Piping and Tubing Systems Flashcards
6 cards from real G3 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Piping and Tubing Systems flashcards as text
What is the standard test pressure for new residential gas piping?
Answer: 15 psi
The standard is 15 psi, well above normal operating pressure of about 0.25 psi.
What type of pipe thread sealant is approved for gas connections?
Answer: Yellow Teflon tape or approved gas-rated pipe dope
Only sealants rated for gas service should be used, such as yellow Teflon tape.
What is a drip leg (sediment trap) on a gas line?
Answer: Collects moisture, dirt, and debris before they reach appliance controls
A drip leg collects contaminants that could damage the gas valve.
What is CSST and its special installation requirement?
Answer: Corrugated Stainless Steel Tubing; proper bonding/grounding
CSST is flexible gas piping requiring electrical bonding to protect against lightning.
What is the minimum burial depth for underground gas piping in Ontario?
Answer: 18 inches (450 mm)
CSA B149 requires 18 inches (450 mm) below finished grade.
Why must gas piping be properly supported at specified intervals?
Answer: To prevent sagging, joint stress, and potential leaks from movement
Proper support prevents sagging, joint stress, and movement-caused leaks.