In the figure above, assume a gauge pressure of 4 oz, a pressure drop of 1/2″, water column @ .6 specific gravity of the gas. What is the minimum allowable size for the 12′ section of pipe before the branch to the furnace. (1000 Btu/cubic foot)

In the figure above, assume a gauge pressure of 4 oz, a pressure drop of 1/2″, water column @ .6 specific gravity of the gas. What is the minimum allowable size for the 12′ section of pipe before the branch to the furnace. (1000 Btu/cubic foot)