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Marine Pumps


Nowadays, the marine or shipbuilding industry is largely concentrated in Asia, namely South Korea, China, and Japan. Besides general cargo ships and container ships, freighters and tankers for chemicals, crude oil and other materials, cruise liners as well as yachts and other smaller ships & boats are also being built in increasing numbers.

Although the production of ships is dominated by these countries, the decisions on building and equipping the ships is often made in other countries by the owners, shipyards, operating companies or even investors.

Since the travel routes of the ships encompass the entire globe, the ships and their equipment must meet different legal requirements. In addition, the owner determines to which certification the ship should be certified. This requires a high degree of flexibility on part of the suppliers. After commissioning the ships, a high level of flexibility in service and worldwide availability of spare parts is expected of the suppliers of marine pumps in order to utilize the narrow service windows in harbors and to move the spare parts on board.

Application areas for marine pumps

Pumps can be found in all types of applications throughout the entire ship. The most important locations are in the engine room, where the fuel and oil is pumped to the motors and numerous lubricating and hydraulic pumps for all types of different sets of machines are used. Furthermore, water for operating and cooling the machines and units is also delivered.
 

Pumps for the water supply on ships

The next highly important areas are water supply and water treatment. In these areas, the generated and delivered quantities on cruise liners are considerably higher due to much higher number of passengers compared to freighters, which are under way with a small crew. But these, too, have areas where pumps are required, such as the treatment of seawater and bilge water, wastewater or ballast water treatment.
Tankers in particular have pumps for loading and unloading as well as pumps for fire protection. There are many additional tasks for pumps on all types of different ships.

Application examples for pumps in the marine and shipbuilding industry

·    Engine room / oil and fuel supply
·    Cooling of machines and units
·    Water supply
·    Wastewater / water treatment
·    Loading / unloading
·    Pumping out water
·    Fire protection / fire extinguishing equipment

Application examples for pumps in the marine and shipbuilding industry

•    (Fresh) Water
•    Wastewater
•    Seawater
•    River water
•    Fuel (mostly diesel)
•    Oil

Successful application examples

Thanks to their high flow rates radial pumps are most suitable to load the diesel, multi screw pumps are best suited to load heavy oil for the vessel. As feeder from the ships tanks and as booster pumps for the fuel oil modules mainly multi screw pumps and gear pumps are used.

Multi screw pumps are used to convey lubricants for the main engine and other aggregates.

Hydraulic fluids are used on a wide range of lifting devices, winches and other deck equipment down to steering systems and pitch propellers. To convey the liquids multi screw pumps are often used as they only reqiure limited space due to their high performance density

Fresh water is generated mainly with two methods, on the one side fresh water generation from saltwater by heating and condensation. The second method is reverse osmosis whereby salt water is pressed through a membrane with high pressure, creating a clear water permeate.

Technologies

radial pumps, progressing cavity pump

Black and grey water are treated mechanically, biologically and chemically on board.

Technologies

rotary lobe pumps, radial pumps, progressing cavity pump

The IMO regulations strictly require that only treated bilge water may be pumped out. Bilge water contains oil, sand and other contaminations. Progressing cavity pumps are ideally suited for the solid-loaden waste water, and fit well thanks to their desigeven in restricted areas next to the oil separators.
Bilgewater is pumped into a container filled with tissue. Ffine oil droplets caught in the tissue coalesce into larger droplets, which, due to their lower density, raise to the top. There the oil is collected and released through a valve, for larger amounts of oil rotary lobe pumps or multi screw pumps are used to pump the oil away.

Ballast water is used to increase the stability of the vessel, particularly in heavy weather and high waves. When the tanks of the vessel have been emptied from their liquid freight they are filled again with sea water. When the tanks shall be filled the next time the sea water is pumped out again.
While radial pumps effectively handle the large ballast water quantities pumped in and out of the tanks, rotary lobe pumps are well suited for the cleaning of the filters, the so-called "backwash", because they need no valves and the direction of flow can be changed with the rotation direction of the lobes.

To minimize the time required to load and unload the liquids, the selection of the most suitable pump type - radial pump, multi screw pump, progressing cavity pump or rotary lobe pumps - depends on the medium.

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