sea chest sizing

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.

 

30

 

That was easy. Just make it 30 then.

 

Sorry I read it staff , my mistake

What do you mean by stuff?

 

Demand. You need to calculate demand on the chest.

 

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.

 

Sea Chest Sizing https://www.boatdesign.net/threads/sea-chest-sizing.65368/

 

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 ?

 

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.