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Old 08-29-2019, 07:56 AM   #1
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Can Somebody Tell Me What This Is.

This is on a Defever 44 looks like all the cooling lines are going to it. i know
its a really vague picture but it is in the engine room molded to the hull looks to be full of water.

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Old 08-29-2019, 08:01 AM   #2
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It's called a sea chest , for intake and output of various raw water needs.
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Old 08-29-2019, 08:01 AM   #3
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It’s called a sea chest.
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Old 08-29-2019, 08:09 AM   #4
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Sea chest. If the top is above the waterline, the top can be removed and any obstructions cleared by hand. They have some benefits but if the top ever blows out, she's going to the bottom in a hurry.
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Old 08-29-2019, 08:12 AM   #5
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Greetings,
Welcome aboard. Yup, sea chest. The purpose is to eliminate all but one penetration through the hull for cooling (sea) water thus eliminating multiple, potential sources of leakage (seacocks).
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Old 08-29-2019, 08:28 AM   #6
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Thanks everybody,, A sea chest on a pleasure boat that's pretty cool,, But looks scary if that top blows off.

The boat has been sitting for 3 years in the water i should probable take the cover off and do a clean out before i start it up.
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Old 08-29-2019, 08:29 AM   #7
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Judging by the design of it, I wouldn't say that reduces leak points at all (being that the seacocks enter it below the water line), but it does allow for in-water cleaning of intakes if the top is above the waterline, which can definitely be useful in some areas.
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Old 08-29-2019, 08:34 AM   #8
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Greetings,
Mr. r. So....You've purchased this vessel? You're doing service on it? Thinking of buying it? The world wants to know!
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Old 08-29-2019, 08:55 AM   #9
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So, what, there's a big-ass rectangular opening in the bottom of the hull under this? Or there's just one intake in the otherwise regular hull bottom surface?
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Old 08-29-2019, 09:08 AM   #10
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Mr RT thinking of buying it, but it's been sitting for 3 years in salt water and hasn't been moved or ran so that's a little disturbing, but if i can get for the right price it could be a nice boat
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Old 08-29-2019, 10:01 AM   #11
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I think a sea chest would be great to have, if was designed correctly. I believe the Great Harbor 36 has one? Maybe the N37 as well?
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Old 08-29-2019, 10:36 AM   #12
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Sea Chest

The sea chest on my DF44 has a 1" thick piece of Lexan material as the cover, and is through bolted through the bottom flange with 3/8 s/s bolts & nuts, 3" on center. I don't think it is readily going to " blow off" and sink the boat.
Most of the Defevers have the sea chest top just above the water line. If we are fully loaded with fuel, water and supplies, the water level is right at the top.
To the OP, if you are considering buying this vessel, I would factor in upgrading and replacing all the thru hulls and sea cocks on that sea chest. From your pic, it seems as though there are some elbows attached to the thru hulls and then the sea cocks ; a point of failure.

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Old 08-29-2019, 10:56 AM   #13
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Greetings,
Mr. r. Thanks. A good survey should give you more information to base a decision on. Perhaps even a quick (cheap) walk through by a qualified surveyor may determine whether or not it would be wise to proceed. Spend a few $$ to possibly avoid a costly mistake.


Do you have any boating experience?
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Old 08-29-2019, 11:16 AM   #14
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Yeah i plan on getting a quick survey. Most of the surveys i have had really did give me any good info and i actually found more things wrong then the surveyor did.

Yes i have 30 to 35 years of boating experience mostly sail but were going to the dark side now. my crew has gone its separate ways so it just me and the wife.
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Old 08-29-2019, 11:54 AM   #15
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Yes a sea chest
You fill it with ice and then store your beer there
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Old 08-29-2019, 12:27 PM   #16
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Good for fishing on rainy days, too...
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Old 08-29-2019, 01:28 PM   #17
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Originally Posted by motion30 View Post
Yes a sea chest
You fill it with ice and then store your beer there
LOL Stop that. He just might follow your advice.

If the water is fairly clear and shallow, you can look and see the bottom.
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Old 08-29-2019, 01:54 PM   #18
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LOL Stop that. He just might follow your advice.

If the water is fairly clear and shallow, you can look and see the bottom.
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Old 08-29-2019, 01:57 PM   #19
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In ship and big boats there are usually two sea chests - intake and outlet. In steel boats it's usually a large pipe 6" or more with a gate valve on the top for easy opening. In port, bleach can be poured in to keep down any growth. Air pressure can push the water out. Some boats have their deck & cabin top drains plumbed to the sea chest.

In a battleship, the sea chest is about 6' across.
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Old 08-29-2019, 02:46 PM   #20
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Originally Posted by dhays View Post
I think a sea chest would be great to have, if was designed correctly. I believe the Great Harbor 36 has one? Maybe the N37 as well?
Right you are, Dave. As far as I know, all GH trawlers have it.
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