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Surge tank and air chamber are the most used devices to protect a pumping installation from either cavitation or excessive pressure during water hammer. These devices transform the water rapid variable movement into a slow oscillatory one. The choice of the optimal protection solution should rely not only on hydraulic, but also on technical and economic calculation. Numerical simulation of the water transient movement reveals the most effective protection method for the water pumping station SRP 4 Seimeni, Constanta county.