×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Converting force to pressure for hydraulic jack?

## Converting force to pressure for hydraulic jack?

(OP)
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%20series....

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
Jeff

### RE: Converting force to pressure for hydraulic jack?

(OP)
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.

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!