Plumbing Gas Piping Systems 3

Question 1

What is the safe, approved method for detecting a gas leak at a fitting or connection?

Accepted Answer

Apply soapy water and watch for bubbles

Answer

Hold an open flame near the connection

Answer

Smell each connection carefully

Answer

Use a standard electrical voltage tester

Question 2

What additive is mixed into natural gas to give it its distinctive warning odor?

Accepted Answer

Mercaptan (ethanethiol)

Answer

Methane

Answer

Propane

Answer

Carbon monoxide

Question 3

What is the maximum allowed length for a flexible gas connector hose to a residential appliance?

Accepted Answer

6 feet

Answer

3 feet

Answer

10 feet

Answer

12 feet

Question 4

Why must CSST (corrugated stainless steel tubing) gas piping be bonded to the electrical grounding system?

Accepted Answer

To protect the thin stainless steel walls from damage caused by lightning-induced electrical arcing

Answer

To increase gas flow capacity

Answer

To reduce operating gas pressure

Answer

To meet color-coding identification requirements

Question 5

What action must be completed before a gas system is returned to service after any repair?

Accepted Answer

Pressure test the system and inspect all connections for leaks

Answer

Paint all repaired sections black

Answer

Replace all valves in the system

Answer

Install a new gas meter

Question 6

Which appliance connection typically REQUIRES a flexible gas connector rather than rigid pipe?

Accepted Answer

Gas range/stove

Answer

Gas furnace with fixed installation

Answer

Gas-fired water heater

Answer

Gas fireplace insert with fixed framing

Question 7

What is the required pitch for a horizontal gas supply line to direct condensate toward a drip leg?

Accepted Answer

1/4 inch per foot downward toward the drip leg

Answer

Level with no pitch

Answer

1 inch per foot downward

Answer

2% upward slope away from the appliance