The pump deals with a range of products, from chunky vegetables to cheese and yogurts to more viscous sauces.
For products such as soups where solids are suspended in a low viscosity media, the Twin Screw really excels. Customers have found that their traditional choice of a circumferential piston pump wears rapidly and is difficult to clean, whereas the twin screw performs effortlessly, without damage to the product or wear to the pump and cleaning times are much reduced.
Flowrates can be varied easily, from slow speeds for product transfer up to 4000 rpm for CIP feed and scavenge (comparable to the lobe’s 700 or 800 rpm max).
It is easily cleaned – crucial in the food industry, being described by various users and consultants as “the cleanest pump we have ever seen”.
Other benefits of the twin screw include:
- Single pump is space-saving
- very low shear to product
- low NSPH (Nett Positive Suction Head) requirement. The product feeds into the pump without any change of direction, whereas in a lobe pump the product is split and turned through 90 degrees before reaching the pressure side
- up to 30 mm solids handling
- self priming and capable of handling up to 60% air / liquid mix
- optional VarioTwin screw feeder
- dry run compatible due to contact-free operation of the feed screws and a flushed/barrier mechanical seal
- optional heating jacket
Managing Director of HpE Process Ltd Andy Allman said: “The twin screw is gradually gaining acceptance, particularly in the soft drinks industry where it is so good at moving the juice concentrates”.