The original design for the milk transfer system had a lobe pump fitted; however, this wasn't performing properly and was struggling to pump the milk. In an attempt to rectify the situation, the customer had then fitted a diaphragm pump which offered a slight improvement but was still not satisfactory.

After Rotor Technical Services' pump specialist carried out an onsite inspection, it was confirmed that the diaphragm pump wasn't the correct pump for this application either. Rotor proposed a fully stainless steel Fristam Hygienic Rotary Screw pump, arranging a one-month trial to allow the customer to assess the recommended pump's performance and ensure it was entirely satisfied with it before committing to a purchase.

The trial proved successful, and the rotary screw pump offered the customer several benefits. The air required to drive a diaphragm pump is considerably more expensive than the electricity needed to drive an equivalent screw pump. Diaphragm pumps have high running costs due to failing diaphragms, non-return valves, air valves, etc. They are also notoriously difficult to clean effectively without proper operator protocols, where the rotary screw pump supplied was suitable for clean in place (CIP) procedures.

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