一般干线输气管都在阻力平方区The main pipelines are generally in the resistance square area, 不满负荷时在混合摩擦区Under load in the mixed friction zone, 城市及居民区的配气管在水力光滑区。The air pipes of urban and residential areas are in the hydraulic smooth area.
当输气管的Re>Re2时,为阻力平方区When Re>Re2 of the gas pipe, is the resistance square area; 当输气管的Re1<re<re2时,为混合摩擦区when of the gas pipe, it is mixed friction zone; hydraulic smooth>