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This work presents a 3D coupled solid-fluid model for predicting fast failuresin pressurised plastic pipes. It is developed within a unified computational procedurewhere both solid pipe and pressurising media are discretised using the Finite Volumemethod. The coupling is achieved across the pipe-fluid interface (pipe bore) via specialinterpolation procedure. Cohesive zone model, which describes the local separation(fracture) process, is incorporated into the model allowing the prediction of the crackgrowth along the pipe. The model is qualitatively validated against the Full Scale (FS)experimental observations on gas pressurised MDPE (PE80) 250SDR11 pipe. Predictedpressure and crack histories, crack front shape and behaviour of the pipe during rapidcrack propagation (RCP) in general, agree with experimental observations.