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For questions about the design, classification and working principle of pumps. A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action.

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a submersible pump in a sump pit is subject to being fouled by sedimentation i.e., the slow accumulation of sand and silt in the pit during extended periods of inactivity. If that silt gets into the i …
answered Sep 12 '18 by niels nielsen
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Here is a simple check. power is always the product of a flow variable (current, flow rate, RPM) and an effort variable (voltage, pressure, torque). You can measure the voltage and current going i …
answered Dec 6 '18 by niels nielsen
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If one wishes for the flow rate of blood through the pump to increase, the power output of the pump must increase and the consequence of this is that the output pressure of the pump increases. the pr …
answered Jan 3 '18 by niels nielsen
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A stalled hydraulic pump is one the following: its outlet is blocked, to allow measurement of it maximum outlet pressure under stalled conditions a pump which has stopped delivering flow because o …
answered Dec 6 '18 by niels nielsen
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pumps called mechanical lift pumps existed before then. these had the piston/cylinder and check valve assembly deep in the hole. actuating the piston with a long rod lifted one cylinder's worth of …
answered Apr 29 '18 by niels nielsen
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high pulse rate + low pressure means low pumping efficiency of the heart. this can be caused by: leaking valves, especially the main aortic valve, due to disease or calcification; low blood volume, …
answered Sep 10 '18 by niels nielsen
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aluminum foil will not stop the seepage of air through its folds. Here is how your pump works: Most vibratory aquarium pumps have air inlets of four types: 1) underneath the bottom you may find a … small tightly-squeezed-in plug of porous cloth (felt) which hides the air inlet and acts like a dust filter to keep dirt out of the air hoses. 2) cheaper air pumps use the small gap between the top …
answered Jun 9 '18 by niels nielsen
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yes. knowing the surface tension of the fluid and its contact angle with the channel walls, you can select a channel width that does not support two-phase flow, where bubbles and fluid can pass by one …
answered Jun 16 by niels nielsen