NGA 70 Properties Of Natural Gas And Abnormal Operating Conditions Practice Test

What is the machine that compresses gas to a higher pressure to make up for pressure drop along the pipeline?

Compressor Station Emergency Shutdown System (ESD) Excess Flow Valve Heaters

Correct Answer:

Compressor Station

Explanation:

In natural gas pipelines, gas loses pressure as it flows because of friction and changes in elevation. To maintain flow and meet downstream pressure requirements, the gas is compressed back up to a higher pressure at intervals along the line. The machine that does this is a compressor station, which houses compressors driven by turbines or electric motors. By boosting the pressure, the station offsets the pressure drop and keeps the gas moving efficiently. The other options don’t fit this function: an Emergency Shutdown System is a safety mechanism to stop the line, an Excess Flow Valve limits flow if it’s too high, and heaters raise temperature rather than pressure.

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