New running water system finally working !

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Gypsy
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Sailboat: MacGregor 26X
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New running water system finally working !

Post by Gypsy »

During one of the worst heat waves , I can remember , Admiral and I have been installing a water system in our :macx:

We now have two Plastimo tanks under the bow berth , a small one on the starboard side and a larger one on the port side for a total of 39 gallons of water .

I installed a thruhull Perko water fill as high up under the galley sink as I could get and teed both bladders to this , so that they fill at the same time. Before I drilled thru the hull , I added glass to the area to thicken the hull , so as to prevent any cracking , it worked as there was no problem , it made a clean hole.

The output lines run to a 'on demand' pump , that I mounted under the seat forward of the galley .
I glassed a board from the top of the ballast tube to the side of the hull and mounted the pump on it.

I teed the output lines together to go to the pump then teed the hot and cold side of the faucet together , so you get water no matter which way you turn the control handle.

I wondered how the boat was going to handle with 300lbs plus of water in the bow , if anything she seems to handle better , less "wandering" or so it seems. She isn't listing to the bow .

It might raise the stern out of the water when the Admiral and me get in this berth !

The bladders filled nicely , they are laying on top of some 1/4" silicon rubber mats , that I put down to lessen any chaffing .

Our only complaint is how noisy the pump is , when it runs , and how it cycles off/on/off/on if you turn the water on just a little . At present we don't have a front on our galley , perhaps after we get this enclosed it will lessen the noise .
I'm not sure if the pump has a way to reduce the water pressure or not , will look into that .

Overall we are very pleased with the system !
tchariya
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Re: New running water system finally working !

Post by tchariya »

Man...post some pics to help us enjoy your handy work!
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Russ
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Re: New running water system finally working !

Post by Russ »

Awesome. Yea, some pics would be nice.
Gypsy wrote: Our only complaint is how noisy the pump is , when it runs , and how it cycles off/on/off/on if you turn the water on just a little . At present we don't have a front on our galley , perhaps after we get this enclosed it will lessen the noise .
That's the trick. Vibrations telegraph well through fiberglass. It's pretty hard to avoid the noise.


--Russ
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kmclemore
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Re: New running water system finally working !

Post by kmclemore »

Mine is mounted on soft rubber mounts... definitely cuts down the "thrrump-thrrump", but not entirely.
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sctodd
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Re: New running water system finally working !

Post by sctodd »

I went to the local hardware store and bought a small pressurized tank to avoid the on/off/on problem. Tank is only about a foot high and works really well
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grady
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Re: New running water system finally working !

Post by grady »

sctodd wrote:I went to the local hardware store and bought a small pressurized tank to avoid the on/off/on problem. Tank is only about a foot high and works really well
An accumulator tank makes the system work a lot better. I installed one in my motor home and it made big difference in operation.
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kmclemore
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Re: New running water system finally working !

Post by kmclemore »

Careful - some pumps *cannot* be used with an accumulator tank... Check the installation instructions or the label on the pump.
vizwhiz
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Re: New running water system finally working !

Post by vizwhiz »

Do they give any reason for that? I sell pumps for a living...big ones, mind you, but the principles are all the same.
I actually think an accumulator should work great in a boat system - especially when the quantities used are low and infrequent. If there is a significant reason for why not, I'd like to know what it is cuz I'm scouring the brain for why not... (I could speculate on why they would say that, but could not say definitely...)

So I think I'll speculate (cuz my brain is running now)...

For example, some of these water pumps are Jabsco - if they are the same type of Jabsco that Jabsco is famous for, then they are the little flexible rubber star-shaped pumps (called flexible vane pumps) like you have a bigger version of at the bottom of your outboard motor (or the kind they call "drill motor pumps"). In a tiny size, it might be pressure limited, so using an accumulator might allow the system to reach a higher pressure than the pump is designed to handle. Also it would leave the downstream side of the pump pressurized at all times, which the pump may not be made to have (pressurized constantly) and so the seals might leak more quickly in the pump or the pump might spin backwards relieving the pressure and causing it to start again. Or, the motor may not be sized to start the pump against a fully pressurized system, which will burn your motor up more quickly than starting the pump with no pressure on the discharge. Any of these could apply to the Jabsco pumps because they are positive displacement pumps...or any pumps that are positive displacement (rigid vane pumps, roller pumps, gear pumps, etc.)

For a small centrifugal pump, the only reason I could think of for not using an accumulator would be an issue of pressure. They are made for moderate pressure (not as high as the vane pumps, typically) and if you have the accumulator set to too high a pressure (which you pumped in with your tire pump) then you could cause the pump to run for long periods trying to reach the high pressure which it could never reach and you'd burn up the motor or seal. But that would be the only real issue with using a centrifugal pump with an accumulator...just have to make sure the system reaches a pressure relatively quickly then shuts off.

(After all this, the reason will be something stupid...I just KNOW it!) :?
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Gypsy
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Re: New running water system finally working !

Post by Gypsy »

I don't know the brand of pump I have , right off , bought it at Marine Liquidators in Ft Pierce Fl .

Not sure if pressure can be adjusted down or not , but if it can , does anyone think adjusting it down will lessen the off/on cycling ?

Rigt now the water spews and splashes , coming out of the facet , at full pressure .

The pump came with rubber grommets to bolt thru , I might put a 1/2" rubber pad between these grommets and the board to try and dampen the noise.
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