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Good eve. I am finally starting meaningful gas training(i.e. Timmie's training manuals). I have a few basic questions. Number one is what is the reason behind gas pipe sizing? In water supply the main concern is volume of water. If the pipe size is to small then the volume of water that can pass through that pipe will be limited. Water is not compressible and therefore only a limited amount can pass through any given pipe.Is the same concept true with gas? Are the limits on how much gas is allowed for a given pipe based on the volume of gas that can pass through that pipe? Or maybe gas works differently. Gas is compressible(I think). Are the sizing charts designed to eliminate friction caused by undersized pipes with will result in an unexceptable pressure drop?Meaning that if a given gas pipe is too small the needed volume of gas will be able to pass through but the friction will create an unacceptably low gas pressure. Please help set me strait. Thanks in advance for sharing your wisdom!