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GLOSSARY
-m-
Manifold.
A piping arrangement which permits a stream of liquid or gas to be divided into two or more streams, or
which permits several streams to be collected into one. See Header.
Module.
An identifiable section of a facility that can be installed as a unit and, under certain circumstances, be
operated as a unit.
-o-
Off-Specification Product.
A product which fails to meet one or more of the physical, chemical, or performance
requirements of the specification.
Operating Pressure.
The pressure at which a system is designed to operate safely. Equipment is normally pre-tested
to 1-1/2 to 2 times the operating pressure to ensure adequate safety margins.
-p-
Packed Line.
A petroleum hose line or pipeline filled with product under pressure from the pump station against a
closed line valve.
Pad. The earth or concrete foundation on which equipment is placed.
Petcock.
A small drain for releasing air or fluid.
Pipeline Batch.
The quantity of product pumped into the pipeline in one continuous operation.
Plot Plan.
A dimensioned layout of major equipment involved in a system.
POL. Petroleum, Oil and Lubricants.
Pressure Drop.
The decrease of pressure in pounds per square inch, or head in feet, of a fluid flowing in a piping
system from one point to another point downstream from the first point. Pressure drop may be caused by friction,
increase of elevation, or increase of velocity.
Priming.
Displacement of air on the suction side of a centrifugal pump between the source of supply and the point of
intake in the pump. Priming can be done by filling the pump casing with product to be pumped or by removing the
air with a vacuum pump. A foot
Glossary 6
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