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First you state:

Then:

:confused: (to say the least)!

The construction of the Amtrol Well-X-Trol bladder water tank, model WX-250 that I have looks like this:

http://garylee.home.att.net/wellx.jpg

In addition, when the tank precharge was set at 38...

You may have something there. I conducted a few experiments this morning and ended up reducing the tank precharge from 38 to 34 PSI. The bang (water hammer) was significantly reduced both in volume...

I did; I received the following answer:

"1- Pressure switch setting is not the problem. The preset cut on from the factory is
either 30 or 40 which can not be too low for ANY pump. What that...

The following instructions for adjusting a pressure switch comes from the Signature 2000 owner’s manual available here: http://www.onga.com.au/secure/downlo...fileid=1001397

TO CHECK PUMP PRESSURE...

Our residential water system has performed reliably and well since its installation 14 years ago. Recently however, when any upstairs faucet is drawing water and the pump starts, it starts with a...