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MUD PUMP PARTS LIST
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3NB-500 Triplex Piston Pump

The 3NB-500 triplex is a reciprocating, positive displacement, horizontal
single-acting piston pump which will be designed and manufactured as per API
Spec 7K. It is made up of power end, connection case, and fluid end. The power
end consists of pump housing, main shaft, bearing, cover of pump housing, tie bar,
bull gear and pinion, crosshead, connection rod, etc. The fluid end consists of
cylinder liner, piston, piston rod, fluid cylinder block, suction and discharging valve,
etc. The three parts will be attached with bolts. This pump is designed for workover

services and sidetracking


2. Main technical and performance parameters
2.1 The meanings of pump model are as follows:
3——triplex pump
NB——piston pump
500——Max. Input power of pump is 500hp(380kW)
2.2 3NB-500 piston pump parameters
2.2.1 Pump specifications
Gear Ratio……………………………………...5.043
Stroke Length…………………………………..8”(203.2mm)
Eccentricity, crankshaft………………………..4”(101.6mm)
Diameter, piston………………………………..φ140mm
2.2.2 Pump designed performance parameters
Max. Input power………………………………500hp(380kW)
Max. Pressure………………………………….4000psi(28MPa)
Max. Displacement…………………………….7.54bbl/min(1200L/min)
Max. Strokes……………………………………160 stroke /min
Overall dimensions(Length x Width x Height)……96.06″×66.93″× 40.4″
(2440×1700×1026mm)
Approximate Weight……………………………………7452lbs(3380kg)
Structural description
The 3NB—500 piston pump consists of the power end, fluid end, connection case,
lubrication system, suction manifolds, etc. (see the following figure: 3NB-500
Piston Pump assembly)
The power end is power source for mud pump and it will provide appropriate
power to the fluid end which can transfer the mechanical energy into fluid energy
to feed the water or slurry. The connection case is designed for connecting the
power end and the fluid end. The energy transferring of the power end and fluid
end can be realized through the connection rods, crosshead and pistons. The
crosshead unitizes clamp type connection to piston. The driving diagram of pump
is as follows:
Driving diagram for 500 piston pump
Main structural features are as follows:

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