Mr. Mansuri, You should ...

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Mr. Mansuri,

You should check the Offshore Technology Conference.  I have seen several vendors that had sand separators for offshore oil and gas work. 

My suggestion is to not get sand inside the intake prior to cooling.  The hydrocyclone will work, but there is an energy penalty for using it. If there is space, a settling basin should work.

Your statement about cyclones not employed in seawater, I believe, is incorrect.