Recently I got asked to size a high pressure natural gas line, which I’m not an expert at, but I wanted to help these guys out. A gas line is sized based on the type of gas used, so that is the first ...

Maximum capacity shown in the drawing is for black iron piping for gas pressures of 0.5 psig or less and a pressure drop of 0.3-in. water column. This chart is based upon a specific gravity of 0.60 ...