Alfa Laval OS Twin Screw Pumps

Introduction

The Alfa Laval Twin Screw Pump combines process duties typically handled

by positive displacement with Cleaning-in Place (CIP) duties typically

handled by centrifugal pumps. This provides a robust and reliable platform

that offers greater process flexibility.

Designed for process flexibility, the Alfa Laval Twin Screw Pump is built on

a robust, reliable platform that meets stringent hygienic standards. It is

capable of handling both product transfer and CIP. Its low pulsation

characteristics and excellent solids-handling capability reduce the risk of

product damage, thereby improving product quality.

The pump is designed according to the most stringent hygienic design

standards and with verified, effective CIP.

Applications

Designed for handling sensitive, abrasive and high and low viscosity fluids,

the Alfa Laval Twin Screw Pump is ideal for use in hygienic applications

across the dairy, food, beverage, and home and personal care industries.

Quiet and virtually pulse-free, the pump provides smooth and gentle

operation, making it an excellent choice for handling sensitive products.

Two-in-one operation provides easy handling of process media of varying

viscosities as well as CIP fluids. This simplifies piping and pump control,

cutting costs and minimizing contamination risks.

Superior suction performance with excellent lift capability and low NPSHr

provides installation flexibility and increases product recovery.

The Alfa Laval Twin Screw Pump is available in sixteen models based on

four frame sizes. Each frame is available with an assortment of different

screw profiles for varying pressure, flow and solids-handling capabilities.

Benefits

• Greater process flexibility.

• Ease of service, increased process uptime.

• Robust reliable design, reducing cost of ownership and increasing

process uptime.

• Improved product quality.

• Exceptional hygiene and cleanability.

Standard design

All media contacting steel components, like pump casing, front cover and

feed screws are in W. 1.4404 (AISI 316L). Furthermore, the pump casing

is diffusion hardened. A stainless steel gearbox, end cover and foot ensure

increased life and assist in washdown.

The gearbox is designed with the timing gears located between the bearing

sets, rather than external to them. This allows the bearing location to be

optimized in order to provide maximum support to the shaft assembly,

thereby providing a robust rigid design. The internal gearcase design

optimizes oil circulation to both sets of bearings and the timing gears with

an oil sump design. This improves the lubrication effect on both bearings

and timing gears, minimizing the energy produced due to friction and

thereby reducing heat generation within the pump gearbox.

The front-loading, self-setting cartridge design makes it easy to replace

the shaft seal while the pump is in place. Single, single flush and double

mechanical cartridge seals are available. All options are fully front-loading

and interchangeable.

The Alfa Laval Twin Screw Pump can be supplied either as a bare shaft

pump or mounted on a base plate complete with coupling, guard, shroud

and a direct coupled motor or a gear motor for easy, plug-and-play installation.

Working principle

The Alfa Laval Twin Screw Pump is a positive displacement ump. As the

pump rotates, the intermeshing of the two contra-rotating screws, along

with the pump casing, form volumetric chambers. These chambers fill with

the pumped fluid and move the fluid axially from the suction side of the

pump to the higher pressure discharge side.