1.
Hydraulic System Terms.
The following terms are presented to aid in
the understanding of petroleum terminology. Definitions of these terms will
add to the understanding of the terminology used in this lesson.
a. Brake horsepower:
The
amount
of
measurable
after
deduction for friction loss.
b. Efficiency (%): The efficiency expressed in the percent at which a
pump operates at a specific RPM.
c. Emergency head capacity:
Pressure in FTH which a pumping unit
produces at the maximum rate of discharge.
d. Feeder (flood) pumps:
Pumps generally installed to supply the
required suction pressure between tank farm installations and main line
(trunk) pump stations or to feed fuel through short branch lines to
dispensing tankage installations.
e. Head:
An expression of pressure, usually stated in terms of inches
or feet.
f. Dynamic head:
A measure of pressure in liquids in motion.
g. Feet of head:
The measure of pressure in terms of the height in
feet of a column of liquid of a given fuel.
h. Static head:
A measure of pressure in liquids at rest; pressure
produced with a column of liquid because of weight alone.
i. Impeller:
A device, which impels or pushes forward, such as the
rotor of a centrifugal pump or air compressor.
j. Incremental pressure:
The difference between the suction
and
discharge pressure of a pump or of a multipump pumping station.
k. Parallel connection:
The arrangement of two or more pumps to
discharge their cumulative output at the discharge pressure of one pump.
l. Series connection:
The arrangement of two or more pumps to
discharge the output of one pump at the cumulative discharge pressure of all
pumps.
m. Stage:
Grade, level, or step, as in the case of liquid passing
through an impeller of a pumping unit with more than one impeller.
n. Throughput:
Capacity, quantity transported per unit of time, BPD,
GPM/GPH.
3
QM5201
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