The generally accepted economic flow velocity for water supply pipelines is in the range of 1–3,5 m/s. The maximum recommended flow velocity for a GRP pipe is 5-6 m/s.
Of course, depending on the conditions as velocity profiles, misaligned joints, type of vortices at fittings, type joints, special liners, etc.) velocities a little bit higher than 6 m/s can be used, if the water is clean and contains no abrasive material.
Did you check the flow velocity in your project?
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