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Discussion Topic: Pressure tank
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Paladine |
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Harnser Trainer
Posts: 7491
Joined: Jul 2008
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BB, have you got the problem sorted yet? If so, how?
"..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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BuffaloBill |
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Mardles sometimes
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Joined: Dec 2008
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Hi Mr P.
Just got back last night so here is what I found....
The tank pressure was 11psi. I took the water pressure
off and then pumped the tank to 20psi. It seemed a bit
better but not what I would expect from a tank that size.
Then I found underneath one of the pipes, what seemed to
be a pressure switch in the pipe from the pump. There
was no indication of settings or even which way to turn
it for more or less pressure. Anyway, I screwed it right
down and it again seemed to improve things but not what
I would expect.
Due to other small jobs needing doing, I left it at that
for now. I would have felt better if I could have seen a
max. pressure rating on the tank but even using a mirror to
get to the underside, nothing.
So, a small improvement but still needs work. (Sounds like
my old school reports...  )
The older I get...
The better I was....!!
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Marshman |
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Mardles sometimes
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Depends who you listen to!!! Mine works very well at about 6-8 PSI - the sort of pressures quoted are for when you have a direct system in your house and use them in that situation!
Not sure what would happen if I put that pressure into my boat....!!!
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Dilligaf |
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Forum Regular
Posts: 478
Joined: Jun 2010
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If the accumulator pressure is higher than the pump output pressure it may as well not be there as the pump will never fill the accumulator to give any advantage, it's the pump pressure that determines the rest.
I work on accumulator slightly lower than pump pressure and expansion tank slightly higher than pump pressure so it stays empty when cold and only fills when hot.
Dave.
Formerly 'LeoMagill'
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Paladine |
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Harnser Trainer
Posts: 7491
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BB, the following comments are based on my assumption that your accumulator tank is identical to the Jabsco/Cleghorn Waring CW288 tank I provided a link to earlier, and that your pump is a Par Max 3.5 (your photo was a bit fuzzy). I suggest the pressure switch you’ve found is from an earlier installation and is no longer required with the Par Max, which has its own internal pressure switch.
The maximum permitted internal pressure of the tank is 6 bar (90 psi). The cut-in pressure of the pump is 0.7 bar (10 psi) and the cut-out pressure is 1.8 bar (25 psi). The air pressure in the tank needs to be 2-3 psi below the cut-in pressure of the pump, so 7 or 8 psi. If you’ve pressurised the tank to 20 psi, you’ve stopped it from working.
This information is from the official Jabsco data sheets. May I suggest you set the system up as above and bypass the external pressure switch, which might well be working against the system, and be the cause of the problem.
"..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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Jun-18-2018 @ 5:41 PM
