What Pump is This?

[scoobert]

Originally Posted by atoll

8000 gph! in your dreams for a 12vpump need a 220v submersible pump for that flow rate

4 pumps, 2000GPH each. plus two 500GPH pumps for the last 1/2".
https://www.boatpartsforless.com/sho...umps-2200-gph/
so 2200X4 = 8800 + 1100 = 9900GPH at 6' head.

but my 550GPH can be 1000GPH with upgrades.
so add 1000gph, over 10,000GPH, that would be a massive hole~

[HopCar]

Atoll, Rule actually made a 12 volt pump rated at 8000 GPH for many years. The darn thing had a 3" discharge and drew 40 amps. I don't think they sold a lot of them. It was actually two 4000 GPH pumps with a common discharge. They still make the 4000 GPH pumps in 12 volt.

[atoll]

there are some nifty little petrol pumps if you are going to put a hole that big in your boat!

[scoobert]

Originally Posted by atoll

there are some nifty little petrol pumps if you are going to put a hole that big in your boat!

the broken manual pump has a 2" discharge with air bleeder.
was going to use that. then was going to use the toilet discharge up front.

[HopCar]

Since you've already got a 2" discharge you could use a Rule 4000 to get you half way to your goal of 8000 GPH.
Rule 12v 4000 GPH Bilge Pump - 56D

I assume the toilet discharge is the usual 1-1/2". That would allow you to use a Rule 3700 GPH pump and you're pretty damn close to your goal with no new holes in the boat.
Rule 3700 Submersible Bilge Pump, 12 Volt, Model 14A

With big discharge hoses like these you might get a cycling problem when the water left in the hose, after the pump shuts off, flows back into the bilge. The cure for that is to mount a very small pump a bit lower than the big pumps and in most cases the big pumps will never come on and the small hose doesn't hold enough water to cause cycling.

I like that you're shooting for a high capacity bilge pumping system. I was recently on a big sport fishing boat that was taking on water. Life would have been a lot less scary if we'd had that much pumping capacity.

[scoobert]

I have seen the rule 4000, ruled them out lol.
Too many eggs in one basket.
Also rule uses a 0 discharge height for its ratings, johnny uses 6'.
So one bow one stern at 1000 for the small water, 4 2200's for a mayday. Over 10,000 gph at 6' head, wow!
The more likely event of a thru hull break even in the 2" should be covered!

[HopCar]

Scoobert, Actually the Johnson 2200 doesn't even pump 2200 GPH at 0 head. It's rated 2060 GPH at "straight discharge". Although I couldn't find it written, I think that's with the 1-1/4" hose option.

At one meter head the Johnson 2200 pumps 1900 gallons per hour which is more than the Rule 2000 which pumps 1620 GPH at one meter head.

I don't like that Johnson uses a two piece pump housing but it's not a deal breaker.
I do like the angled discharge and the 1-1/4" discharge option.
Be sure to use the 1-1/4" option to take advantage of the extra capacity.

I also like your idea of many pumps. If one fails you lose less of your total capacity.

[scoobert]

you are correct.
the small ones are rated at 3' head. the large are not.

i am not in love with johnson, just very cheep. and i am sick of hearing "my rule pump burnt out"

[atoll]

i have 5 watertight bulkheads on my boat,so when the skeg cracked the hull and put a 6inch split in the aft conpartment above the skeg,3 days from antigua i wasn't overly worried about it............the 500gph pump emtpied it in 10-15 minutes every few hours.....i was more worried about losing the rudder.............

[bobconnie]

If your that worried about de-watering your boat ! get a powerd pump and keep it where ya can start it and get BIG amounts of water out quickly !! We carry a honda 2 1/2 in outlet pump that will do the job if needed ! just a thought! cus it takes a bunch of batt power to dewater a boat!! and if ya have water aboard it might just short out your batts ! a gas powerd pump would look mighty good about then !!!

[scoobert]

Originally Posted by bobconnie

If your that worried about de-watering your boat ! get a powerd pump and keep it where ya can start it and get BIG amounts of water out quickly !! We carry a honda 2 1/2 in outlet pump that will do the job if needed ! just a thought! cus it takes a bunch of batt power to dewater a boat!! and if ya have water aboard it might just short out your batts ! a gas powerd pump would look mighty good about then !!!

its a great idea, however gasoline goes bad, and the outboard takes 2 stroke.
so now i would not only have to carry pump, but i have to fuel it, start it, run hoses, all while the boat is sinking under me... presumably in a storm.

now on the other hand they do draw a ton of power, but if the engine is not running, i can start the generator, long term 60 amps will run 3 basically forever, and if the engine is running, they could all run forever.

now imagine your in your boat 5 days into a crossing. and you get a hole. you carry 5 days of gasoline aboard?

[HopCar]

bobconnie, I really like the idea of a big crash pump as you've described but small gasoline engines drive me crazy, especially ones that sit unused for long periods.
Hondas are not as bad about this but I still don't like it. If we could just talk the Lehr propane outboard people into making a pump you could run off propane, then you'd have something.

Another option is to belt drive a nice big pump off your main engine.

Another thing I like to do is rig it so that it is easy to pump the bilge with your engine cooling pump. Every time I say that two objections come up.

"You will ruin your engine if you pump bilge water."
No I won't. But if the boat sinks it will ruin the engine.

"They don't pump enough water to be effective."
That might be valid on a small sailboat engine that uses a 3/4" pump.
They will typically pump about 400 gph, your mileage may vary.
My 1-1/4" pump will move about a 1000 gph, maybe more. I think that's worth the small expense and I don't have to make another hole in the hull.

Here is another statement that will piss people off, I don't like hand pumps.
I rarely have enough people aboard that I could spare one in an emergency to work a hand pump. I want my wife helping me stop the water coming in, even if she is just handing me tools. If I do have extra people, there are several buckets aboard.

[Stu Jackson]

Originally Posted by scoobert

its a great idea, however gasoline goes bad, and the outboard takes 2 stroke.
so now i would not only have to carry pump, but i have to fuel it, start it, run hoses, all while the boat is sinking under me... presumably in a storm.

now on the other hand they do draw a ton of power, but if the engine is not running, i can start the generator, long term 60 amps will run 3 basically forever, and if the engine is running, they could all run forever.

Have you considered NOT premixing your fuel?

In a storm you'd maybe have more things to worry about than a hole in your boat. I'd be interested in hearing from seasoned vets about what they think about the confluence of the issues scoobert is raising.

Seems to me that a quality "dewatering" system may not be "indicated" or necessary at the same time that other catastrophic issues are apparent.

Although getting a BIG hole is always a possibility.

Have you considered a BIG diesel pump, like the one the CG drops off?

I may be way wrong...been before.