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PCS-421B Auto Density Control Double Pump Cementing Skid
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PCS-421B Auto Density Control Double Pump Cementing Skid
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Tel: 0086 716 801 6585
Address: Jingzhou city, hubei province jingzhou area xihuan road
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The model of PCS-421B is a skid mounted complete mixing and pumping unit. This unit is state-of-the-art in mixing and density automatic control.
It mainly consisting of seat, two engines, two transmission boxes, twoTPA400 triplex pump, hydraulic system, air system and ACM-III auto mixing system. The drive of HEMI system is from two transmission boxes PTO, the skid is compact and suit to offshore drilling. 
This unit mainly used in oilfield cementing, fracturing, oil well pressure testing, and other fluid pump in offshore, on land or desert.


Weight21.5 t
Dimension24 ft (L) x 8.2 ft (W) x 10.33 ft (H)
Max.Pressure10,000 psi (with 3 3/4" fluid end)
Max.Flow20.6 bpm (w/2 5"fluid end)
Density Range8.32-22.5 ppg ± 0.2 ppg
Mixing Capacity0 ~ 12.6 bpm
Working Temp.-30ºC ~ 50ºC
Working Time>2 hours (under; >3 hours (under max.flow)

EngineCaterpillar C13 475 HP@2100 RPM (2sets)
caterpillar C15 540HP@2100RPM (optional)
Detroit S60 475HP@2100RPM (optional)
HydraulicAllision 4700OFS (5 forward shifts+empty shift) (2sets)
HydraulicTransmission PTO driven. closed loop for c-pumps, open loop for agitators
Triplex pump (2sets)
Model No.SERVA TPA400
Max. brake HP400 BHP (294Kw)
Chain Case Ratio27:40
Gear Ratio25:108
Fluid End3 3/4”4 1/2”5”
Rated Pressure69 MPa48.3MPa38MPa
Max. flow rate0.92 m³/min1.34 m³/min1.64 m³/min
ACM-III.1mixing system
Mixer typeHigh energy recirculation mixer
Dry cement ValveOff- center linear metering valve
Water pumpSERVA 4X3X11 (1.5 m³/min@0.78MPa)
Recirculating and boost pumpSERVA RA56 (3.7 m³/min@0.45MPa) (two sets)
densitometerMicro Motion 3” F300 non-radioactive densitometer
controlsAB industrial micro processor
Mixing tub8 BBL (1.4 m³)Fuel tank900 L
displacement2X10 BBL (2X1.5 m³)Hydraulic tank170 L
  Air tank80L


  1. patent right of high energy mixing system

  2. Patent right of off-center dry cement valve, avoid from bulk-blocked

  3. Emergency kill system of engine is used for air inlet shutoff

  4. Big pump’s over-pressure protect idle system

  5. SPS’s non-leakage packing system

  6. Spare mixing system to meet the urgent

  7. non-radioactive densitometer, less cement-blocked, safe and reliable

  8. Adapt to oilfield work custom, simple operation steps

  9. 10 inches large size of display, easy to input data and test

  10. portable wireless or wire data collecting system

  11. Engine auxiliary coldstart, pneumatic and hydraulic start


  1. Engine: Detroit diesel S60 475hp@2100rpm

  2. Radiator and fan cooling system,or sea water cooling system available.
  3. ACM-IV density control system ( ACM-III + tub level control)
    ACM-V density control system
  4. Auxiliary hydraulic power pack.
    Engine: CAT C7(300hp@2200rpm)
    Weight: 2.4t
    Dimension: 9ft x 4ft x 6ft

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