Heat treated welds

/ Heat treated welds #11  
I stand corrected, I should have done some research first. Now I'll have to do some research to see how the meth heads are using it for crystal meth...

Using anhydrous ammonia safely on the farm : Nitrogen : Nutrient Management : Agriculture : University of Minnesota Extension
"What is anhydrous ammonia, and why is it so risky to handle? It is a chemical made up of one part nitrogen and three parts hydrogen. The properties of this fertilizer make it one of the most potentially dangerous chemicals used in agriculture. Ammonia gas is colorless and has a sharp, penetrating odor. When used as an agricultural fertilizer, it is compressed into a liquid. In the liquid state, it is stored in specially designed tanks strong enough to withstand internal pressures of at least 250 pounds per square inch (psi). As the outside temperature increases, the temperature of the liquid in the tank increases and the liquid expands, causing the vapor pressure in the tank to increase. For example, at 60°F, the pressure is 93 psi and at 100°F, the pressure is nearly 200 psi."
 
/ Heat treated welds #12  
Thanks Gary, I've had enough high school science to understand that. These tanks are 1000 gallons so I am guessing it would be spot treated. Would there be an obvious sign of heat treating or do you think it be simply a certificate of some sort of proof of heat treatment?

There are companies through out the US that specialize in weld stress relieving and come right to the site.
 

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