Twin-Screw Pumps from buzai232's blog

Twin-Screw Pumps

Bornemann Twin-Screw Pumps are self-priming, double ended positive displacement pumps with external timing gears and bearings. Manufactured in over 80 sizes, their design provides complete axial balancing of the rotating elements and eliminates all metal-to-metal contact within the pump.To get more news about MONO pump Accessories, you can visit hw-screwpump.com official website.

They can handle virtually any non-homogeneous fluid, regardless of viscosity, lubricity or abrasiveness e. g. seawater, bitumen, molasses, lime, acid, caustic solution or hydrocarbon.
Principle
While pumping there is no metal-to-metal contact within the pump housing. This allows good pumping performance even with non-lubricating and corrosive and contaminated fluids.

As the pump rotates, the intermeshing of the two screws along with the pump housing form chambers. These chambers fill with the pumped fluid and move it from the suction side of the pump to the higher pressure discharge side of the pump.

The pump is designed to allow for reverse flow by simply changing the shaft direction. The suction becomes the dis-charge and vice versa, all without any modifications to the pump
When shouldn’t you use a Twin Screw Pump?

So why not use a twin screw? About 10 years ago when twin screw pumps burst onto the sanitary pump scene, there were a few folks who only sold twin screws and did a really good job of making every application a twin screw application. Pumping Greek Yogurt? Twin screw. Mayonnaise? Twin Screw. Beer? Twin Screw. A product you’ve been handling for 20 years with an ECP pump without issue? Twin screw. You get the idea- every application between a twin screw pump application.

The reality is, twin screw pump technology, while robust and versatile, isn’t for every application. They cannot be piped inline and twin screw pumps have a large footprint. When used in high turndown applications, twin screw pumps require exceptionally large motors.

Twin screw pumps are also much more complex to service and there is less familiarity with twin screw technology among maintenance personnel than with other, more established technologies. Screws must be properly matched and timed, often requiring special training of maintenance teams. Accordingly, we don’t recommend twin screw for clean out of place applications.

Cost is also a key consideration, with twin screws costing up to 50% more than comparably sized ECP type pumps. This carries through to parts, which has a great impact on total cost of ownership. As we mentioned above, one of the reasons we love twin screw technology is it allows us to do two duties- process and CIP- with one pump. Not only does it make piping easier, it also helps make the economics work.