# Thread: Simple Cantilever Lifting Beam Design

1. ## Simple Cantilever Lifting Beam Design

Hi all,

I am struggling with designing a lifting beam for an offshore platform.

It will be a cantilevered I beam, capable of lifting 4T weight using a pulley on the end, (1500mm from the support). The material will be S355.

Can any one bring me through the calculation/method in order to select the correct I beam please?

Cheers,

Darren

2. How long is the "tail" of the lifting beam or is it a true cantilever? You'll also need to account for the weight of the lifting gear, stall load and factors of safety.

3. Originally Posted by Cake of Doom
How long is the "tail" of the lifting beam or is it a true cantilever?
To find the loading scenario and a calculator to determine deflection and maximum stress, look here:

Beam Deflection and Stress Calculators

correct I beam

Ixx and Iyy are the numbers you need to use in the deflection calculators above.

W-Flange I Beam
STEEL BEAM AND COLUMN ANALYSIS / CODE CHECK

or

Wide Flange I Beam Section Properties #1

Wide Flange I Beam Section Properties #2

Narrow S Flange I beam Section Properties

4. Did you quote the right post for the first quote, Kelly?

5. Originally Posted by Cake of Doom
Did you quote the right post for the first quote, Kelly?
I thought your question was better than the op's. The op will need to be more specific if they are to get help or find the solution.

6. Oh, I get you now. Last thing on a Friday so I'm allowed to have a "moment".

To the OP: With this being off shore, you'll need to check the specific codes of marine work. It won't be as simple as just sizing a beam to carry 40 kN; they'll be (possibly quite heavy) environmental loads too. There are also different standards for permanent and temporary installations.

As Kelly pointed out above: the more information you can supply, the better the answer will be.

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