In this paper we propose and demonstrate a non-intrusive measurement method for internal pressure and water flow in
hydraulic pipeline systems. Fiber Bragg Gratings are used to measure deformations in the external side of pipes under
different working conditions for two different experiments. In the first experiment a PVC sewerage pipeline with a
diameter of 90 mm was subjected to a variable air pressures up to 4 bars; in the second a PVC sewerage pipeline with a
diameter of 32 mm was subjected to a water flow between 10 and 35 liters per minute.