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Old 08-19-2016, 08:53 AM   #21
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Sea strainerfor emergency pump

My boat came equipped with a strainer and valve so that the engines cooling system could be used as a pump. See attached pics.
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Old 08-19-2016, 08:55 AM   #22
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I chartered a trawler with a Y-valve and a strainer on the raw water intake. It looked like a nice setup on a single 120 Lehman. I just looked up the specs on the 6BT 210 Cummins we have, 22 GPM. Based on what I see out the exhaust that sounds about right. Either way 22 GPM (1320 GPH) isn't much for an emergency pump, but I guess every little bit helps.
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Old 08-19-2016, 09:31 AM   #23
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My Luggers pull thorough 30GPM each so I guess that would be 60GPM or one gallon per second if I had time to switch both of them over.
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Old 08-19-2016, 10:00 AM   #24
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what pics?

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Originally Posted by Gordon J View Post
My boat came equipped with a strainer and valve so that the engines cooling system could be used as a pump. See attached pics.

Sorry, for some reason, the pic did not attach.

Gordon
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Old 08-19-2016, 10:13 AM   #25
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Originally Posted by Pgitug View Post
If you use the main engine as a pump via the raw water intake, and you are a single screw vessel, increasing the speed of the boat will dramatically increase the amount of flow coming into the vessel due to water pressure on the hull.
Hmm... not sure if that is exactly true.
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Old 08-19-2016, 10:15 AM   #26
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I read an account some time ago where a guy's pumps were not keeping up. He closed the raw water intakes for his engines, disconnected the hoses and ran the engines to the yard near WOT with someone watching the water level so he didn't run the engines dry.

Don't know if that was an urban myth or not!
It's not a myth. I've done it with a pair of CATs. Saved the boat from sinking at the dock.
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Old 08-19-2016, 01:43 PM   #27
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Saw this product in our local marine store. A bit awkward but universal for a puncture.
Sta-Plug Emergency Plug


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Old 08-19-2016, 01:55 PM   #28
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Stay Afloat is a good product to carry. It will plug thru hulls, split hoses, hull cracks, etc.

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Old 08-19-2016, 02:17 PM   #29
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Stay Afloat is a good product to carry. It will plug thru hulls, split hoses, hull cracks, etc.
Interesting. All of those examples seem to be low pressure issues. I am not sure a through hull, hose, or crack failure on my boat would be that low pressure?
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Old 08-19-2016, 03:37 PM   #30
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Interesting. All of those examples seem to be low pressure issues. I am not sure a through hull, hose, or crack failure on my boat would be that low pressure?
Six feet under water would be a differential pressure on the hull of about 3psi, no?
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Old 08-19-2016, 03:40 PM   #31
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Hmm... not sure if that is exactly true.
If the leak is in the transom, the pressure might be greatly reduced. Maybe by planing or semi-planing, you could get the leak out of the water, depending where it is.
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Old 08-19-2016, 03:50 PM   #32
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I have seen that before and think it would be a good thing to have on board. I also have rescue tape on board for issues with hoses etc.... However, I have to admit that the rescue tape is stuffed into a lazarette somewhere. Not much help if I have to go hunting for it, or it is in a location that is under water. The same would be true of Stay Afloat. Only works if you can put your hands on it quickly. I really need to organize my boat better.
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Old 08-19-2016, 03:53 PM   #33
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Six feet under water would be a differential pressure on the hull of about 3psi, no?
Yes. The pressure at a through hull at the water line is zero. Figure about 0.459 psi per foot. So hull breaches are low pressure. However, at times, depending on the size of the hole, can be very high volume!
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Old 08-19-2016, 03:56 PM   #34
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Interesting. All of those examples seem to be low pressure issues. I am not sure a through hull, hose, or crack failure on my boat would be that low pressure?
Yup, the examples appear that way. I see their FAQ says:

Quote:
How much pressure can it handle?

We have tested Stay Afloat to 19.15 PSIA at 3 meters deep for 24hrs with no compromise. It also depends on how much material you use and how big the damage area is, common sense, the bigger the hole the more you use.
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Old 08-19-2016, 04:09 PM   #35
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Originally Posted by menzies View Post
I read an account some time ago where a guy's pumps were not keeping up. He closed the raw water intakes for his engines, disconnected the hoses and ran the engines to the yard near WOT with someone watching the water level so he didn't run the engines dry.

Don't know if that was an urban myth or not!
A friend of mine did this while running from New Hampshire down to Fl back in the 80s. They took the "outside" route past Georgia, were roughly 25mi offshore, big seas, hit a container. At least, that's what the coast guard said it was.
His initial indication that something was wrong was his boat doing a slow 360 while on autopilot. He reset course, reset autopilot, and a very soon the boat did another 360 turn.
He quickly went below decks and discovered water coming in through a hull puncture in near the bow. They hailed the coasties, who dispatched a helio.
In the meantime, Mike did exactly that, as the pumps were not keep up, and it was the only means he could think of to get more water out of the boat.
The helio showed up and they lowered 2 more pumps in an attempt to save the boat...even that wasn't enough.
Crew was hoisted up, and Mike was the last to go, and on the way out the last thing he did was grab his small hand-held Garmin GPS, quite the tool at that time, and stuff it in his pocket.
His crew was laying down in the main cabin due to rough seas. They said that they had heard a sort of "bump" when the boat came down off the top of a wave, but didn't really feel anything.
Think the boat was either a 38' MT or a 40' Albin.

So no, don't think it's an urban myth.
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Old 08-19-2016, 04:19 PM   #36
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Maybe not urban myth...but definitely arguable that it may be or not be practicable for many vessels.
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Old 08-19-2016, 09:42 PM   #37
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Keep in mind that the rating of a bilge pump is at ITS outlet not the end of the hose. You need smooth bore hoses which most trawlers have, plus a short run. Your outflow is actually less.
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Old 08-19-2016, 10:22 PM   #38
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I keep a heavy tarp on board with lines attached which will reach around the hull. The plan would be to drop the tarp off the bow and work it into place to cover hull damage and slow water intrusion.
Aka: fothering sail, or fothering tarp; as you like
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Old 08-21-2016, 01:09 PM   #39
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I have to admit that the rescue tape is stuffed into a lazarette somewhere. Not much help if I have to go hunting for it, or it is in a location that is under water. The same would be true of Stay Afloat. Only works if you can put your hands on it quickly. I really need to organize my boat better.
Hmm. Good point. I've got tape and some plugs and hose clamps, but couldn't tell you off-hand where they are.

Maybe I need to make a "keep-from-ditching bag" holding all this stuff in one place.
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Old 08-21-2016, 01:49 PM   #40
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You guys are way over thinking this.

just wrap that hull breach with a blue tarp.
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