Bilge pump on MS Santa Rosa. Hamburg Süd (Maersk)

Traditional bilge pump job on M. Container ship. MS Santa Rosa Hamburg Süd

For draining water from drainage wells and moving sludge from centrifuge sludge tanks, an Allweiler AEB 1 F 100 or AEB 1 E 50 progressive cavity pump is often used.
The pumps typically have to suck for a relatively long time, which in terms of pumping technology is usually considered poor working conditions. During suction, the pumps may have to work for a long time before the long suction pipes are evacuated of air. One consequence of this is dry running, which tears the surface of the rubber stator. The steel rotor is also quickly destroyed, as seen with tearing. Consequential damage to assembly parts and shaft seals is seen as collateral damage.
So why use an Allweiler progressive cavity pump under these unfavorable conditions? A little trick makes the pump long-lasting. The pump is fitted with a solenoid valve that allows small amounts of water (possibly seawater) into the pump during operation. This lubricates, cools and seals the pump internally.
The pumps are also very easy to service and only a few spare parts are required on board to get the pump running after an overhaul. Despite its very high quality, the pump is quite inexpensive in both operation and purchase.
Pump protection: Progressing cavity pumps are positive displacement pumps and should be protected against overpressure and shut-off. The pump can be protected either mechanically with a bypass line with bypass valve or electromechanically with a simple Danfoss pressure switch.

Project
Pump AEB 1F 100 1.1 kw 400 rpm
Capacity 12 m3/h
Pressure up to 6 bar
Instrumentation Danfoss solenoid valve and pressure switch

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