Pump and Fluid Systems
Chapter 6: Glossary
weatherford.com
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MP-16 2-Piece 5000 psi January 2013
Chapter 6: Glossary
Adjusting Nut:
See Gland
Aeration:
Air suspended in the fluid.
AGMA:
The American Gear Manufacturers
Association.
Bearing:
A device that supports, guides, and
reduces the friction of motion between fixed and
moving machine parts.
Bearing Carrier:
A device that fits around a
bearing and allows for easy adjustment.
Bearing Housing:
The outer shell of a bearing,
designed to protect, support and contain the
other elements.
Bearing Roller:
Bearing elements which move
along a fixed track inside of the housing,
reducing friction, controlling movement and
helping to absorb shocks and stresses.
Bearing,
Connecting
Rod:
See
Bearing,
Crankpin.
Bearing, Crankpin:
A bearing which transmits
the oscillating reciprocating load transmitted by
the connecting rod to the crankshaft. Also
known as the connecting rod bearing.
Bearing, Main:
The bearing which supports the
crankshaft and absorb the liquid and inertia
loads that are developed by the pistons as they
displace the fluid. Also known as the main
crankshaft bearing.
Bearing, Main Crankshaft:
See Bearing, Main.
Bearing, Wrist Pin:
The bearing which attaches
the connecting rods to the crossheads and
allows the circular motion of the crankshaft to be
transformed into an oscillating force on the
crossheads. Sometimes known as the Wrist Pin
Bushing.
Breather:
A vent which allows for pressure
equalization between the inside and the outside
of the pump.
Bull Gear:
See Main Gear.
Bypass Line:
A length of piping leading off the
main line used to vent excess pressure from the
pump.
Bypass Valve:
See Valve, Bypass
Cage (Guard):
A safety system consisting of a
wire-mesh cage which surrounds and prevents
access to potentially hazardous systems or
components.
Cavitations:
The sudden formation and collapse
of low pressure bubbles in fluid.
Chain Drive:
See Drive, Chain.
Charging Pump:
See Pump, Charging.
Come-A-Long:
A device for gripping and
shortening the effective length of a cable, wire
rope or chain by means of two jaws which close
when one pulls on a ring.
Connecting Rod:
A rod which articulates the
motion of the crankshaft to the crosshead.
Power is transmitted through the combination of
compression and tension.
Connecting
Rod
Bearing:
See
Bearing,
Crankpin.
Cooling Loop:
A device designed to reduce fluid
temperatures by pumping a coolant through a
loop of hose or piping to absorb heat from the
fluid, and then through a second loop to
disperse the heat into the environment.
Cradle:
The portion of the pump which connects
the fluid end to the power frame. Also known as
the Frame Extension.
Crankcase:
See Power Frame
Crankpin Bearing:
See Bearing, Crankpin.
Crankshaft:
The stepped shaft which transmits
power and motion to the connecting rods
through eccentric rotation. Main bearings and
connecting rods are fitted to this component.
