306A Gas Piping Systems

Question 1

What is the standard test pressure for a residential natural gas piping system in Canada?

Accepted Answer

35 kPa (5 psi) for 15 minutes with no pressure drop

Answer

15 kPa (2.2 psi) for 10 minutes

Answer

100 kPa (14.5 psi) for 30 minutes

Answer

200 kPa (29 psi) for 1 hour

Question 2

What is the normal operating pressure for natural gas in a residential system?

Accepted Answer

1.75 kPa (7 inches WC)

Answer

0.5 kPa (2 inches WC)

Answer

3.5 kPa (14 inches WC)

Answer

14 kPa (2 psi)

Question 3

What method must be used to detect gas leaks in piping?

Accepted Answer

An approved combustible gas detector or soapy water solution applied to joints

Answer

A lit match or lighter

Answer

Visual inspection only

Answer

Listening for hissing sounds only

Question 4

What pipe material is most commonly used for interior residential natural gas piping in Canada?

Accepted Answer

Black steel (iron) pipe

Answer

Copper Type L

Answer

PVC pipe

Answer

Galvanized steel pipe

Question 5

What is a 'drip leg' (sediment trap) on a gas line and where is it required?

Accepted Answer

A vertical section of pipe with a cap at the bottom, installed at each gas appliance connection to catch moisture and debris before it enters the appliance

Answer

A filter on the gas meter

Answer

A device to reduce gas pressure

Answer

A noise-reducing fitting in the gas line

Question 6

What is the minimum pipe size for a gas supply line serving a single residential appliance such as a furnace?

Accepted Answer

½ inch

Answer

¼ inch

Answer

⅜ inch

Answer

¾ inch