Subject: How can I calculate the stress force applied to a T joint?

If a thermal expansion tank weighing 16 lbs is installed on a horizontal 
plane and will slowly receive upwards of 1 gallon of thermal expansion 
during a given cycle, how can I calculate the stresses applied to the T 
joint where the pipe joins? How can I calculate the changes caused by a 
longer or shorter horizontal branch line to the tank? 

Imagine a T laid on its side with the base running horizontally to the tank 
inlet via a 6" long stub of 1/2" copper tubing. Water at 8.33 lbs per 
gallon is introduced into the front portion of the tank - a pre pressurized 
air bladder holds against the inflow and causes the water to build up in 
the inlet side of the tank.
I write a plumbing column for Contractor Magazine (contractormag.com)& 
would like to use this information in an argument for adequate support of 
these types of tanks.

Re: How can I calculate the stress force applied to a T joint?