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Why centrifugal pumps used for sea water cooling and lub oil pumping duties, their draw backs

Small & light for the volume of water they handle. Limited wear because very small contacts of metals.  Less maintenance and no lubrication needed.  Draw back is not self priming, but in case of sea water pumping
doesn’t require any priming, same is the case of me lo pump which is kept in tank. in case of lube oil system, two stage pumps are used to achieve require pumping pressure because low pressure developed.
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