ESCO Compressed Air Systems 2

Question 1

In a poorly maintained industrial plant, leaks commonly waste about what share of compressor output?

Accepted Answer

20-30%

Answer

DOE estimates that leaks in poorly maintained systems waste 20-30% of compressor output.

Question 2

A common rule of thumb says that lowering system discharge pressure by 2 psi reduces compressor energy use by roughly how much?

Accepted Answer

1%

Answer

For each 2 psi drop in discharge pressure, energy use falls by about 1% at full output.

Question 3

Which tool is most effective for finding compressed air leaks in a noisy plant during production?

Accepted Answer

Ultrasonic acoustic leak detector

Answer

Ultrasonic detectors pick up the high-frequency sound of turbulent leaks, even over background noise.

Question 4

Roughly what percentage of the electrical energy supplied to an industrial air compressor becomes heat that could be recovered?

Accepted Answer

80-90%

Answer

About 80-93% of compressor input energy becomes heat, and much of it can be recovered.

Question 5

In a load/unload leak test with no production demand, the compressor runs loaded 20 seconds and unloaded 80 seconds per cycle. What is the leakage as a share of capacity?

Accepted Answer

20%

Answer

Leakage % = T/(T+t) x 100 = 20/(20+80) x 100 = 20%.

ESCO - Energy Service Company Practice Test

ESCO - Energy Service Company Practice Test

ESCO Compressed Air Systems 2