1 pump to two hydraulic jacks?

Question

1 pump to two hydraulic jacks?

RStars (Structural)

(OP)

31 Mar 17 01:12

Hi there,

I am working on a bridge reparation project and the contractor will need to use 2 jacks on the underside of a bridge at the same time with a pressure of 881 psi in each. They will be using the following power pump :

http://www.tksimplex.com/html/product_detail.php?p...

The pump has one internal pressure gauge already attached to it. The pump will be attached to the two cylinder jacks. Will the pressure that is shown on the gauge show the pressure in each individual hydraulic jack cylinder or is the pressure halved between the two cylinders?

hydtools (Mechanical) · Answer 1 · 2017-03-31 01:30:45

The pressure shown on the gauge is the pressure in each jack.

Ted

RStars (Structural) · Answer 2 · 2017-03-31 01:46:26

RE: 1 pump to two hydraulic jacks?

RStars (Structural)

(OP)

31 Mar 17 01:46

Thanks for the fast response.

JGard1985 (Structural) · Answer 3 · 2017-03-31 14:18:42

Like mentioned above, hydraulic pressure is constant in the system.

Your jacking force is dependent upon cylinder bore. When using two jacks you should really consider how you will be lifting. The hydraulic system by its nature will attempt to equalize pressure. If the loads are uneven the system by its nature will attempt to equalize the load. The end result is a lightly loaded cylinder will move faster than a heavier loaded cylinder. You could get an unbalenced load with no ability to control each jack.

You need to see if the jacks are required to lift together (Same displacement). If so you should have a unified jacking system that ensures that all jacks raise at the same rate. Only you know your project specifics.

If I were you for more control, I would use a unified jacking system or control each jack from its own pump.

Jeff
Pipe Stress Analysis Engineer
www.xceed-eng.com

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1 pump to two hydraulic jacks?