Accumulator tank loosing pressure

[LadyInBed]

Having had the symptoms of pump starting as soon as I run the taps, on advice from the panel, I repressured the Acc tank to 2 Bars. This has done the trick for a time, but now the symptoms have returned.
Should the Acc tank hold its pressure (in theory) ad infinitum?
Is 2 Bars sufficient?
Where are the points that it can loose pressure?
The obvious one that comes to mind is the pump 'filler' valve, are there others?

 

[NormanS]

It's always a possibility that specks of dirt are holding the valves in the pump slightly open. This a sneaky leak, because it's invisible, but the water, and therefore the pressure, leaks back through the pump.

 

[seumask]

Not the same but related and hopefully simple to solve. ON my pumped water systems the pump kicks in when the tap is down to a dribble and has got to this state over several years. Do I need to adjust the pressure in the accumulator tank or the sensitivity on the pump?

 

[DownWest]

If you have to repressure the tank, there is probably a hole in the diaphram and the air is gradually being absorbed into the water, until there is non left in the tank. Usually the give away is that the tank is heavy when the pressure is off, as it is full of water.


SM, the pressure switch.

 

[VicS]

Having had the symptoms of pump starting as soon as I run the taps, on advice from the panel, I repressured the Acc tank to 2 Bars. This has done the trick for a time, but now the symptoms have returned.
Should the Acc tank hold its pressure (in theory) ad infinitum?
Is 2 Bars sufficient?
Where are the points that it can loose pressure?
The obvious one that comes to mind is the pump 'filler' valve, are there others?

The accumulator should be pressurised to 2 to 3 psi below the pump cut in pressure. See: https://www.jabscoshop.com/files/Accumulator and Expansion Tank Instructions ZPWL4 doc595.pdf

If it loses pressure at a significant rate the air pressure filling valve is the first thing I would check/ replace.

Not the same but related and hopefully simple to solve. ON my pumped water systems the pump kicks in when the tap is down to a dribble and has got to this state over several years. Do I need to adjust the pressure in the accumulator tank or the sensitivity on the pump?

Your pump needs the cut in pressure adjusting ........ It maybe adjustable but you may need a new pressure sensitive switch,

 

[seumask]

Thank you VicS helpful advice as always.

 

[LadyInBed]

Thanks, so the two possibilities are valve and hole in diaphram.
To check the diaphram, not being easy to lift and weigh it, do you think it would be possible to remove the valve center part and feed some string in to check for moisture?

 

[DownWest]

Thanks, so the two possibilities are valve and hole in diaphram.
To check the diaphram, not being easy to lift and weigh it, do you think it would be possible to remove the valve center part and feed some string in to check for moisture?

Since it is a car wheel type valve, just pushing the inner bit with a match stick will allow water out if the diaphram is indeed damaged.

The other indication of failure is the pump cycles very quickly, as there is no room to store water under pressure .

 

[LadyInBed]

Since it is a car wheel type valve, just pushing the inner bit with a match stick will allow water out if the diaphram is indeed damaged.

The other indication of failure is the pump cycles very quickly, as there is no room to store water under pressure .

That should make life easier.