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Abstract: Through the analysis on the progress of the leakage of gas pipeline，the calculating#br# models of big-hole leakage are established. Based on the leakage process of big-hole，the three#br# kinds of state are discussed and analyzed. It is testified that, under the situations of high-pressure,#br# there only exist two possible states, which are sub-critical flow in pipe and critical flow in orifice,#br# or critical flow in pipe and orifice. While in the case of low and medium pressure, there only#br# exists sub-critical flow in pipe, critical flow in orifice and sub-critical flow in pipe and orifice. The#br# rate of leakage at different points is also analyzed. The leaky rate of different hole diameters can#br# be well calculated by the models in the paper, and it provides basis for quantitative risk#br# assessment of long gas pipeline.#br# Key words: pipeline; leaky rate; big-hole leakage; modeling; analysis
