Screw Pump
SKPG Progressing Cavity Pump
Single screw pump for viscous media with or without solids.
View specifications →
1 model single screw to 350 degrees
Progressing Cavity Screw Pumps For Viscous And Solid Laden Liquid
Single screw pumps that move low to high viscosity media with or without solids at steady low pulsation flow, in any mounting position.
The Range
The SKPG Single Screw Pump
One model family covering low to high viscosity duties, with cast iron or stainless wetted parts and a choice of mechanical seal or gland packing.
Who Buys This Line
- Wastewater plants dosing polymer and moving thickened sludge
- Food plants moving pastes, fillings and fruit preparations
- Chemical and oil operations handling viscous media
- Any process where flow must stay steady rather than pulse
Problems It Solves
The product will not flow to a centrifugal pump
High viscosity media stall a centrifugal impeller. A progressing cavity pump carries the medium in sealed cavities from suction to discharge regardless of viscosity.
Pulsation damages the process or the instrument
The rotor and stator geometry gives steady low pulsation delivery, which matters when feeding a filter press, a dosing point or a flow meter.
There is no room for a horizontal pump
The pump can be installed in any position, which lets the layout follow the plant rather than the other way round.
Why This Line
Why A Screw Pump Earns Its Space
Solids Pass Through
A large spherical entrance port lets solid laden media enter the pump instead of bridging at the suction.
High Self Priming
Self priming to 8.5 mWS, including with air or gas liquid mixtures, so the pump recovers after the line drains.
Reversible Flow
Direction of rotation and therefore delivery flow can be reversed, useful for emptying lines and clearing blockages.
Application Scenarios
Where The SKPG Is Used
Sludge And Polymer Dosing
Feeding dewatering equipment at a controlled rate where flow steadiness decides the result.
Viscous Food Products
Moving pastes and preparations without shearing them, at a rate the filling line can take.
Oil And Chemical Transfer
High viscosity oil and chemical media, with material chosen for the liquid rather than the pressure.
Industries Served By This Line
Selection Guide
Sizing A Progressing Cavity Pump
Measure Viscosity At Working Temperature
Viscosity at the pumping temperature, not at ambient. This single number moves the model size more than anything else.
State Solids And Particle Size
The entrance port and cavity size have to suit the largest particle in the liquid.
Set Flow And Differential Pressure
Flow sets the pump size, differential pressure sets the number of stages.
Choose Seal And Material
Mechanical seal or gland packing, cast iron or stainless steel, depending on the liquid and the maintenance regime.
Answers
Progressing Cavity Pumps FAQ
What temperature can this pump handle?
The data sheet gives a maximum permissible fluid temperature of 120 degrees Celsius standard and 350 degrees on the high temperature build. State the working temperature in the enquiry so the right version is quoted.
Can it run dry?
No. The stator relies on the liquid for lubrication and will be damaged by dry running. Where the suction can empty, fit dry run protection.
Which connection is supplied?
Flanged connections are standard on this model.
How does it compare with a lobe pump?
A screw pump gives smoother, lower pulsation flow and handles higher viscosity. A rubber lobe pump takes less floor space and its wear parts change faster in place.
What wetted materials are available?
Casing and internal parts in cast iron, stainless steel or bronze, chosen for the liquid.
Engineering Notes
Guides For This Line
Maintenance Guide
Mechanical Seal Or Packing Gland How To Choose And Maintain Both
One seals better and costs more to replace. The other leaks by design and can be adjusted by anyone on site. Choose against the liquid and the maintenance team.
Read the guide →
Material Guide
SS304 Or SS316L Choosing The Grade For Tanks Pumps And Fittings
The difference is molybdenum and carbon content. What that means on your plant is chloride resistance and how the material behaves after welding.
Read the guide →Send Viscosity Flow And Solids Size
Those three numbers size a progressing cavity pump. Add the temperature and we can confirm the stator material too.