| UL |
Underwriters Lab.
|
Ultrasonic Leak Detector
|
An instrument designed to detect the ultrasonic emissions and convert them
to audible signal. |
| UNC |
Fastener Thread - Unified
national coarse. |
| UNF |
Fastener Thread - Unified
national fine. |
Unit Type Compressors
|
Compressors of 30 bhp or less, generally combined
with all the components required for operation.
|
Unload
|
An air compressor continues to run, usually at full RPM, but no air is
delivered, because the inlet is either closed off or modified, not allowing
the inlet air to be trapped. |
Unloaded Horsepower
|
The
power that is consumed to overcome the frictional losses when operating in
an unloaded condition. |
Utilization Factor
|
The
ratio in percentage of the time that the equipment is in operation to the
total working time. |
|
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