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Old 05-02-2013, 10:13 AM   #1
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Do I need an accumulator tank?

question- just replaced my flo-jet pump 4406-143 and the paperwork says it "has a built in bypass valve eliminating the need for an accumulator tank" and not install it in a system with a tank as it would interfere with that valve. My system had a tank when I got the boat. Should I remove the tank? pump seems to work but a little slow to recover. old pump was a 4405-143
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Old 05-02-2013, 10:31 AM   #2
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The accumulator should not hurt just added protection for the pipes, and reduces the number of times the pump comes on.

The slower recover might be the difference in PSI. What PSI is the new pump and what PSI was the old. I prefer the 30 as it easier on the tubing, and wastes less water.
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Old 05-02-2013, 10:51 AM   #3
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psi is the same. just newer model of the same pump but I thought this bypass might be a new feature where the old pump may have actually required a tank and this one not?? I thought an accululator tank was to eliminate air from the lines...reducing chatter etc..
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Old 05-02-2013, 11:18 AM   #4
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If you have room in your header tank for plenty of expansion the extra accumulator tank is unnecessary.
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Old 05-02-2013, 11:37 AM   #5
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The main purpose of an accumulator tanks is to prevent quick on / off cycling of the pump. If you open a faucet just a little your pump will turn on as soon as the pressure in the line drops below a certain point but because the pump puts out a lot more water than your faucet is, the pump quickly builds the pressure back and shuts off. This can happen very fast, one second on, one second off. With an accumulator tank in the line this on/off cycle takes longer and you are less likely to damage the pump or pressure switch.

Newer designed pumps actually vary the speed of the pump to match the demand and don't need the accumulator tank. In fact it seems to confuse them.

It sounds like they are using the bypass valve to accomplish the same thing by feeding the excess water back into the intake side of the pump. I'd have to look at the pump design to figure out just what they are doing.

If you don't need the tank why not remove it and free up some space?
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Old 05-02-2013, 12:20 PM   #6
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An accumulator needn't take much space.

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Old 05-02-2013, 01:33 PM   #7
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Them pump engineers are pretty smart cookies. I'd heed their advice and lose the accumulator tank and let the pump function as designed.

I've been retrofitting many aging stationary facility plants lately and pump technology has come a long way in fifty years.
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Old 05-02-2013, 05:40 PM   #8
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thanks..will bypass the tank and see what results
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Old 05-02-2013, 07:51 PM   #9
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FWIW, I replaced my pump a couple of years ago, the new pump didn't require an accumulator tank and it seems to work well.
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Old 05-02-2013, 09:46 PM   #10
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Damn you Mark, stop posting those pictures! You make me want to gut my boat and start over.
What's with the 6 position terminal strip for only two wires? Didn't WM have a 2 position strip? I know, cheap shot, but after looking at that beautiful layout I had to bitch about something!
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Old 05-02-2013, 10:20 PM   #11
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Hopcar, I think that's for future expansion for power to up to 4 more pumps! I think it's great that Mark has a picture for everything...except pics of the inside of his beautiful Trinka.
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Old 05-02-2013, 10:24 PM   #12
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...except pics of the inside of his beautiful Trinka.
Al, remind me to dock on my starboard side later this month in Petaluma.
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Old 05-02-2013, 10:49 PM   #13
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Damn you Mark, stop posting those pictures! You make me want to gut my boat and start over.
What's with the 6 position terminal strip for only two wires? Didn't WM have a 2 position strip? I know, cheap shot, but after looking at that beautiful layout I had to bitch about something!
Hey HopCar, I was aboard and toured the Coot Saturday afternoon in Stockton. Hard to believe with as many pictures Mark shares but the photo's do not do that boat justice! I could hardly believe the robust construction and attention to detail on it.

Problem is Perla gave my wife a comprehensive tour of the Coot and she fell in love with it. I suppose it wouldn't help telling my wife there are only 6 of them and none are currently for sale...
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Old 05-02-2013, 11:04 PM   #14
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Problem is Perla gave my wife a comprehensive tour of the Coot and she fell in love with it. I suppose it wouldn't help telling my wife there are only 6 of them and none are currently for sale...
Craig, last I heard there were two more (#s 7 and 8) under construction. These are #s 5 and 6, however, pictured here:

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Old 05-02-2013, 11:08 PM   #15
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Thanks for that Mark but I think we'll just enjoy Bliss for a while. Heading up this weekend to let Jennifer start to give it the ladies touch. She said after seeing your boat she's tired of my admittedly "Man Cave" decor choice for "our" boat.
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Old 05-02-2013, 11:54 PM   #16
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Quote:
Originally Posted by HopCar View Post
Damn you Mark, stop posting those pictures! You make me want to gut my boat and start over.
What's with the 6 position terminal strip for only two wires? Didn't WM have a 2 position strip? I know, cheap shot, but after looking at that beautiful layout I had to bitch about something!
I know exactly what you mean Hopcar, whenever anyone posts engine room pics on here I cringe and feel very inferior...
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Old 05-03-2013, 04:05 AM   #17
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What's with the 6 position terminal strip for only two wires?
More to the point, why are there exposed electrical connections?

Why on Earth install a terminal strip for that purpose in the first place?
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Old 05-03-2013, 05:38 AM   #18
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More to the point, why are there exposed electrical connections?

Why on Earth install a terminal strip for that purpose in the first place?
Makes for quicker, easier changing of the water pump if it fails...? It is only 12v after all.
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Old 05-03-2013, 07:08 AM   #19
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An accumulator tank does more than soften the pumps work.

It also has to absorb the water expanded by heating hot water.

AS our boats have HW heaters of 6-10gal that mat heat from 65F to 190F (engine or noisemaker water coil) the pressure can get quite high.

I assume the non accum. pumps simply bleed the pressure back into the water source.

I do not know if thew accum. shown on Coots install has a bladder .

If not the unit must be emptied about monthly to replace the air absorbed by the water in it.
With no way to pressurize it one of the biggest advantages of an accumulator is lost.

The ability to match the tank and pump pressure and get 1-3 gal of water with out the pump operating.
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Old 05-03-2013, 07:47 AM   #20
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Makes for quicker, easier changing of the water pump if it fails...?
As opposed to a nice washdown proof Deutz (for example) or other commonly available connector that doesn't expose live electrical terminals and look like it was installed by an apprentice gardener?



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It is only 12v after all.
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