The water hammer coupled model called « FSI four-equation model » describes the axial dynamic behavior of liquid-filled pipes against a water hammer. Dynamic coupling type, boundary conditions and initial conditions define the model. The MOC, frequently used for numerical computation is often based on linear interpolation. However, this method remains inadequate in some practical cases. For more precision, one uses the wave speeds correction method. This paper gives comparison between different methods used for the water hammer coupled model calculation in quasi-rigid pipes using the MOC. Calculation codes implemented on
are applied to Hadj Taïeb experiment. They show that the wave speeds correction method and the linear time interpolation method converge to the same solution.