RMGA Pipeline Operations and Maintenance 3

Question 1

What is the primary hazard associated with natural gas accumulation in an enclosed space?

Accepted Answer

Asphyxiation due to oxygen displacement and explosion risk

Answer

Natural gas displaces oxygen, creating asphyxiation hazards, and within flammable limits it can explode if ignited.

Question 2

What action should a pipeline operator take when excavation damage exposes a pipeline?

Accepted Answer

Immediately stop work, evacuate, and notify the operator

Answer

When a pipeline is struck or exposed during excavation, work must stop immediately, the area must be evacuated, and the pipeline operator must be notified.

Question 3

What is the Lower Explosive Limit (LEL) of natural gas (methane) in air?

Accepted Answer

5%

Answer

The Lower Explosive Limit of methane is approximately 5%, meaning concentrations below this level will not ignite.

Question 4

What is the function of a check valve in a natural gas system?

Accepted Answer

To allow flow in one direction only

Answer

A check valve permits gas flow in only one direction and automatically prevents reverse flow.

Question 5

Which tool is used to locate underground pipelines before excavation in the US?

Accepted Answer

811 one-call system

Answer

The national 811 one-call system requires excavators to notify utilities before digging so pipelines and other buried utilities can be marked.

RMGA - Rocky Mountain Gas Association Practice Test

RMGA - Rocky Mountain Gas Association Practice Test

RMGA Pipeline Operations and Maintenance 3