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Go Back   SailNet Community > On Board > Gear & Maintenance > Bilge pump non return valve.
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Thread: Bilge pump non return valve. Reply to Thread
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Topic Review (Newest First)
06-19-2014 12:37 PM
alctel
Re: Bilge pump non return valve.

I have a check valve on my low capacity 'dry-bilge' pump and then none on the higher up, bigger capacity 'oh ****' pump.

If the low capacity pump jams im not that bothered - ill notice at some point and fix it. I want the 'oh ****' pump to be worked at all times though (its wired direct to the battery, while the little lower one is wired to a 3 way switch/breaker)
06-18-2014 09:55 PM
tommays
Re: Bilge pump non return valve.

The ONLY DRAIN on the Cal 29 is 1" and can clog with an errant potato chip

At lest the J24 has TWO 1-1/2 scuppers
06-18-2014 07:31 PM
captain jack
Re: Bilge pump non return valve.

Quote:
Originally Posted by tommays View Post
Well

My Cal 29 would most certainly have and issue IF the cockpit drain clogged and there was a big rain storm
i believe IF is the telling word, there. as i said, without my extended absense or gross negligence, i simply don't see it getting clogged up.
06-18-2014 08:58 AM
tommays
Re: Bilge pump non return valve.

Well

My Cal 29 would most certainly have and issue IF the cockpit drain clogged and there was a big rain storm
06-18-2014 06:41 AM
captain jack
Re: Bilge pump non return valve.

Quote:
Originally Posted by HUGOSALT View Post
captain jack,
The way i see it, if you take on some water and settle down in the
stern a little your drain well will help you for a little while...but then if you settle further,
with your bilge pump emptying in the boat rather then outside...well not a good
situation. ...Thinking Titanic.
Maybe set up ok to pump out rain water, with a 2nd bilge pump exiting transom.
that is thinking 'titanic'. the drain is around 6" to 8" above the water. if i take on enough water to make the boat sit that low, my bilge pump, although the one recommened for my size boat, will never be up to the task of saving the day.

i suppose, thinking with such an ultimate calamity in mind, if i decide to blue water sail my 27' cal, i will need to think about getting a much larger bilge pump and route it out through the transom.

here, in the bay, i can't think of anything that would let that much water fill my bilge short of a hull breech. my bilge pump will most definately not keep her afloat in that sort of situation...regardless of how i route the hose. i have to wonder how many non-blue water sailors' boats have bilge pumps that could deal with that kind of situation.
06-18-2014 06:07 AM
captain jack
Re: Bilge pump non return valve.

Quote:
Originally Posted by transmitterdan View Post
Cockpit drains can be plugged by debris (leaves, bugs, etc.). If that happens then you have to ask does the bilge pump system still work?

Most boats won't sink if the cockpit drain is plugged. The cockpit is usually designed so it will not hold that much water. But if the cockpit is also the bilge drain then probability of sinking goes up.
if this cockpit drain was like the ones on my holiday 20, i'd agree with that possibility. however, it's not. it is much larger in diameter. bugs would never be able to clog it...well, maybe prehistoric bugs or a few of those giant madagascar cockroaches washing down to the drain all at once. i am at the boat every week, often more than once, and am thinking about doing the live aboard thing. it would take a bit of seriously gross negligence for the drain to get clogged with anything. i have never measured the hole but i'm betting it's over and inch and it has no tunnel that could get clogged. it's just a hole in the bottom of the transom.

i suppose in some sort of case of extremely odd circumstance that might be a concern but, i really don't see that as being a likely event...not on this boat.
06-17-2014 08:55 PM
transmitterdan
Re: Bilge pump non return valve.

Cockpit drains can be plugged by debris (leaves, bugs, etc.). If that happens then you have to ask does the bilge pump system still work?

Most boats won't sink if the cockpit drain is plugged. The cockpit is usually designed so it will not hold that much water. But if the cockpit is also the bilge drain then probability of sinking goes up.
06-17-2014 08:47 PM
HUGOSALT
Re: Bilge pump non return valve.

captain jack,
The way i see it, if you take on some water and settle down in the
stern a little your drain well will help you for a little while...but then if you settle further,
with your bilge pump emptying in the boat rather then outside...well not a good
situation. ...Thinking Titanic.
Maybe set up ok to pump out rain water, with a 2nd bilge pump exiting transom.
06-17-2014 06:22 PM
captain jack
Re: Bilge pump non return valve.

Quote:
Originally Posted by Boredop View Post
So you ran your pump outlet to somewhere not outside of your boat? Does anyone else think this is a bad idea?
it's not run to a place inside of the boat. it's run to the cockpit and dumps right in the cockpit drain well. there is a well, on the boat ( what you are seeing in the picture ) just in front of the transom, that is for the purpose of collecting any water that gets into the cockpit. at the bottom of this well, a little above water level, is the cockpit drain. it's a fairly good sized drain hole.

the bilge pump dumps the water into this well, and it runs right out of the cockpit drain hole.

and it works beautifully. when i bought the boat, it had no hatchboard or companionay hatch ( the first two things i made for the boat ) because it had been abandoned and the marina had to break into it. it had water in the bilge because of rain. no interior water damage but, water in the bilge. i installed the pump, ran the hose, and turned it on. it worked perfectly. it was several gallons of water and it was flawless. no problems.

the boat has never taken on a drop of water, since i fixed the issue of having a completely open companionay. however, the first test of the set up worked so well i don't need another.

the beauty of the way i ran it is that i don't ever have to worry about the through hull dipping below the waterline and letting water come back into the bilge. in fact, if there is enough water in the cockpit to let that happen, back flow through the bilge pump through hull ( which doesn't actually go through the hull ) is going to be the least of my worries.

at first, i was going to run it through the hull. then, i started really looking at it and asked myself why. not every boat has such a well in front of the transom. so, my solution probably wouldn't work for evetryone. but, if you have an early cal 27, the pop top type, it ill.
06-17-2014 03:38 PM
tommays
Re: Bilge pump non return valve.

First and foremost as a land pump person my electric pumps are there for a convince

That being said I have a high pump and a low pump in a small deep section of the Cal 29 bilge

Both pumps have siphon breaks well above the waterline (rub rail) height and the deep pump has the jabsco check valve which is needed due to the tiny capacity of the deep section

The valve works fine

Of course I also have to manual pumps BUT there also only going to cover minor things as unless you have seen water with a small amount of head pressure geyser out off a 2" hole you have no idea how fast things flood
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