New gear pump design enhances efficiency for polymer pump



The demands on plants, processes and equipment are constantly increasing. So to live up to the demand for greater efficiency, higher throughput and lower reject rates, Witte Pumps & Technology GmbH has completely overhauled its Booster and Poly pump ranges.

Poly series (left) and Booster series (right)

The result is a redesign that impacts on all core components: friction bearings, housings and gear shafts have all been modified. From a technical perspective, this has meant real advantages in terms of conveying properties and product qualities thanks to the reduced heat input, lower shear and shorter dwell times of the polymer in the smelting reactor. What’s more, the optimised gear shafts and modified housing geometry facilitate significantly higher throughputs than with pumps of the same footprint in the previous design. This in turn allows for increases of up to 40 % without changing the installation size.

The core components of both series – friction bearings and gear shafts – are interchangeable.

The Poly series also offers high flexibility when it comes to installations beneath the polymer melting reactor. Pump operator can choose from three different flange geometries.

  • In the basic version (SX), the flange geometry is integrated into the housing. This option is the most cost-effective for operators and requires the least amount of installation space. T
  • he version (MX) featuring blind holes in a flange that protrudes over the housing offers the maximum cross section to ensure the lowest possible pressure losses. This version is generally used for extremely highviscosity polymers. The range is rounded off with a flange with through holes.
  • This version (LX) offers maximum installation flexibility with only minimal pressure loss.

All sizes and flange geometries are available with connections that comply with EN 1092-1 and ANSI B16.5. It goes without saying that the company also offers housing variants for replacing existing pumps and debottlenecking, not to mention solutions for special requirements based on operator requests. By standardising on three gear widths for each centre distance, the distances between the respective pump sizes have been significantly reduced.

The new gear geometries facilitate differential pressures of up to 320 bar for selected pump sizes. The pump portfolio now spans from 611 to 21,500 cm³/revolution to cover all common polymer applications. An expansion of the range is set to be rolled out gradually.

Witte will showcase these pumps at at this year’s K Messe, which will be taking place in Düsseldorf, Germany from 16–23 October at booth E40 in Hall 10.


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