Energy and Utilities Natural Gas Systems 2

Question 1

What is 'peak shaving' in natural gas utility operations?

Accepted Answer

Using stored gas during high-demand periods to supplement pipeline supply

Answer

Peak shaving uses stored LNG or propane-air systems to supplement pipeline gas supply during periods of extremely high demand.

Question 2

What is the primary safety concern when excavating near underground natural gas distribution lines?

Accepted Answer

Pipeline rupture causing gas release and fire/explosion risk

Answer

Striking a gas line during excavation can cause a rupture leading to gas release, fire, or explosion, making 811 call-before-you-dig mandatory.

Question 3

Which material is commonly used for modern natural gas distribution piping in residential service lines?

Accepted Answer

Polyethylene (PE) plastic

Answer

Polyethylene pipe is widely used for gas distribution because it resists corrosion, is flexible, and is easy to fuse-join.

Question 4

What does a pressure regulator do in a natural gas distribution system?

Accepted Answer

Reduces high transmission pressure to safe delivery pressure for customers

Answer

Pressure regulators step down gas from high transmission pressure to the lower pressures safe for distribution mains and service lines.

Question 5

What is 'cathodic protection' used for in the natural gas industry?

Accepted Answer

Preventing corrosion of metallic underground pipelines

Answer

Cathodic protection uses electrical current to prevent electrochemical corrosion of buried metallic pipe, extending pipeline life.

Energy and Utilities Practice Test