Abstract
The force causing the ductile fracture propagation in pipelines containing pressurized compressible fluids is given by the residual pressure of the discharging fluid, acting on the internal wall downstream of the crack tip, in the opening flap area. The value of this force is determined by the pressure profile of the rarefaction wave propagating in the pipeline. The classical treatment of this phenomenon is based on the assumption of perfect gas behaviour and similarity flow, in which conservation of entropy holds. In this context real hydrocarbon fluids are considered, and simulated by using real EOS with special focusing on two-phase flow conditions in the gas-condensate regime, assuming a homogeneous thermodynamic equilibrium model. Real-fluid properties influence the decompression wave propagation, through condensation/vaporization phenomena, sound velocity trend and frictional effects. A treatment of the thermodynamics and fluid mechanics of this problem is presented, as well as simulation results relevant to industrial applications.
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