RM Pumping Unit

The RM pumping unit is designed on the basis of the traditional beam pumping unit. It can change the up and down stroke time of the pumping unit and is suitable for heavy oil production.

  • Sanjack has been certified by ISO9001, API Q1, API11E, SO14001 and OHSAS18001.
  • Sanjack adopts the principle of combining API standards, national standards and users’ views for design.
  • AutoCAD and Solid Works computer software are used for drawing design. Also virtual prototype technology is used for simulation and verification of strength.

On the basis of the traditional beam pumping unit, the RM (reverse marking) pumping unit has optimized the structure of the four-bar pumping unit and designed the out-of-phase angle on the crank. The operation of the conventional beam pumping unit is limited by its own structure, which has low stability, low efficiency and high energy consumption. RM pumping units with different crank phase angles require different up and down stroke times. The longer the upstroke time, the lower the average speed of the horse’s head, which can increase the fill factor of the lower pump and extract more oil for the same unit of energy consumption. It’s more efficient and uses less energy.

The RM pumping unit changed the connection between the beams, and the tail of the beams was at a 20° Angle. According to the calculation, the structure can make the four-bar mechanism of the pumping unit run more stably, reduce the impact force of the load on the connecting bolt, and ensure the service life under the maximum impact load.

Model
RM912D-427-192 RM912D-427-168 RM912D-365-168 RM640D-365-168 RM640D-365-144 RM456D-365-120 RM456D-305-144
Basic Parameters Rated Polish Rod Capacity (lbs) 42,700 42,700 36,500 36,500 36,500 36,500 30,500
Stroke Length (in) 192/168/144/ 168/144/120 168/144/120 168/144/120 144/120/100 120/100/86 144/123/101
Max. Stroke Frequency (r/min) 8 8 8 10 10 10 10
Balanced Type Crank Balanced
Crank Direction Clockwise
Gear
Reducer
Rated Torque(in.lbs) 912,000 912,000 912,000 640,000 640,000 456,000 456,000
Model 912D 912D 912D 640D 640D 456D 456D
Gear Type Double circular arc gear reducer or Involute gear reducer
Reducing Ratio 28.79 28.79 28.79 28.363 28.363 28.255 28.255
Center Range (in) 48.43 48.43 48.43 41.34 41.34 39.37 39.37
Center Height (in) 30.91 30.91 30.91 25.98 25.98 25.59 25.59
Oil Storage quantity
(U.S. Gal)
180 180 180 106 106 100 100
Lubricant 20# Gear lubricant in winter,200# Gear lubricant in summer
Sheave Diameter(in) 50″ 50″ 50″  50″  50″  44″  44″
Sheave groove type 7C 7C 7C 6C 6C 5C 5C
Balance Assembly Weight of Cranks (Lbs) 6489×2 6489×2 6404×2 6489×2 6404×2 5651×2 5651×2
Wrist Pin bore
Positions (in)
45 45 45 45 45 38.98 38.98
36.54 36.54 36.54 36.54 36.54 31.38 31.38
28.07 28.07 28.07 28.07 28.07 23.78 23.78
Wire Line Type Φ32(6*37+IWR-1770 MPa) Φ32(6*37+IWR-1770 MPa) Φ32(6*37+IWR-1770 MPa) Φ32(6*37+IWR-1770 MPa) Φ32(6×37+IWR-1770 MPa) Φ32(6*37+IWR-1770 MPa) Φ32(6*37+IWR-1770 MPa)
Length (in) 508 460 460 460 410 350 410
Structure Unbalance (lbs) -2700 -940 -900 -900 230 590 -500
Overall Dimensions
L*W*H (in)
566×139×398 538×139×369 538×139×369 530×139×369 502×139×357 451×139×309 479×139×321

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