Normal air
A term used for average atmospheric air at sea level in a temperature zone where it contains some
moisture It is defined in the ASME Test Code For Displacement Compressors as being at 14 696
psi A, 68 °F, 36% RH and weighing 0 075 lb./cu ft. The k value is 1 395
Oil free compressor
A positive displacement air compressor that has no oil injected into the compression chamber for
lubrication, cooling or sealing
Operating pressure
The gauge pressure at which a pressure vessel maintains a normal operation
Orifice
An opening such as a hole or vent through which air can pass, or a restricted opening placed in a
pipe line to provide a means of controlling or measuring flow
PC -Pneumatically Controlled
Pneumatic logic is a reliable and functional control method for industrial processes. Pneumatic
devices are used in processes where compressed air is the only energy source available or upgrade
cost, safety, and other considerations outweigh the advantage of modern digital control.
Piston displacement
Net volume actually displaced by the compressor piston at rated machine speed, generally
expressed in cubic feet per minute (usually CFM). For multistage compressors, the piston
displacement of the first stage only is commonly stated as that of the entire machine
PLC - Programmable Logic Control
The automation of many different processes, such as controlling machines or factory assembly
lines, accomplished with small computers called a programmable logic controller (PLC’s). This is
actually a control device that consists of a programmable microprocessor, and programmed using a
specialized computer language. A modern programmable logic controller is usually programmed
in any one of several languages, ranging from ladder logic to Basic or C. Typically, the programs
written in a development environment on a computer, and then is downloaded onto the
programmable logic controller directly through a cable connection. The program is stored in the
programmable logic controller in non-volatile memory
Pneumatic
Of, relating to, or using air moved by air pressure filled with compressed air
Pneumatics
Engineering science pertaining to gaseous pressure and flow
Pneumatic tools
Tools that operate by air pressure
Point of use
Single outlet or limited number of outlets in a building used to connect tools or equipment to the
air system
Positive displacement compressors
Compressors in which successive volumes of air or gas are confined within a closed space and
compressed and may be either reciprocating or rotating (trap air and then squeeze it to the desired
pressure)
PSI - Pounds per square inch
Pressure
Force per unit area, usually expressed in pounds per square inch (PSI) or BAR
Pressure dew point
Temperature at which moisture begins to condense in a compressed air system
PSI
Pounds per square inch
PSIG
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