Jun 17

Decanter Centrifuge can be used in many applications, like solids control system for oil drilling, mud treatment unit for sludge treatment and also can be used for water/oily waste treatment.  In order to make the centrifuge easy to lift and transport, the customer prefer to protection framework decanter centrifuge with VFD control panel and feed pump.

GN Solids Control just got Purchase Order of protection framework decanter centrifuge from drilling sludge treatment customer. After discussion, the customer confirm on high speed decanter centrifuge GNLW363BG-VFD with Netzsch brand NEMO pump for feeding & Variable Frequency Drive PLC control panel. Pls find details as below:

protection framework decanter centrifuge

1) Decanter Centrifuge: GNLW363BG-VFD

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Feb 01

What is the difference in operation between positive displacement pump and centrifugal pump?

Positive Displacement Pumpswill not p roduce the same flow at a given speed (RPM) no matter the discharge pressure.

positive displacement pump

positive displacement pump

Positive Displacement Pump must not be operated against a closed valve on the discharge side of the pump because it has no shut-off head like Centrifugal Pumps. A Positive Displacement Pump operating against a closed discharge valve, will continue to produce flow until the pressure in the discharge line are increased until the line bursts or the pump is severely damaged – or both.

The positive displacement pump can be applied as

  • rotary lobe pump
  • progressing cavity pump
  • rotary gear pump
  • piston pump
  • diaphragm pump
  • screw pump

When positive displacement pumps serve as a screw pump for feeding drilling fluids decanter centrifuge, when you change the frequency of the main motor through the VFD control panel, the treating capacity of decanter centrifuge will change, so the flow rate need to be lessed.

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Sep 14

GN designed centrifuge mud tank for oilfield and dredging project, with 1 unit of GNLW553VFD decanter centrifuge(or other model available) and Nemo pump to feed the centrifuge, the centrifuge tank is divided into 2 compartment, the mud after treated by shale shaker, desander/desilter flow or be pumped to compartment 1, then Nemo pumppumped it from the compartment 1 to the centrifuge for processing, the clean drilling mud dropped into compartment 2, which can be pumped to other application or flow to anywhere required.

centrifuge mud tank

centrifuge mud tank

In oilfield application, sometimes mud hopper unit also installed on centrifuge mud tank, the mud which will be feed to centrifuge is with solids smaller than 20 microns, it has been separated by desilter cone. After treated by decanter centrifuge, the max solids remained in the drilling fluids is smaller than 5 microns, it is called “clean mud”. The clean mud may be weighted in pill tank/compartment and mixed by mud mixing hopper & mixing pump.

In Dredging project, centrifuge mud tank is applied after dredging slurry separation system, after treated by the desander ( or sometimes desilter), the solids remained in the slurry may be too fine to be separated out by the centrifuge, so you need a flocculation tank before centrifuge mud tank. After flocculation, the mud is concentrate so It is easy for centrifuge to separate it, this is for better performance. So you have to use a positive displacement pump to pump the flocculated mud to centrifuge, otherwise the centrifugal pump will break it off. Sometimes filter press will replace the centrifuge, but efficiency of filter press is not so dissatisfied, so people use large treating capacity centrifuge instead.

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