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  #21  
Old 09-16-2007
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OK

I found the pumps, I'm sorry they are 1100Gal/hour, not 1000liters/minute.

The 2 main are theses here

and the 4 in the heads are these 750Gal/hour.

Sorry for the confusion.

The check valves I use are membrane valves, and cost 3 euros each!!! In 20 years they are the best I found, and have siccessfull been using.

I replace them every year and throw away the old ones.
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  #22  
Old 09-16-2007
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Just FYI—

A 2-inch hole just 2 feet below the waterline will allow 66 gallons a minute or 3,960 gallons per hour into your boat, which is considerably more than the usual 500 gallon per hour bilge pump can handle.

Also, the 2" hole will add more than a quarter of a ton of seawater per minute. The more water that comes in, the deeper the hole goes in the water, and the faster water will come in — a vicious cycle.
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Quote:
Originally Posted by sailingdog View Post
Just FYI—

A 2-inch hole just 2 feet below the waterline will allow 66 gallons a minute or 3,960 gallons per hour into your boat, which is considerably more than the usual 500 gallon per hour bilge pump can handle.

Also, the 2" hole will add more than a quarter of a ton of seawater per minute. The more water that comes in, the deeper the hole goes in the water, and the faster water will come in — a vicious cycle.
I'll still go sailing....no worries, mate....
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This raises another question...will a submerged battery still provide power??
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Old 09-16-2007
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Quote:
Originally Posted by Giulietta View Post
This raises another question...will a submerged battery still provide power??
If it's a sealed lead-acid - yes... otherwise, after a lot of poppoing and fizzing and bad smells, probably not.

--Cameron
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Cameron—

Salt water will short out most batteries... I don't know what you're thinking... but the only difference between a sealed lead-acid, like an AGM or Gel battery, and a wet-cell, is that the sealed batteries won't produce toxic chlorine gas.
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If it's a sealed lead-acid - yes... otherwise, after a lot of poppoing and fizzing and bad smells, probably not.

--Cameron
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in other words...it does not matter what pumps you have, if your batteries are on the floor of the boat, (as most are), once water gets to them you're done...so why worry...

go sailing
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Giu-

That's what the manual pumps are for... a scared sailor can move an awful lot of water with a bucket...
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Are you sure 12 volts will have enough potential difference to produce short circuit type of amps? I would think it would only be a slight drain of current. But I don't know and haven't seen anything on this before.
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Old 09-16-2007
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Quote:
Originally Posted by Giulietta View Post
in other words...it does not matter what pumps you have, if your batteries are on the floor of the boat, (as most are), once water gets to them you're done...so why worry...

go sailing
So basically the pumps are pretty much only good for the odd spilled beer or wine then.
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