Pennwalt Super Decanter Centrifuge

An Innovation in Centrifugal Solid-Liquid Separation

The Pennwalt Super-D-Canter Centrifuge is a specially developed continuous Solid-Bowl Horizontal Scroll Discharge centrifuge for effective separation of slurries into clarified liquid and dewatered cake solid phases, with the application of centrifugal sedimentation principle.

Pennwalt Ltd. are manufacturers of Decanter Centrifuge Models P600, P660, P1500 P2000, P3000/PM20000, P3400/PM30000, PM35000 and PM36000 based on the technology acquired from Sharples Stokes Division Pennwalt Corporation-USA.

Pennwalt also supply spare parts manufactured to international standards that are interchangeable on each of the above models of the Decanter Centrifuge

Salient Features

Continuous Solid-Liquid Separation

Solids are continuously separated from the liquid phase by the application of centrifugal force ranging up to 3000 times the force of gravity, efficiently and economically. A characteristic feature of the Pennwalt Super-D-Canter Centrifuge is the cylindro-conical bowl containing within a helical/quasi-axial screw conveyor of matching profile that rotates in the same direction but at a slightly slower speed with respect to the bowl.

Extremely flexible Separations Tool

Wide ranging, process specific applications of Pennwalt Super-D-Canter Centrifuge encompass:

For a detailed list of applications where the Pennwalt Super-D-Canter Centrifuge has been successfully used click here

Economical Operation

Pennwalt Super-D-Canter Centrifuge has polymiser features, wherein the feed zone & conveyor flights are modified to reduce the floc breakage and minimise conveyor turbulence in the pool. These features result in considerably reduced dose of polymeric flocculants. In addition there is a substantial economy of space, power and labour required in the operation of the Pennwalt Super-D-Canter Centrifuge in comparison with alternative solid-liquid separations equipment.

Stainless Steel Construction designed to resist corrosion

Carbon Steel corrodes, leading to unbalance, high maintenance costs, long downtimes. Therefore the principle elements and stressed rotating components of Pennwalt Super-D-Canter Centrifuge are machined from quality centrifugally cast Stainless Steel.

Designed to resist abrasion

Sintered Tungsten Carbide Tiles positioned on the flights of the Pennwalt Super-D-Canter Centrifuge scroll (conveyor) outlast conventional hard surfacing systems many times over in any environment.

BD Feature

This makes slimy and gelatinous sludges SCROLLABLE. The BD feature allows the Super-D-Canter to operate at Ultra-Deep pond settings that compact the solids and creates hydrodynamic buoyancy that assists the scrolling and the discharge of slimy sludge. The insoluble solid contents are typically 1/2% - 2% in the feed slurry which are thickened to 6%-12% and discharged in the slimy cake.

This is a Pennwalt Super-D-Canter Centrifuge which is designed to give three separate product phases such as water, Oil, and Cake Solids. Applications encompass Olive Oil, Fish Oil, Fish Blood-Water, Slop Oietc.

Often, one or both liquid phases need to be further polished on the high-G Tubular Bowl Super centrifuge.

Sterile Features

For Pharmaceutical, Biotechnology and Food Industries, the Pennwalt Super-D-Canter Centrifuge can be provided with Sterilisation-in-place (SIP) and Clean-in-Place (CIP) features.

Safety Features

  • All electric drives are provided with enclosures of Ingress Protection (IP) ratings selected for safe operation as per process requirements.
  • The Pennwalt Super-D-Canter centrifuges are designed and featured for operational safety with Inert Gas (N2) purging to be provided by the end use customer, when operated with feed slurry containing a flammable and/or explosive solids or liquid phase.

Performance :

Four crucial factors govern the separational performance of Pennwalt Super-D-Canter centrifuges.

  • Centrifugal force required to sediment the solids.
  • Appropriate setting of the pool depth to achieve the required centrate liquid clarity.
  • Control of differential speed between the bowl and scroll, to convey the solids and obtain appropriately low cake moistures.
  • Hydrodynamic design of the conveyor to minimise turbulence.

In specifying a Super-D-Canter centrifuge, for a particular application, Pennwalt also considers other design features such as:

  • The pitch of the conveyor flights.
  • Number of Leads of the Conveyor.
  • Special Rinse or Floc Feature.
  • Feed zone design.
  • Beach angle.
  • Beach Internal Surface Profile.
  • Bowl Internal Surface Profile.
  • Torque Sensing and Over-load Protection.
  • Back-Drive or Eddy Current Brake for control of Differential Speed.
  • Casing Enclosure design.
  • Abrasion Protection with Tungsten Carbide Tiles or Stellite Hard Surfacing of the Conveyor.
  • Material of construction.
  • Sedimentation enhancing features and choice of polyelectrolyte flocculants.
  • Safety Featured casing and guards.

The correct combination of such features ensures the desired separational performance with operational safety for a given application at minimum cost. Operation at High 'G' force is an inherent design feature of the Pennwalt Super-D-Canter and provides flexibility to the user. The centrifuge can be operated at an optimum speed to suit the particular application. The Pennwalt Super-D-Canter can be operated at low, intermediate or high speed without the constraints of mechanical design, which can be optimised and tailored to suit each application.


  • Reduces Total disposal volume substantially
  • Saves space due to small foot print
  • Saves power in comparison with filtration equipment
  • Reduces handling costs
  • Produces Truckable cake solids discharge
  • Totally enclosed casing for odour minimisation and solvent loss minimisation
  • Automated Decanter Operation
  • Continuous Operation
  • Tailored to application specific requirements



The flexibility of Pennwalt Super-D-Canter Centrifuge design has proved to be effective in evolving solutions to a wide range of solid-liquid separations in the Chemical Process Industry.

However, the ideal methodology of evolving authentically tailored optional solutions to specific Solids-Liquid separational problems is to carry out laboratory settling tests, followed by trials on geometrically similar pilot scale test models of the Pennwalt Super-D-Canter Centrifuge with representative samples of process slurries that need solids-liquid separation. On the basis of the test data obtained, an accurate detailed specification of the scaled-up Super-D-Canter Centrifuge can be recommended to the potential customers.

Representative Samples

The results which are obtained in any pilot scale trials testing program can only be as good as the sample which is tested. Therefore it is absolutely essential that the sample sent to Pennwalt Ltd. for conducting trials is representative in the settling / separational and flocculation characteristics of the process slurry feed to the full-scale on-site Super-D-Canter. A similar consideration applies to the separational characteristics of representative test samples of immiscible liquids and fine solids feed sent for trials with the super centrifuge and to the test samples with representative particle size distribution of solids feed sent for trials on the Vibroscreen, which should match the separational characteristics of process feed that would be fed to the separations equipment in the full-scale plant at site.

Waste Water Treatment & Industrial Process

Waste water and industrial process applications cover a range of processes found in wide-ranging industries e.g.

Chemical Process Industry Foods | Processing Sugar Industry
Paper processing Industry Bio-Pharmaceutical &
   Fine chemical
Polymer Manufacturing
Vegetable oil-refining Municipal Effluent Treatment Industrial Effluent Treatment
Water & waste water treatment Mineral Processing Industry Mining
Potato & Root crop processing Iron & steel industry Meat rendering &
   Fish Processing Industries
Mineral, Fuel, and
   Lube Oil Process
And many more

Animal Blood Dewatering Antibiotics Anode Slimes
Industrial Effluents Inedible Tallow Di-methyl Terephtallate (DMT)
Mineral Gypsum Calcium Carbonate Meat Deboning
Tannery Effluent Chemical Intermediates Green Liquor recovery
Pharmaceuticals Nuclear Effluents Phosphoric Acid
Cutting Oils Dairy Effluent Polyelectrolyte’s
Mycelium from Fermented Broth Pigments By-product Gypsum Removal
   from Phosphoric Acid
Electroplating Solutions Enzymes Harvesting Drilling Mud Separation
Fine Chemicals Fish Liquors Manure and Farm Waste Waters
Vegetable Oils Low temperature FAT rendering Vegetable Oil Refining
   (Expellor oils)
Fruit Juices Puree Pulp Dewatering Lactose crystals
Food Processing Effluents Lactose Starch Dewatering
Brewery sludge from Aerobic
   Effluent Treatment Plant
Water Works sludge, Industrial
   Municipal Waste Treatment
Paper Mill Effluent / Clarifier
Polymer Dewatering e.g    Polystyrene, ABS Clarification & Thickening of
   Primary, Secondary, Digested &
   Heat Treated Sewage Sludge.
Optimizing sugar mill production
   by clarification of raw juice,
   sulphited juice, deliquoring cane
   mud settlings, dewatering
   phosphate cane molasses
Coal Tailings Fish Processing & Dewatering Dewatering Fruit Juices
Petrochemicals Wine Lees Caustic Lye
Distillery Stillage Whisky spent grain Ceramic Waste
Dyestuffs Blood Dewatering Human Placenta Extract
Sodium Sulphate Soya Protein Concentrate Activated and Levigated Clay
Ethanol Stillage Dewatering Soya Protein Isolate Petrochemical Plant Effluent    sludge
Titanium Dioxide Brewery Spent Grain Spent yeast from brewery
Brewers Grain Olive Oil Pipe line coal slurry
Grape/Mango/Prune/Pear Flue Gas Desulphurization And many more…


Model Operational Bowl Speed Maximum Bowl Speed Main Drive motor Power KW (Max) Back Drive Motor Power KW (Operational) Overall Dinensions (In M.M.) Net Wt. (Kg.)
RPM G-Force RPM G-Force A B C D
P-600 (semi-continuous) 5000 2100 x G


3070 x G 3.7 0.37 1510 742 593 488 230
5000 2100 x G 6000 3070 x G 3.7/5.5 0.37 1665 800 650 590 250
3880 2100 x G 4640 3060 x G 7.5 1.5 1965 1000 800 625 410
3180 2100 x G 4000 3180 x G 15 1.5/2.2 2150 1211 1018 802 1160
3180 2100 x G 4000 3180 x G 15/22 2.2 2362 1211 1018 802 1297
3180 2100 x G 4000 3180 x G 22/30 2.2/3.7 2923 1211 1018 802 1842
2800 1870 x G 3150 2360 x G 22/30 2.2/3.7 2923 1211 1018 802 2230
2800 1870 x G 3150 2360 30/37 3.7 3641 1296 1125 851 2820
Note: The dimensions given above are approximate. In our continuing efforts to update technology, we reserve the right to change specifications without prior notice.

Note :
Pennwalt Super-D-Canter centrifuges are compliant with quality requirements of ISO 9001/2008 and with the safety requirements of European EC machinery Directive: 2006/42/EC.

  • PM 20000 is the Polymiser version of Model P-3000 Super-D-Canter.
  • PM 30000 is the Polymiser version of Model P-3400 Super-D-Canter.
  • Gearbox reduction ratios are selected as per process specific requirements.
  • Material of construction of the process contact parts and the rotating bowl is S.S 316. However this can be re-considered on application specific basis as per end-user requirements.