Suction, impeller, valve ordelivery pipeline clogged. Clean carefully. Weared pump or impeller. Replace or repair. Errato senso di rotazione. Invert two of the three phases (see par. 7.2: “Direction of rotation”). Air or gas in the pumped liquid. Increase dimensions of pit or collecting tank and foresee degasing devices. Presence of air in
Для этих трех жидкостей зависимость напряжения сдвига от давления сильно отличается. 3. A single impeller only may be required up to a working pressure of 180 psi. Although work has been done in measuring the frequency of shedding of vortex rings from a sphere, no