Cylinder Filling Guidelines
We get this question all the time. "I was told I can only put 800 lb. in 1000 lb. Cylinder". 20 years ago this was the guidance. There are two authorities when it comes to filling cylinders. AHRI gives guidance in Guideline K. The Department of Transportation has regulations. The DOT allows higher amounts and they are the legal authority on the subject.
The good news is you can put more R22 in 1000 lb. cylinder. AHRI recommends 957.60 lb. The DOT limit is 1050lb. Follow the link to an article in The NEWS.