Abstract: Gas pipeline steady state formula is very useful in pipeline design and management.Currently,the application scope of gas pipeline steady state formula in China is limited because of kinetic energy term being neglected.Based on the mass and momentum balance of gas motion in pipeline,a rigorous analytical equation is derived for gas pipeline between flow rate,inlet pressure and outlet pressure.This equation takes both elevation change and kinetic energy term into account,and hence makes calculating precision higher and application scope wider.Because of steady state formula for elevation change is implicit,computer programs are developed to handle applications.The applications and analysis show that while pressure difference between two ends of pipeline is larger,the kinetic energy term should be considered in the formula;and while inlet pressure increases and outlet pressure decreases,the flow rate may not be increase.

Key words: pipeline, natural gas, steady state, mathematical model, formula