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Old 26-09-2017, 15:21   #16
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Re: My bilge is making me moist...

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Originally Posted by krisb007 View Post
Many say do have one many say don't. I prefer to keep the water from back flowing into the bilge since I have a long run to get it out of the boat. No perfect answer to this one.
I can tell you first hand I almost sunk my boat with a check valve. I was at sea and just felt like the motion of the boat wasnt right, I pulled a floor board and found water up to the board! Lucky that time. I had installed the check valve a few days prior. Sure you can spend a bunch of money on a dripless seal, second pump to extract the last tiny bit etc etc. But in the end it's a boat.
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Old 26-09-2017, 15:51   #17
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Re: My bilge is making me moist...

"They don't all use joker valves."
Just curious, which bilge pump comes with a different type of check valve?
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Old 26-09-2017, 16:10   #18
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Re: My bilge is making me moist...

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Originally Posted by Davidhoy View Post
I have a similar problem, and have been toying with an idea to keep bilges dry, and am testing a promising prototype device. On my boat I have a water-cooled refrigeration compressor that runs periodically. I was curious to see if I could plumb a small venturi pump into the discharge side of the cooling loop, and run a small tube from the suction inlet down into the bilge. With this setup, whenever the compressor is running it will be, little by little, draining the bilge overboard. I designed a venturi device in some 3D CAD software, and printed it using my 3D printer. I tested the device with a garden hose as the input, and sure enough it works, and can pump a 2-3 foot head of water. I'm experimenting with different internal geometries to see if I can get more suction, but I'm already in the ballpark for what I need. I also need to test how much back pressure or flow restriction the device introduces, so that I do not negatively affect the compressor.

It's fun to tinker like this, and I'm close to having a functional bilge drying pump that has no moving parts, uses no additional electricity, and should be largely maintenance free - just have to keep the pickup from getting clogged.

-David
I like your thinking and I'm impressed that you can make one yourself.

Some air conditioner companies make them to remove condensate from the pan. They are pretty expensive.

I used a similar device to remove rainwater from my little boat back when I was 14 or 15. The one I had was made of pot metal. I see they sell them now made of plastic.

https://www.chewy.com/python-aquariu...E&gclsrc=aw.ds

You'll have to adjust the size of yours to match the flow of cooling water you've got.
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Old 26-09-2017, 17:41   #19
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Re: My bilge is making me moist...

The original Kawasaki Jet Ski used the Jet pump to provide the motive force for a Venturi pump to dewater the engine compt.
You could enlarge the tube in the pump Venturi and pump a tremendous amount of water out of the engine compt.
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Old 26-09-2017, 17:47   #20
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Re: My bilge is making me moist...

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Originally Posted by HopCar View Post
...which bilge pump comes with a different type of check valve?
Most common bilge pumps are centrifugal pumps, like Rule, and have no check valve.
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Old 26-09-2017, 18:22   #21
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Re: My bilge is making me moist...

Besides a drain line, leaks and a sump, you could add a small pump manually controlled, that can pump to a lower water level.
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Old 26-09-2017, 18:30   #22
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Re: My bilge is making me moist...

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Originally Posted by Terra Nova View Post
Most common bilge pumps are centrifugal pumps, like Rule, and have no check valve.
That's true. I only know of two centrifugal bilge pumps that do come with a check valve. Both use joker style check valves.

I think they are pretty good as primary pumps when you have to deal with back flow from a long hose.

I'd combine them with a larger secondary pump mounted a little higher. This is the one made by Rule: LP900 Rule LoPro Series > Rule Electric Submersible Pumps > Xylem Flow Control - Let's Solve Water.
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Old 26-09-2017, 18:56   #23
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Re: My bilge is making me moist...

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Originally Posted by Cheechako View Post
I can tell you first hand I almost sunk my boat with a check valve. I was at sea and just felt like the motion of the boat wasnt right, I pulled a floor board and found water up to the board! Lucky that time. I had installed the check valve a few days prior. Sure you can spend a bunch of money on a dripless seal, second pump to extract the last tiny bit etc etc. But in the end it's a boat.
How does the check valve cause the boat to sink?
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Old 26-09-2017, 19:14   #24
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Re: My bilge is making me moist...

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Originally Posted by MarkSF View Post
How does the check valve cause the boat to sink?
By preventing the bilge pump from pumping when it inevitably fails and clogs the line.
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Old 27-09-2017, 02:45   #25
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Re: My bilge is making me moist...

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Originally Posted by Terra Nova View Post
By preventing the bilge pump from pumping when it inevitably fails and clogs the line.
Can only wonder how many boats have sunk through your scenario vs those that have sunk when a back flow siphon managed to get started due to no check valve being installed?

Of course, neither situation should ever be allowed to develop, but both systems have failure modes.

Jim
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Old 27-09-2017, 06:18   #26
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Re: My bilge is making me moist...

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Originally Posted by Jim Cate View Post
Can only wonder how many boats have sunk through your scenario vs those that have sunk when a back flow siphon managed to get started due to no check valve being installed?

Of course, neither situation should ever be allowed to develop, but both systems have failure modes.

Jim
OK please explain to me how a properly installed bilge pump and hose/ thru hull fitting can even start a siphon to back flow. Considering The thru hull fitting is supposed to be installed high enough on the hull so that can't happen.
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Old 27-09-2017, 06:31   #27
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Re: My bilge is making me moist...

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Originally Posted by newhaul View Post
OK please explain to me how a properly installed bilge pump and hose/ thru hull fitting can even start a siphon to back flow. Considering The thru hull fitting is supposed to be installed high enough on the hull so that can't happen.
The height of the thru hull fitting has not much to do with it; using a vented loop (mounted high above waterline) does prevent siphon.

An added check valve is a restriction in the line where small debris may catch and collect even more debris, effectively choking the discharge line.
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Old 27-09-2017, 06:41   #28
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Re: My bilge is making me moist...

Put in two bilge pumps. Put in your standard Rule type of centrifugal pump for pumping large volumes of water. Add a second positive displacement pump's hose right at the very lowest part of the bilge to manually remove what the Rule is not capable of removing.

I would never put a check valve on any primary bilge pump nor would I buy one with a built-in check valve. They all have the potential of sticking in the closed position. It would be okay to put a check valve on a secondary pump since if that one sticks, it does not have the potential of sinking the boat since it cannot pump much water in the first place.
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