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What is this called ????? (RAW WATER PLUMBING)

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What is this called ????? (RAW WATER PLUMBING)

Old 10-11-2011, 04:51 AM
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Default What is this called ????? (RAW WATER PLUMBING)

A while ago there weer a few build pics, some high end center console. Basically through the sea cock it was plumbed into a box (manifold) from there it branched off to various accessories , toilet, washdown, baitwell etc..... ???????
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Old 10-11-2011, 05:06 AM
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They call it a "sea chest"
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Old 10-11-2011, 05:08 AM
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Sea Chest. I had something like that on my boat, but it was simply called a multi-port strainer. It had a 1 1/4" inlet, a 1" outlet and two 3/4" outlets. I only needed one 3/4" outlet and I replaced the whole think because the second one had broken in a way that might have sunk the boat.
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Old 10-11-2011, 05:18 AM
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Yup Thats is, thanks




So now the question, is it better to have multiple holes for individual components OR one big hole branched to multiple components ?
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Old 10-11-2011, 05:31 AM
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Originally Posted by jerseysportfisher View Post
Yup Thats is, thanks




So now the question, is it better to have multiple holes for individual components OR one big hole branched to multiple components ?
In theory, one hole. In practice, it depends.
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Old 10-11-2011, 05:32 AM
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Originally Posted by jerseysportfisher View Post
So now the question, is it better to have multiple holes for individual components OR one big hole branched to multiple components ?
I like to think the less holes in a boat the less chances for something to go horribly wrong. Less appendages (strainers) on the bottom also mean less drag so performance is increased. Sea chests have proven themselves viable for most all water intakes but have to be properly designed so one feed doesn't cause suction in another. They also have to be vented to keep from causing air locks. About the only item that doesn't do well on sea chests is AC pumps. They flow so much water continuously that it fouls up with marine growth (algae, barnacles) in no time at all.
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Old 10-11-2011, 05:37 AM
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Originally Posted by bills106 View Post
I like to think the less holes in a boat the less chances for something to go horribly wrong. Less appendages (strainers) on the bottom also mean less drag so performance is increased. Sea chests have proven themselves viable for most all water intakes but have to be properly designed so one feed doesn't cause suction in another. They also have to be vented to keep from causing air locks. About the only item that doesn't do well on sea chests is AC pumps. They flow so much water continuously that it fouls up with marine growth (algae, barnacles) in no time at all.
What if you put a strainer that could handle the flow in between the seacock and the chest. My goal here is to eliminate as many holes on the bottom of my new project boat.
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Old 10-11-2011, 05:58 AM
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Originally Posted by jerseysportfisher View Post
What if you put a strainer that could handle the flow in between the seacock and the chest. My goal here is to eliminate as many holes on the bottom of my new project boat.
Depending on the size of the chest, most builders are using either a metal or glass plate with strainer sized holes drilled on an angle to force water in as the boat moves. This plate is flush with the bottom so it creates almost no drag at all and it keeps larger debris out of the chest. Many smaller ones use the replacement plates made for larger strainers but larger ones you make by doing a lot of drilling on some G10 sheet stock.

Growth inside would not be stopped by the plate or a strainer in line and while you see a lot with plexi lids, that allows light in which accelerates that growth. What size/number of items are you trying to combine?
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Old 10-11-2011, 06:01 AM
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Originally Posted by bills106 View Post
Depending on the size of the chest, most builders are using either a metal or glass plate with strainer sized holes drilled on an angle to force water in as the boat moves. This plate is flush with the bottom so it creates almost no drag at all and it keeps larger debris out of the chest. Many smaller ones use the replacement plates made for larger strainers but larger ones you make by doing a lot of drilling on some G10 sheet stock.

Growth inside would not be stopped by the plate or a strainer in line and while you see a lot with plexi lids, that allows light in which accelerates that growth. What size/number of items are you trying to combine?
head, raw water, ac. Right now the damn boat has 6 seacock not counting engines. and half are just closed and disconnected. I would like to knock 6 down to 1. The ac will be rarely used, but i figure if there is enough of an ingress it could accommodate it.
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Old 10-11-2011, 06:06 AM
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Originally Posted by jerseysportfisher View Post
head, raw water, ac. Right now the damn boat has 6 seacock not counting engines. and half are just closed and disconnected. I would like to knock 6 down to 1. The ac will be rarely used, but i figure if there is enough of an ingress it could accommodate it.
The head is a momentary consumer so it is no problem, the AC, IF only used infrequently can be in it as well. By raw water, do you mean engine intake or washdown? Engines can be combined but they take a lot of flow you have to allow for so they don't suck the others dry. Sizes of existing through hulls and flow rates for each item would be helpful.
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Old 10-11-2011, 06:10 AM
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A little off topic, but with a seachest will the livewells free flow while running so you do not have to run the pumps? On my regulator the pumps are mounted on the thru hulls with high speed pickups. When I am running I can shut the pumps off and the wells will freeflow. I really like being able to do this because it seems like the pumps last longer.
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Old 10-11-2011, 06:33 AM
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Originally Posted by rarebreed View Post
A little off topic, but with a seachest will the livewells free flow while running so you do not have to run the pumps? On my regulator the pumps are mounted on the thru hulls with high speed pickups. When I am running I can shut the pumps off and the wells will freeflow. I really like being able to do this because it seems like the pumps last longer.
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If the seachest has enough area and angled holes it may develop enough to overcome the head pressure of the livewells but it will also flow all the other items on it too which would probably not be enough to keep baits alive. Most sea chests are designed to have just a slight amount of pressure with all the consumers on and flowing at speed. More than that and you will be possibly overwhelming the vent/bleed line and not allowing air to escape fast enough.
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Old 10-11-2011, 06:43 AM
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Hey Bill , can you buy a seachest or do they have to be custom made ?
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Old 10-11-2011, 06:50 AM
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Originally Posted by jerseysportfisher View Post
Hey Bill , can you buy a seachest or do they have to be custom made ?
I have seen some commercially available ones (like those in the pics) that are mainly used by the south Florida guys for livewell pumps but that's about it. Those require a single through hull and seacock/external strainer and are mainly to keep from airlocking livewell pumps. Built-in ones are usually done by glassing together a box of made out of G10 and glassing it in the hull and since every hull, location and demand is different, everyone usually builds their own in place.
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Old 10-11-2011, 06:56 AM
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cool, thanks for the info bill.
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Old 10-11-2011, 07:56 AM
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Here is a photo of my old strainer:



On the right side, you can see plugs for the unused outlets.

The bad news is, the threaded stud that holds the cover wrung off (on two different strainers) and this is a defect that could easily sink the boat.

So, if they had a better way to secure the cover, this would be a good strainer to serve three devices. As it is, I wouldn't install it in a boat below the waterline and I have replaced min with a different type.
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Old 10-11-2011, 08:49 AM
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Originally Posted by rwidman View Post
Here is a photo of my old strainer:



On the right side, you can see plugs for the unused outlets.

The bad news is, the threaded stud that holds the cover wrung off (on two different strainers) and this is a defect that could easily sink the boat.

So, if they had a better way to secure the cover, this would be a good strainer to serve three devices. As it is, I wouldn't install it in a boat below the waterline and I have replaced min with a different type.
great point, almost would have to close the seacock every time you left the boat. I been pooking around and graco has something similar. Also I found some rig jobs with a couple t fittings joined up after a conventional strainer
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Old 10-11-2011, 09:00 AM
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this is pretty interesting as well

http://www.cruisersforum.com/forums/...old-38148.html
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Old 10-11-2011, 09:37 AM
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Originally Posted by jerseysportfisher View Post
great point, almost would have to close the seacock every time you left the boat. I been pooking around and graco has something similar. Also I found some rig jobs with a couple t fittings joined up after a conventional strainer
The original had a flat top (both are available) the same thing happened, when I tried to remove the top to clean the strainer, the stud sheared off. This was my temporary fix until the replacement arrived.



I didn't leave the seacock on when I was not on the boat.

Honestly, I think it's a better design (but not implementation) than the original. Hold the cover on externally with a device that's not submerged in salt water.
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Old 10-11-2011, 09:54 AM
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Here's the "new and improved" replacement:
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