ESCO Compressed Air Systems

Question 1

In a typical poorly maintained industrial plant, roughly what share of compressed air output is lost to leaks?

Accepted Answer

20–30%

Answer

DOE Compressed Air Challenge data show leaks commonly waste 20–30% of compressor output in unmanaged systems. That makes a leak detection and repair program one of the fastest-payback measures.

Question 2

Rule of thumb: lowering compressor discharge pressure by 2 psig cuts energy use by about how much?

Accepted Answer

1%

Answer

The common rule of thumb is about 1% energy savings per 2 psig of pressure reduction. Lower pressure also cuts leak flow and artificial demand from unregulated uses.

Question 3

Why is compressed air called one of the most expensive plant utilities?

Accepted Answer

Only about 10–15% of the electrical input becomes useful work at the point of use

Answer

Most of the input energy to a compressor turns into heat. It takes roughly 7–8 hp of electrical input for 1 hp of useful air power at the tool.

Question 4

Which tool is commonly used to find compressed air leaks in a noisy plant?

Accepted Answer

Ultrasonic leak detector

Answer

Leaks give off high-frequency ultrasound that ultrasonic detectors can pick out even over loud background noise, so leaks can be located and tagged while production runs.

Question 5

Up to what share of a compressor's electrical input can often be recovered as usable heat?

Accepted Answer

50–90%

Answer

Since most compressor input becomes heat, packaged air-cooled or water-cooled units can let 50–90% of input be recovered for space heating, process water or boiler makeup preheat.

ESCO - Energy Service Company Practice Test

ESCO - Energy Service Company Practice Test

ESCO Compressed Air Systems