Clean and Smooth Conveyance of Yogurt
NEMO® aseptic progressing cavity pump makes efficient conveying of yogurt possible
The special design ensures absolutely germ-free conveyance.
Pumping yoghurt: These are the challenges to overcome
Yogurt is one of the exceptionally demanding conveyor products in the food sector.
How to meet the highest quality standards when pumping yoghurt
All materials must be food-safe, and time-intensive cleaning must be executed to meet the high-quality standards and the associated requirements for pumping yoghurt. Therefore, in the NEMO® SA aseptic pump in bearing bracket design from NETZSCH, a flexible rod connects the drive to the shaft instead of open or oil-filled joints. This is shrunk to the rotor and the connection point. Thus the transition remains hermetically sealed, which prevents the entry of impurities. Since no components rub against each other during the connection, the flexible rod hardly wears out. As a result, you only have to deal with low maintenance costs. Stainless steel was used for the application in the dairy plant. Parts that come into contact with the product, such as the rotor, are even polished. In addition, a stator made of FDA-compliant elastomer is used. Furthermore, the mechanical seal is a double seal with a unique hygienic design on the product side. This offers you maximum product safety when pumping yoghurt and thus ensures the highest quality standards.
How to reduce your downtime when pumping yoghurt
Extensive cleaning is also necessary to maintain quality standards permanently. However, this often leads to long downtimes, resulting in high operating costs. Not with the NEMO® progressing cavity pumps, however. Thanks to the innovative design, the units offer you the CIP - "Cleaning-In-Place-Procedure" and the SIP - "Sterilisation-in-Place-Procedure" when pumping yoghurt. A bypass line and tangential rinsing nozzles ensure that the necessary flow speed of the cleaning fluid is achieved throughout the entire system. In addition, the delivery area's flow-optimised geometry prevents dead spaces and product build-up. It also enables comprehensive cleaning, including complete emptying of the pump. This means that nothing stands in the way of cleaning and even sterilising the pumps without removing them from the system. This reduces your downtime when pumping yoghurt and saves you time and money.
When setting up a new yoghurt line, a large dairy therefore decided on the NEMO® aseptic pump.
In order to meet the high hygiene requirements, it is a flexible rod, rather than open joints or joints filled with oil, that connects the drive to the shaft. This is heat-shrunk with the rotor and connection point, so that the transition is hermetically sealed. Because there is no friction between components at the connection, there is hardly any wear on the flexible rod and it needs no lubrication or seal, which means maintenance costs are very low. The materials used for the application in the dairy were stainless steel – in a polished version for the wetted parts – and a stator made of FDA-compliant elastomers, while a double mechanical seal in special hygienic design was used on the product side.
The layout of the pump was also specially designed for the CIP process: a bypass line and tangential cleaning ports ensure that the required cleaning fluid flow speed of 1.5 m/s is achieved throughout the system. In addition, the streamlined geometry of the conveying area prevents dead spaces or product deposits and enables the pump to be comprehensively cleaned and completely emptied.
To compensate for any possible fluctuations in the product flow, the pump was also combined with a variable gear and a frequency inverter. This means that the system conveys up to 20 m³ of yogurt per hour at ten bar in continuous operation without any problems – and without impairing the high quality of the demanding product.