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Converting force to pressure for hydraulic jack?

Converting force to pressure for hydraulic jack?

Converting force to pressure for hydraulic jack?

Hi there,

I am working on the jacking of a bridge. The contractor needs to know the pressure equivalent of a 130kN force for the specific jack. They will be using a CLP 1502 jack, see below:


I noticed that the manufacturer calculates the pressure based on an effective area of 33.1 square inches. I will use that also but why do they not use the area of the saddle(See the tech sheet linked above)? Which is 27.34 square inches instead? I am completely new to this sort of thing so excuse my ignorance.

RE: Converting force to pressure for hydraulic jack?

Saddle diameter/area is just the area that will be in contact with what you are jacking. This is totally independent of jack capacity

To determine hydraulic jack capacity, you need the area on which the fluid is acting. This is equivalent to the area of the 6.5" hydraulic ram bore. The area is 33.1 in^2 (This is dashed lines in figure you have attached).

Pressure*Area= Force

For your example, you need hydraulic pressure of only 881 psi

Hope this helps

Pipe Stress Analysis Engineer

RE: Converting force to pressure for hydraulic jack?

Thanks Jeff, that helps a lot!

RE: Converting force to pressure for hydraulic jack?

I am amazed that you are not banking on the manufacturer's catalog for that information.

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