HBEWS-446
ⅠSpecification
Rated input power   367.5kw(500HP)
Rated stroke per minute   260 stroke/minute(260SPM)
Stroke           152.4mm(6″)
Gear Ratio         4.578：1
Max. Operation pressure    35Mpa
Valve chamber        API 4#
Max. Liner Size        6″
Max. Liner mud pressure     9.14Mpa
Dia. of suction manifold,       8″  Flange
Dia. of discharge manifold     3″ (900#) Flange
Dia. pinion shaft    95.25 mm (3.75″)
Key           22.174x15.9mm
Dimension：（No included base）, 2479X1219X1103 mm
Weight          4513 kg
 

ⅡStructure character

The pump is compact structure, small volume, lightweight, integrated herringbone gear pair, large transmit torque and smooth run.  Crankshaft is welding forged and light weight without libration.
HBEWS-446 Single-acting Triplex Pump can be used widely in oilfield operation. Liner size from 4 ¹/₂"---6" is better-adopted piston structure for workover operation and low well drilling operation. 
Power End
Frame  Frame is weld structure and anneal treatment is adopted to release weld stress to improve rigidity and strength. Bearings of crankshaft and main bearings are strengthened with ribs.
Crankshaft   Large gear rim, pitmen and bearings are installed on the crankshaft, Gear type of large gear rim is integrated herringbone. Inner hole of large gear rim and crankshaft are interference match, and are fastened with bolts & lock nuts. Large ends of pitmen are installed on the three eccentric axils of crankshaft through single-raw short cylindrical roller bearings. While small ends are installed on the crosshead pins through double raw long cylindrical roller bearings. Crankshaft is supported by two double raw annular ball bearings.
 Pinion shaft    Pinion shaft is forge alloy steel. There is a herringbone gear, which is middle hardness. In order to easy to repair, single raw long cylindrical roller bearing is adopted, which is no baffle. The two ends of pinion shaft extend to outside of the shell and pulley can be installed on each end of it.
 
Crosshead  Crosshead is spherical graphite cast iron and has good wear resistance performance. Top and bottom guide plate are adopted, and concentricity can be adjusted through bottom plate plus spacer. Connection between crosshead and central pull rod is flanged connection, which is pin-matched hole. This rigid connection can ensure concentricity between central rod and crosshead. The central rod is connected with piston rod through hub and this light hub can ensure reliable connection between them.
Fluid End
Fluid end Cylinder is alloy steel forged. Through structure design, which is valve on valve, can reduce cylinder volume and improve volume efficiency, Cylinder surface can be coated nickel to improve its corrosion resistance performance.
Valve Assembly API 4# valve is used for 446 mud pumps. Suction valve is interchangeable with discharge valve.
Liner and Piston  For mud pump with piston structure, liner & piston size from 4 1/2"、4 3/4"、5"、5 1/4"、5 1/2"、5 3/4"、6" and piston rod is conform to API 7K SA-2. Outer diameter of liner for all sizes is same and liner is fixed with cylinder through square liner head and bolts. Seal between liner and cylinder is rectangular rubber washer. 
Suction outlet There are suction outlets on both end of suction pipe and to be connected with 8″flange with O-ring 185X7 (GB/T3452.1).
Discharge outlet 3″ASME 900 flange is adopted on discharge pipe and gasket is R31 (API).
 Lubrication System
 Pressure lubrication combining splash lubrication is adopted for power end. Pressure oil pumped by gear oil pump in the oil tank is transmitted to crosshead, middle pull rod, crosshead guide and bearings through lubrication pipe line. Working condition of gear oil pump can be watched from pressure gauge in the back of the frame.  
 
 
 
 
 

Ⅲ Performance parameter table

Mechanical Efficiencyη=90%，Fill factorα=100%，Volume Efficiency:100%