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Old 09-14-2015, 05:35 PM   #1
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Sea Chests ???

The idea of having your seacocks all in one spot on a sea chest seems to make a lot of sense from a safety perspective. My question is why don't more builders do this? The only designs I know of that do it are Great Harbour and Defever. Surely there must be others?
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Old 09-14-2015, 05:39 PM   #2
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... and while I am asking random questions, why is it that Great Harbour and Defever designs are also the ones with big (as in stand up big) engine rooms, in boats under 50 feet? Does anybody else do big ERs under 50' ?
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Old 09-14-2015, 05:44 PM   #3
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There are others that do it. One of the downsides is that it requires all your hoses to run to that location which may not be as easy to plumb. Salt water flush heads are one that come to mind. They're often at the far ends of the boat.

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Old 09-14-2015, 06:22 PM   #4
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Tollycraft also uses sea chests in some models.
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Old 09-14-2015, 06:25 PM   #5
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Diesel Duck and Seahorse Marine have sea chests too.
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Old 09-14-2015, 07:03 PM   #6
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Quote:
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Diesel Duck and Seahorse Marine have sea chests too.
They also have a stand up engine room.
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Old 09-14-2015, 07:38 PM   #7
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I have one in mine. The pic is shown looking down on top of it, 2 thru hulls, one to engine, one to head. There's also a spare that is plugged off.
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Old 09-14-2015, 07:51 PM   #8
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Hatteras used sea chests on many of their earlier boats, then went to individual through hulls.
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Old 09-14-2015, 08:11 PM   #9
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Non-Diesel Duck Seahorses are not stand up engine rooms but they have a sea chest.
North Pacific has sea chests also.
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Old 09-14-2015, 08:27 PM   #10
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Yeah. Tell me about it.
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Old 09-14-2015, 09:01 PM   #11
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I think a twin engine applications might be more favorable for a sea-chest, as it can be mounted low in the hull and at center. Full center keels might not prohibit them, but it would require mounting them on one side or the other. I considered doing one on my own boat when it was time to change-out some thru-hulls, but with the full keel and only 3'2" draft at the bottom of the keel, it would be drawing from maybe 2.5 ft. below the waterline. When she's rolling, with multiple sources drawing water at the same time, she'd be sucking in whatever crud, grass, suds or plastic that was near the surface.

Great Harbour's have a great setup, even with only 2'10'' draft.
The sea-chest is mounted dead center at the deepest part of the hull between the engines.
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Old 09-14-2015, 09:23 PM   #12
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IIRC Nordhavn uses them on larger models, and there's a good technical article on the Nordhavn site discussing them.
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Old 09-14-2015, 10:22 PM   #13
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Quote:
Originally Posted by David Rive View Post
The idea of having your seacocks all in one spot on a sea chest seems to make a lot of sense from a safety perspective. My question is why don't more builders do this?
Money?

I am guessing that the builders know that if a buyer really is savvy enough, and particular enough to want a sea chest, they will be willing to spend more money on a boat. A production builder who is likely aiming at a different market won't bother to spend the money to do it because they can't recoup the cost from their customers.

Again, just a guess from an old sailor.

I agree though, it would be very nice to have.
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Old 09-14-2015, 11:12 PM   #14
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Pumps like AC's don't prevent reverse flow. Get a little restriction on the hull screen, and AC's cycle off, and your main engines/gennie will suck air. Not good.

Lots of plusses, but needs to be done carefully. Best for deep draw boats where there is plenty of positive head.
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Old 09-14-2015, 11:16 PM   #15
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Originally Posted by O C Diver View Post
There are others that do it. One of the downsides is that it requires all your hoses to run to that location which may not be as easy to plumb. Salt water flush heads are one that come to mind. They're often at the far ends of the boat.

Ted
This is not an issue on DeFevers. Salt water heads - can't say as I've seen one lately on DeFevers.
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Old 09-14-2015, 11:25 PM   #16
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Have three take-offs from my sea chest. One goes to the engine and the other two to nowhere. Suppose one of the unused would go to a nonexistent genset and the other for a seawater deck washdown (but the boat is plumbed for a freshwater washdown).
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Old 09-15-2015, 12:06 AM   #17
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Quote:
Originally Posted by David Rive View Post
The idea of having your seacocks all in one spot on a sea chest seems to make a lot of sense from a safety perspective.
OK. I'll bite. Why does it seem to make more sense?
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Old 09-15-2015, 06:25 AM   #18
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"Does anybody else do big ERs under 50' ?"

Todays diesel require little besides PM and oil changes.

The room to stand to observe the engine is taken from the volume of the vessel

Like a huge toilet space , are you willing to give up that much internal volume for 15 min a day.

To my mind a better design would allow an engine R&R with just minor pulling of a hatch in the cabin sole , and a similar hatch in the overhead.
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Old 09-15-2015, 08:12 AM   #19
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To my mind a better design would allow an engine R&R with just minor pulling of a hatch in the cabin sole , and a similar hatch in the overhead.
Agreed. I have hatches in the cabin sole, so good access and headroom, but no hatch in the roof.
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Old 09-15-2015, 10:01 AM   #20
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Something I read a while back that does a pretty good job of arguing that multiple seacocks are not really the problem that a lot of people imagine...

Photo Essay – August 2015 | Steve D'Antonio Marine Consulting

Not saying that I necessarily agree with him completely, but it is food for thought.
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