sea chest sizing

A

AAM

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Hello everyone , How can I determine a rectangular sea chest size for a crew boat 30 m ?
 
By how much stuff you need to put in it.
 
That was easy. Just make it 30 then.
 
Allow for future additional demands and possible marine growth/clogging.
Overkill is your best friend for any raw water intake.
I see far too many sea chests that do not use strainers, big mistake.
 
fallguy said:
Demand. You need to calculate demand on the chest.
Click to expand...

Can you be more specific?

I tried A=Q/v to calculate the cross sectional area but I don't know if it's right or wrong?,
And I am not sure of the range of the velocity ?
 
kapnD said:
Allow for future additional demands and possible marine growth/clogging.
Overkill is your best friend for any raw water intake.
I see far too many sea chests that do not use strainers, big mistake.
Click to expand...
I read that the strainer should be at least 1.5 times the area of the inlet valve
But I am not sure how to calculate the volume of the sea chest or based on what ?
 
The needs for everything that will get water from the intake is what you need to calculate. There is no way to help you unless you get that value. Also, the location and spacing of the intakes have to assure that a large intake with high velocity is not starving a small one. Strainers should be calculated based on the total area of the openings, and type. For example, a strainer with small round holes will have less flow than one with longitudinal vanes, even though they both have the same free area.
 
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