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The Norfolk Broads Forum / Broads Boat Owners Q & A / Pressure tank
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Posted By Discussion Topic: Pressure tank

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BuffaloBill
Jun-11-2018 @ 5:10 PM                           Permalink
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Mardles sometimes
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We have a pressure tank fitted inline with the water
output pipes from the tank but it appears to not be
working. We had a new tank so it must have been drained
down but not re-pressured. There is a 'foot pump'
connector on the back but I can't find anything on it
to tell me what to pump it up to.
Any idea's?

The older I get...
The better I was....!!


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Captain-Joshie
Jun-11-2018 @ 6:10 PM                           Permalink
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Hi Bill

I think I’ve got a manual in my boat info box, after my evening meal which is just being served up, I’ll have a look for it.

But I think it prepressurised to you pump pressure.

John.

Kind regards, John(Captain
Joshie), Jo & Toby.
'Braveheart' L68 Broom
30/Skipper

Steve51
Jun-11-2018 @ 6:39 PM                           Permalink
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Mardles sometimes
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Bill, have you checked the pressure? Draining any part of the plumbing wouldn't de-pressurize the accumulator. The bit with the Schrader valve is separated from the water side by a membrane. You may have air pressure in the accumulator, but your nrv may be letting by. If no pressure, I would start with two thirds of the pump pressure and adjust if necessary to prevent the pump from cycling.  Smile

Steve. CM1 and NR12

Paladine
Jun-11-2018 @ 6:48 PM                           Permalink
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BB, your tank looks like the Jabsco (re-badged?). Full instructions here. Draining the water side should have no effect on the pressurised air side. Was it working before the water tank was replaced?


"..for the avoidance of any doubt, the broads are not legally a national park and do not come under the national park legislation, and nor will they."
Parliamentary Under-Secretary of State for DEFRA (Hansard 2015)

Captain-Joshie
Jun-11-2018 @ 7:19 PM                           Permalink
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Hi Bill

Found it! Having had a nice tea  Smile  .

My accumulator is precharged to 0.8 bar (12psi), it also has a max operating pressure of 12 bar.

My accumulator is a ‘Johnson Pumps SPX 2 litre unit

I’ve photographed the main page.

Hope this helps.

John. Smile

Kind regards, John(Captain
Joshie), Jo & Toby.
'Braveheart' L68 Broom
30/Skipper


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BuffaloBill
Jun-11-2018 @ 7:31 PM                           Permalink
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Thanks for all the replies. I 'seem' to remember it
working Ok when we got the boat but it's been so long
since.....  Mad  
I think the best thing to do is measure the pressure in
the tank before deciding on the course of action, if one
is needed.

The older I get...
The better I was....!!

annville
Jun-12-2018 @ 1:45 PM                           Permalink
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Hi Bill It looks like it is connected incorrectly the pipe from the tank should go to the  pump inlet then outlet hose should go to accumulator, then outlet from accumulator goes to supply ie taps/hot water tank.And the tank should be mounted vertically if posible.John



This message was edited by annville on Jun-12-18 @ 1:58 PM

Paladine
Jun-12-2018 @ 3:48 PM                           Permalink
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annville, this is one of those rare occasions when I disagree with you. It looks to me as if the accumulator is correctly installed. That is, if I interpret the photo correctly. I've written my interpretation on the modified photo (attached).

The water doesn't actually flow through the accumulator, the membrane in it just acts as a buffer to smooth the pump's pressure changes (and stores a certain amount of pressure in the system, which can be used to prevent the pump cycling).

There are mounting points for it to be fixed vertically or horizontally. It doesn't make any difference to the performance, but it can save a bit of space if mounted vertically.

"..for the avoidance of any doubt, the broads are not legally a national park and do not come under the national park legislation, and nor will they."
Parliamentary Under-Secretary of State for DEFRA (Hansard 2015)


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annville
Jun-12-2018 @ 5:43 PM                           Permalink
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If the water tank is indeed the lower one it is plumbed correctly.The reason for fitting the tank vertickly is to be able to drain accumulator and not leave stale water. , the max cylinder pressure is the pressure that manufactures recommend to not over tax the rubber membrane,it is also good practise is to open a tap with pump turned off when you leave the boat this allows the membrane to rest and not get deformed.John



This message was edited by annville on Jun-12-18 @ 5:55 PM

Dilligaf
Jun-12-2018 @ 10:27 PM                           Permalink
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Let the pressure out of the water system before re-pressurising the accumulator or it won't work, I would pump up to pressure the water pump cuts off at.
I run mine at 3 bar as I have a 45psi pump and 4 bar prv.

Dave.
Formerly 'LeoMagill'

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