thermal expansion


I'm seeking advice on the proper sized expansion tank for my existing hot water tank. I have a 50 gal gas water heater. My pressure ranges from 40 psi to 100+ increasing after showers, dishwasher use, etc.
Can anyone help?
Also, how is the proper charge determined?
Thanks
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Here's all you want and need to know about thermal expansion and expansion tanks...
http://wattsreg.com/pro/divisions/watersafety_flowcontrol/learnabout/learnabout_thermexpansion.asp?catIdd
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