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quite like a "water hammer"
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Yes. It is a big and noisy bomb. 2.7mH2O and 2000l/h. The impeller is not firmly fixed the rotor, has a light roominess in the draft, it might influence something also helping the rotor to acquire more initial acceleration
Given the incomprehensibility of the water expects for me a minor time or even nothing from delay, but the measurements say the opposite thing to me. Also think that is possible that the pipe of silicon was expanded the sufficient thing to create this delay.
I will try to test today with the piezométrics pipes as unitedly as possible and also I will use a pipe of copper that I have hereabouts.