Transfer Centrifugal Pump
PHARMA FAB INDUSTRIES “ Transfer pumps are used in a variety of industries including, pulp and paper, chemical, food, beverage, pharmaceutical, and biotechnology. They are popular in these diverse industries because they offer superb sanitary qualities, high efficiency, reliability, corrosion resistance, and good clean-in-place and sterilize-in-place (CIP/SIP) characteristics.
These pumps offer a variety of Transfer options including single, bi-wing, tri-Transfer (shown), and multi-Transfer. Rotary Transfer pumps are non-contacting and have large pumping chambers, allowing them to handle solids such as cherries or olives without damage. They are also used to handle slurries, pastes, and a wide variety of other liquids. If wetted, they offer self-priming performance. A gentle pumping action minimizes product degradation. They also offer reversible flows and can operate dry for long periods of time. Flow is relatively independent of changes in process pressure, so output is constant and continuous.
Transfer pumps range from industrial designs to sanitary designs. The sanitary designs break down further depending on the service and specific sanitary requirements. These requirements include 3-A, EHEDG, and USDA. The manufacturer can tell you which certifications, if any, their rotary Transfer pump meets.
- MOC : contact parts are SS316 & non contact parts are SS 304
- Pressure Bar : 3-5kg/hr.
- Diaphragm type Pressure Gauge.
- Size : 1” to 3”
How Transfer Pumps Work
Transfer pumps are similar to external gear pumps in operation in that fluid flows around the interior of the casing. Unlike external gear pumps, however, the Transfers do not make contact. Transfer contact is prevented by external timing gears located in the gearbox. Pump shaft support bearings are located in the gearbox, and since the bearings are out of the pumped liquid, pressure is limited by bearing location and shaft deflection.
- As the Transfers come out of mesh, they create expanding volume on the inlet side of the pump. Liquid flows into the cavity and is trapped by the Transfers as they rotate.
- Liquid travels around the interior of the casing in the pockets between the Transfers and the casing — it does not pass between the Transfers.
- Finally, the meshing of the Transfers forces liquid through the outlet port under pressure.
Transfer pumps are frequently used in food applications because they handle solids without damaging the product. Particle size pumped can be much larger in Transfer pumps than in other PD types. Since the Transfers do not make contact, and clearances are not as close as in other PD pumps, this design handles low viscosity liquids with diminished performance. Loading characteristics are not as good as other designs, and suction ability is low. High-viscosity liquids require reduced speeds to achieve satisfactory performance. Reductions of 25% of rated speed and lower are common with high-viscosity liquids.
- Pass medium solids
- No metal-to-metal contact
- Superior CIP/SIP capabilities
- Long term dry run (with lubrication to seals)
- Non-pulsating discharge
Common rotary Transfer pump applications include, but are not limited to:
- Paper coatings
- Soaps and surfactants
- Paints and dyes
- Rubber and adhesives
- Food applications (a sample of these is referenced below)