Canned Motor Pumps for Fisheries

As in refrigeration systems for food processing, extremely high reliability is also required when using refrigerant pumps on ships. A pump failure cannot be tolerated in the “floating cold store”. HERMETIC supports the fishing industry with hermetically sealed canned motor pumps that are characterised by their exceptionally high Mean Time Between Failures (MTBF) values and have numerous marine certificates.

Your benefits

• High availability thanks to long maintenance cycles 
• Long service life: no dynamic seals and non-contact running on hydrodynamic plain bearings 
• Marine certificates

Application areas

• Fishing 
• Fish processing

Refrigeration system on a Russian fishing boat

Requirements

When building a fishing boat in Northern Russia, an integrated refrigeration system should be installed operated with the ammonia as the transport medium. NH₃ was used for safety reasons as leakage of the coolant would be noticed immediately. Important requirements for the pump used were long maintenance cycles, a long service life, robust construction including compatibility with sea salt and the Russian RMRS marine certificate. As the ship spends long periods on the open sea, a pump failure would have catastrophic consequences for the caught fish.

The pump used

In the present case, the chosen pump was a CAMR 2/5 with AGX4.5 motor operated at 690 V and 60 Hz. This is a multistage canned motor pump with a vertical suction and discharge nozzle. The multi-stage pump series is particularly notable for high pumping heads. The pump was also equipped with marine cable. 

Decisive for the customer‘s choice of the HERMETIC pump were the optimal technical pump design, the long maintenance-free service life, the availability of the RMRS certificate and the good customer service of the HERMETIC sales team.

Medium / refrigerant

Ammonia is the primary and most widely used refrigerant worldwide. It is mainly used in large installations such as deep-freeze stores, abattoirs, breweries, central refrigeration in the chemical industry and ice rinks. The advantages of ammonia are its large specific enthalpy of vaporisation, its environmentally friendly properties and many years of experience as a refrigerant.