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GLOSSARY
valve or check valve can be installed on the suction line to hold product when pumping stops.
Pump Power.
Hydraulic power.
-r-
Rising Stem.
Refers to the type of gate valve in which the stem and disk rise together when the valve is opened.
-s-
Slop. Any liquid petroleum product known to be off specification; storage tanks may be reserved for such products while
waiting for analysis, reclamation, or other disposition; interfaces not disposed of in the adjacent products, or not fit
for such disposition, should be taken off in slop tanks pending disposition.
Slop Tanks.
Tanks regularly containing products which are not up to quality, or those products which are to be
treated or degraded and transferred to selected tanks.
Sludge.
A heavy sedimentation or deposit on the bottom of storage tanks consisting of water, dirt, and other settlings.
Spill. An issue of liquid outside its intended conduit or container.
Static Liquid Head
See Head and Hydrostatic Pressure.
Suction Head.
The pressure in feet of liquid or psig at the suction or inlet side of a pump.
-u-
Upstream.
Opposite to the direction of pipeline flow; contrasted with downstream or the direction of pipeline flow.
-v-
Vapor Rich Mixture.
Air-vapor mixture with a high level of fuel vapor in it.
Velocity (of flow). Rate of flow measured usually in feet per second. Equal to volume of flow in cubic feet per second
divided by the cross sectional area of the pipe in square feet.
Glossary 7
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