High pressure

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jcambrose

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I had a blown bladder tank yesterday. Noticed short cycling of pump and tank was full of water. I replaced the tank today which went well all things considered (old house projects never go well!).

When I recharged the system, the pressure switch let the pressure build to over 80 before I cut it off at the breaker (it was previously set at 40/60 which would be fine for new tank precharged to 38). I have loosened the #1 screw about as far as it will go and the contacts still stay closed until 70/75. Measuring the pressure at the top valve of the tank confirms gauge is accurate (+/- 5 psi).

Where do I look now? Dismantle and clean everything? New pressure switch even though it was good when the project started? As I write this I am considering that maybe the switch went bad without me noticing which caused the high pressures I am currently seeing and caused the tank to fail....plausible? It's quite the journey to a hardware store so trying to solve this with 1 (or none?) additional trips.

Thanks!
 

Sarg

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I would also suspect the contacts on your switch ....... and if you do change the switch be sure to inspect the 1/4 nipple connection pipe ..... I would buy another nipple while at the store ...... they do become clogged.
 

Valveman

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When using a 40/60 switch and the pump does not shut off at 60 as it should, either the switch is bad or the nipple to the switch is clogged. But the bladder in the tank was most likely caused by the pump cycling on and off, not high pressure. It takes a lot of pressure to pop a bladder as the pressure is still equal on both sides.
 
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