Help sizing natgas line

[layingpipe]

Im putting heat in my pole barn but having trouble sizing the lines. I don't know what table to use for pipe sizing. Not sure what pressure i have, what the pressure drop is

 

[Terry]

Natural gas? Or do you have a propane tank feeding this?

 

[Sponsor]

 

[Fitter30]

Decide what piping material your using, how many 90s ( elbows) tees ,btu's and total lenght of pipe.