ICC Natural Gas Systems and Safety 2

Question 1

What type of pipe is most commonly specified for new natural gas distribution main installations due to its corrosion resistance and ease of installation?

Accepted Answer

Polyethylene (PE)

Answer

Polyethylene (PE) pipe is the predominant material for new natural gas distribution mains because it is corrosion-resistant, flexible, lightweight, and can be joined using heat fusion without the need for cathodic protection.

Question 2

What is the primary function of a pressure regulator station on a natural gas distribution system?

Accepted Answer

To reduce high transmission pressure to safe distribution system pressure

Answer

Regulator stations step down high-pressure gas from transmission pipelines to the lower operating pressures used in distribution systems, ensuring safe delivery pressure to end users.

Question 3

Per 49 CFR Part 192, at what maximum concentration of natural gas in air must the odorant be detectable by a person with a normal sense of smell?

Accepted Answer

At or below 20% of the lower explosive limit (LEL)

Answer

Federal regulations require that odorant be detectable at concentrations at or below one-fifth (20%) of the lower explosive limit, ensuring leaks can be smelled well before the gas reaches a hazardous concentration.

Question 4

Which records must an ICC-certified contractor maintain and make available for inspection following any natural gas facility installation?

Accepted Answer

As-built drawings and pressure test records

Answer

Contractors must maintain as-built drawings showing actual installation details and pressure test records documenting that the required strength and leak tests were performed and passed.

Question 5

When a natural gas leak is discovered during construction or excavation, what is the immediate first action the contractor must take?

Accepted Answer

Evacuate the area and immediately notify the gas utility and emergency services

Answer

Immediate evacuation and notification of the gas utility and emergency services is the required first action, as natural gas leaks create explosion and asphyxiation hazards that require trained utility responders.

ICC - Illinois Commerce Commission Certified Contractor Practice Test

ICC - Illinois Commerce Commission Certified Contractor Practice Test

ICC Natural Gas Systems and Safety 2