically conductive tracer wire. This allows the underground pipe to be located in the future for service or to prevent accidental damage.

G3 - Gas Technician Level 3 Certification Practice Test

G3 - Gas Technician Level 3 Certification Practice Test

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