? for Tim

Paul48

On another forum, someone was discussing his 20kw generator install. He said it was 220000 btus, on a 100' dedicated line,half pound gas. The first 70 ft was run 1.25" and the last 30 ft was 1 inch. I said it was not proper. Am I correct, and if I am, what are the possible problems? Thanks in advance for any help you can give.  

Tim McElwain

Paul, I will

get back to you on this.

Tim McElwain

Assuming

it is natural gas with inlet pressure less than 2 PSI with an allowable pressure drop of .3" W.C. with a specific gravity of 0.60, then 70 feet of pipe at 1 1/4" will handle up to 384,000 BTU's and 30 feet at 1"  will handle 284,000 BTU's so it should be okay. If the 100 feet was all 1 1/4" it would handle 304,000 BTU's. It is always a good idea to have a fairly large manifold for the last six to ten feet to handle the surge in demand when the generator first fires but the figures given should work okay as long as manufacturers specs do not call for something else.

Paul48

Thanks Tim

You are a gentleman and a scholar.