Converting force to pressure for hydraulic jack? 1

[Redacted]

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:

http://www.tksimplex.com/customfiles/clp series.pdf

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.

 

[JGard1985]

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
Jeff



Jeff
Pipe Stress Analysis Engineer

http://www.xceed-eng.com

 

[Redacted]

Thanks Jeff, that helps a lot!

 

[chicopee]

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