Pump and Fluid Systems
Chapter 6: Glossary
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MP-16 2-Piece 5000 psi January 2013
Crosshead:
A system which creates linear
reciprocating
motion
derived
from
the
crankshaft’s
rotary
motion
through
the
connecting rod. The reciprocating motion of the
crosshead is applied to the piston via the
extension rod.
Crosshead Extension:
See Extension Rod.
Crosshead Guide:
A track designed to control
and direct the movement of the crosshead.
Dampener Charging Kit:
A tool used to adjust
the pressure in the pulsation dampeners.
Degassing Equipment:
Systems designed to
remove aeration from the fluid.
De-sander:
Systems designed to remove sand
and solid contaminants from the fluid.
Diaphragm Plate:
A metal plate between the
cradle and the power frame, designed to prevent
environmental contamination of the oil in the
crankcase.
Direct Coupled Drive:
See Drive, Direct
Coupled.
Dirt Excluder:
An elastomeric guard designed to
keep dirt out of the pump.
Discharge Cross:
A flanged cross connected to
the discharge manifold allowing for the addition
of multiple lines and other systems.
Discharge Dampener:
The pulsation dampener
mounted in the discharge piping.
Discharge Line:
See Discharge Piping.
Discharge Manifold:
See Manifold, Discharge
Discharge Module:
The portion of the fluid
cylinder which discharges fluid from the pump.
Discharge Piping:
The piping which carries fluid
out from the discharge manifold. Also known as
the Discharge Line.
Discharge Pulsation Dampener:
See Discharge
Dampener.
Discharge Valve:
A valve assembly located in
the fluid cylinder, designed to channel fluid from
the cylinder to the discharge manifold and to
prevent return flow.
Drain Valve:
See Valve, Drain.
Drilling Fluid:
The fluid used when drilling wells.
Also known as Mud.
Drilling Mud:
See Drilling Fluid.
Drive System:
A system which provides power
transmission and speed reduction from the
prime mover to the pump power end. Usually
includes a manual pump rotating device.
Drive, Chain:
A drive system consisting of a
multiple strand roller chain running on sprockets.
Drive, Direct Coupled:
A drive system in which
the prime mover is directly connected to the
power end of the pump.
Drive, V-Belt:
A drive system consisting of a set
of V-Belts running on sheaves.
Eccentric Bearing:
A bearing set so that its
center is offset from a rotating axle, used to
convert rotary motion into linear reciprocating
motion via the connecting rods and crossheads.
Extension Rod:
The rod which is bolted to the
crosshead and passes through the stuffing box
to connect to the piston. Also known as the
piston extension, crosshead extension or pony
rod.
External Lube Oil Pump:
See Pump, External
Lubricating.
External Lubricating Pump:
See Pump, External
Lubricating.
Flange, Discharge Companion:
The main flange
extending from the Discharge Manifold, used to
attach the Discharge Piping and Cross.
Flange, Suction Companion:
The main flange
extending from the Suction Manifold, used to
attach the Suction Piping.
Fluid:
Any non-solid material. In this document,
unless otherwise specified the term fluid will
refer to the material being moved by the pump.
Fluid Cylinder:
A chamber in which the motion of
the pistons is imparted to the liquid, which may
consist of separate suction and discharge
modules. Also known as the Liquid Cylinder.
Fluid End:
The portion of the pump which
handles the fluid being moved. Includes the
fluid cylinder, valves and other systems. Also
known as the Liquid End.
