On Sat, 24 Apr 2021 15:48:41 -0400, Ralph Mowery
wrote:

In article ,
says...

Makes no sense to me that these tanks fails so quickly. It's just a plastic
bag, inside a tank, not exposed to weather, UV, etc. I recall seeing ones, maybe
they all have it, with a good size plug on top that the air fitting comes out of.
I assumed you can get a new bladder and replace just that. Which would be
a lot easier and cheaper, assuming the plug will come out and that's what
it's there for. Also I still can't fathom how a broken bladder results in the tank
gaining air. I would expect it to lose air, as the air is slowly absorbed into
the water.




I guess they fail because of all the flexing. One side is next to the
water so if the water has something in it that could also make them fail
sooner.

I can not think of how it makes and ar pressure. That is what had me
puzzled before I found the video and another showed his gaining air. I
know on the older tanks with out a bladder people often had to add air.
Maybe the air pressure builds up from a small hole and I did not leave
the water line open long enough for the air to bleed out of the bladder.

I will guess your bladder has a pinhole leak in it. When the water
pressure is at its max, a small amount of water leaks into the air
chamber. It stops leaking when the air chamber gets up to the 60 psi
you have observed. When the water side pressure it lowered, the leak
seals itself. The air side is left at the system max pressure but is
still mostly air. I believe your problem will be solved when your
tank is replaced.