I have a John Woods pressure tank that needs to be replaced. I looked all over the tank for a size but I couldn't find anything. It is a stand up tank and is 27" tall by 53" around. Does anyone have an idea of how many gallons of water it will hold? My pump is 1/2 hp and flows 5.3 gallons. Thanks.

I have a John Woods pressure tank that needs to be replaced. I looked all over the tank for a size but I couldn't find anything. It is a stand up tank and is 27" tall by 53" around. Does anyone have an idea of how many gallons of water it will hold? My pump is 1/2 hp and flows 5.3 gallons. Thanks.
From your description you have a 15 gallon JAPR Series / Type 1 Bladder tank. A Well-X-Trol WX-20 stand up bladder tank,(see image) will be just about a exact replacement. Good luck, Tom

SB in entirely correct. Your tank would have a diameter of about 17 inches. You can spec it yourself at this site:

http://www.pumpsandtanks.com/Tanks/Images/a_bladdertankspecs.jpg

I would suggest you consider going to a larger tank. This would lengthen your pump cycles which is generally considered to be a good thing. The most work a pump does is when it initially cuts on. The larger the pressure tank, the fewer times the pump will be asked to cut on. My pump is similar to yours and I have a 36 gallon tank. I only wish now I had gone to a larger tank, though the 36 is doing great.

Thanks for the input. I was thinking of going to a larger tank... so I guess I will. Before the old one blows up... :)

You should go to a 30-gallon or so tank. Then, in a medium pressure operating range, your pump would pump it up in about 2 minutes. That assumes that nobody is using water elsewhere at the time. The absolute minimum the pump should run is 1 minute. Your current 15-gallon tank may have met the 1 minute run time. But, just barely. You can't go to big. But, too small will wear out your pump prematurely. Start up is what kills your pump.
Good Luck,
Al