I'm getting the well system in my home back in working order and
breaking it off the household feed for use as outside water sources and
irrigation.

I have an existing pressure tank that I can use, 36 gallon Sears
390.29161 - I need to test the air bladder which I'm in the process of
tonight.

In the event that I've got the same air pressure in the morning that I
had when I refilled the air I'll need to know the PSI that the bladder
should be filled to while OFF SYSTEM and no water in the tank.

Anyone have any ideas how much pressure should be in them?

I'm hoping to not have to replace the tank and to avoid that expense and
to only have to work on a new jet pump. Replacing both would double the
costs.

As for the pump, I'll be using a 1/2HP convertible jet pump. Pretty
standard stuff and the lowest HP I seem to be able to get. I really
shouldn't need more than 10GPM at any given time.

BTW, irrigation would be a drip system covering the flower beds and
possibly a small veg garden, just in case you're wondering.

Alot of rambling for a little question (how much pressure in the air
bladder, that is) but I figured I'd explain what my needs are and what
I'm doing just in case anyone wanted to kick further input.