Our Model PAH-275 single acting triplex
drilling mud pump is 100% interchangeable with Gardner Denver PAH 275HP triplex
drilling mud pump.
The major design features of our PAH-275
pump are as follows:
1.1 The power end
1.1.1 The pump frame is of welded
whole body ductile cast iron construction. They are stress–relieved through
heat aging after welded.
1.1.2 The crankshaft is alloy ductile
cast iron and of symmetrical construction.
1.1.3 The pinion shaft is helical
gears in pair respectively. The surface of the bull gear and pinion shaft are
hard.
1.1.4 The crosshead is a one–piece
casting and runs directly in the guides.
1.1.5 All the bearings, crossheads
and guides are double lubricated with splash and force.
1.1.6 Gear lubrication pump may be
equipped aside the pump body depending on the oil pressure of lubrication line
(never lower than2.0kgduring
working).
1.1.7 The jackshaft is equipped with
double–row radial spherical–roller bearings.
1.1.8 The main bearings are
double–row radial spherical–roller bearings.
1.1.9 The crosshead is equipped with
copper bushing bearings.
1.1.10 The big end of the connecting rod runs in copper bush bearing.
1.2 The fluid end
1.2.1 The fluid end is composed of
three fluid modules (cylinders), each of which is a sectional and communicating
construction. The suction and discharge are accomplished by suction and
discharge pipes. The suction and discharge valves are vertically aligned with
each other to minimize the volumetric clearance.
1.2.2 There is clamp connection
between the piston rod and the intermediate rod, which facilitates the services
of these parts.
1.2.3 The piston liner is pressed by
the liner seat, which is attached to valve box with bolts.
1.2.4 The threaded cover of the valve
box is of acme thread connection, which facilitates the services of them.
Suction valve is supplied with valve retainer and valve guide, which facilitate
its service.
1.2.5 The taper of the valve seat is
1:6. The bottom of the seat is provided with a shoulder to be suitable for high
pressure. Conform to API Spec 7K.
1.2.6 The piston rod conforms to APE
Spec 7K. The piston is fastened with 1-1/2”locknut and is lubricated and cooled by the water
or the water with inhibitor supplied by a centrifugal spray pump.
1.2.7 There are six sizes of liners
in I.D. All these liners are the same in O.D.
1.2.8 There are two types of liners:
high-grade liner and plain liner. The high–grade liner is made of carbon steel
as a base metal, which is casted or inserted with high–chrome alloy–steel to
ensure wearability. The plain liner is made of low–carbon steel which is
carburized and quenched inside to enhance the surface hardness.
1.2.9 There are suction inlets in
front of and on both sides of the pump, which are connected to the suction
manifold. The suction flanges are of6.25”ASAB16.5-150PSI.
1.2.10 The discharge pipe and discharge flange are of 29/32” 5000PSI.
1.2.11 The discharge pulsation dampener is spherical and pre–pressured. Its
Max. working pressure is 5000PSI, and volume is 18 litres (5 gallons). The
pulsation dampener can make discharging more smooth.
1.2.12 It is advisable to equip a charging pump during operation to improve
the suction performance and raise the efficiency of the slush pump.
1.2.13 It is advisable to equip a spray pump during operation to cool the
pistons and liners so as to extend their service life.
