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I am trying to get the right pipe size for seawater circulation system aboard a ship. The water is used to keep oysters alive while transporting them.

The system has 8 Ebara SQPB 100 pumps. The output of each pump is theoretically 1.2 m3 per minute, 4” outlet pipe, and very little head— maybe 1-2 meters. And no suction head-- the pumps are at or below the waterline.

The inlet is be from a sea chest, that feeds one large pipe that branches off into 4” pipe to each pump.

How larger should the main inlet pipe be?

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SV Savannah
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  • have you considered a water aeration system – jsotola Nov 21 '22 at 03:10
  • How is the output an area and not a volume? – Solar Mike Nov 22 '22 at 10:58
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    Size the intake based on the max output of the pumps ie 1.3 * 8. that would be the maximum condition, then consider the max allowable speed in the intake - what would be a relevant maximum? – Solar Mike Nov 23 '22 at 07:59
  • I agree with Solar Mike's suggestion. The other consideration that would be critical is how much suction lift the pumps can provide if they are self-priming during the initial start-up. It may be beneficial to upsize from the max flow basis calculation to ensure priming at the lowest sea chest liquid level (if that varies). – J. Ari Nov 23 '22 at 18:36

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