| OEM |
Original equipment
manufacturer. |
Off Gas
|
Air or vapor
given off or expelled as a byproduct or result of an operation or treatment
process. |
| Oil Aerosol |
A suspension
of fine solid or liquid particles in a gas. |
Oil Bath Filter
|
A
labyrinth type filter having the active surfaces continuously splashed with
oil. Most pollutants are absorbed by the oil which when circulated releases
its pollutants, which sink by gravity to the bottom of the oil pan. |
Oil Free
|
A term that
generally applies to the condition of the air either when it leaves the
compressor, or after filtration. An oil-free compressor will have no
lubrication on the compression side of the machine. However this may not
result in oil-free compressed air, simply due to the fact that the ambient
air being sucked into the compressor will contain hydrocarbons which will
condense into liquid oil further down stream. |
Oil Free Compressor
|
A
positive displacement air compressor which has no oil injected into the
compression chamber for lubrication, cooling or sealing. |
Oil- Less
|
Compressors that contain no oil;
e.g., small reciprocating
compressor with PTFE piston rings and PTFE bearer rings, sealed for life
bearings and no sump oil would be called an oil-less compressor. |
Oil System
|
Consists of a vessel which is a combination of oil sump and oil separator,
an oil cooler, and an oil filter. |
Operating Pressure
|
The
gauge pressure at which a pressure vessel is maintained in normal operation.
|
| Operating Pressure Burst |
Above this pressure, the system may rupture or burst. |
Orifice
|
An opening such
as a hole or vent. An opening through which air can pass, or a restricted
opening placed in a pipe line to provide a means of controlling or measuring
flow. |
| OSHA |
Occupational Safety
and Health Administration. |
| Overhung Type Centrifugal
Compressor |
A single inlet compressor with the impeller or impellers
mounted on an extended shaft of the driver. |
Overpressure Accumulation
|
The permitted increase in pressure developed after the valve has opened.
Usually expressed in percentage, ie.; 3% accumulation (A.S.M.E. Code,
Section I). Flows through safety/relief valves are officially determined at
these overpressure conditions. |
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