Journeyman Plumbers Exam Gas Piping Systems 2

Question 1

What is the maximum allowable pressure drop for a gas piping system serving appliances on a low-pressure system (under 2 psi)?

Accepted Answer

0.5 inches water column

Answer

Low-pressure gas systems (under 2 psi) are typically designed for a maximum allowable pressure drop of 0.5 inches water column from the meter to the appliance.

Question 2

Which type of gas piping material is NOT permitted for use inside a building above grade?

Accepted Answer

Cast iron pipe

Answer

Cast iron pipe is not approved for interior gas piping above grade due to its brittleness and susceptibility to cracking under stress.

Question 3

When a gas meter is located inside a building, it must be installed in a location that is:

Accepted Answer

Ventilated and accessible

Answer

Gas meters installed indoors must be in a ventilated, accessible location to allow for meter reading, maintenance, and safe dispersal of any gas leaks.

Question 4

A sediment trap (drip leg) in a gas piping system must be installed:

Accepted Answer

Immediately upstream of each appliance

Answer

Sediment traps must be installed immediately upstream of each appliance connection to collect moisture and debris before they enter the appliance's gas valve.

Question 5

What is the minimum burial depth for a gas service line made of steel pipe installed under a public sidewalk?

Accepted Answer

24 inches

Answer

Steel gas service lines installed beneath public sidewalks must be buried a minimum of 24 inches deep to protect them from surface loads and damage.

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam Gas Piping Systems 2