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Pipe size and diameter connecting hydraulic pistons

  1. Oct 21, 2013 #1
    Hi everyone,

    In the attached diagram there are two hydraulic systems. The cylinder areas for each system are the same. The only thing that is different between the two systems is the pipe joining them, system B having a much smaller ID.

    Pascals law states that these two systems would act the same and that the force would be transmitted in the same way. I agree with this.

    My question is, would the downward moving piston in system A move faster than the downward moving piston in system B, because system A has a much wider ID pipe joining the two cylinders? In other words both systems would transmit the same force but would system A transmit it faster?

    Thank you.

    Attached Files:

  2. jcsd
  3. Oct 21, 2013 #2


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    Science Advisor

    In practice, a narrower pipe will offer more resistance to flow, will waste energy and will slow down the movement. In theory, and the absence of viscosity, there would be no difference.

    A narrow pipe will choke the flow because the flow becomes turbulent.
    Hydraulics is used for power, pneumatics is used for speed.
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