An understanding is given of how gas pipelines decompress when they burst and fail longitudinally in a ductile mode. Transient gas flow equations expressing conservation of mass, momentum and energy are used to develop simple and realistic equations for gas pressure decay with time at a moving longitudinal ductile fracture. Gas thermo-dynamic properties and two-phase behavior are discussed. Friction and heat flux affect gas decompression and influence design to control longitudinal ductile fractures in gas pipelines.

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