Testing Pad eyes 5

[IrishBoots]

Good afternoon all.
At this very moment i have a mountain of paper work in front of me regarding Padeyes. But no answers to my questions.
I need a chart/ standard to calculate the size of a pad eye. Think of eye in relation to plaat thickness and WLL. FOS can be calculated at a later date ( depending on use of said Padeye)
Any and all info is welcome.

Irishboots.

 

[Ron]

OK...first of all, explain your issue without using acronyms that might be unfamiliar to others....this is an international forum and you need to remember that others might not know what you're talking about if you use local vernacular. You will probably get a good range of answers that might be relevant to your issue, but they might come from a more diverse perspective than you expect.

 

[IrishBoots]

Thanks Ron for the tip.

What I need to be able to do is check the pad eye/ lifting eye.
I have to know if the size of the hole is correct, the amount of metal between the hole and the top of the pad eye is sufficent to hold the WLL/ working load limit
The FOS/ factor of safety ;I can calculate at a later date.
All these tests will be done for an Offshore company and the standards must be heigh.
As for the welds.......I will leave that to the MPI boys and girls.

Kind regards

Paul

 

[desertfox]

Hi IrishBoots

Have a look at this link its shows how to size and check lifting lugs:-

http://www.scribd.com/doc/19258533/Design-of-lifting-lug

desertfox

 

[Canadieng]

ASME BTH-1 (Below The Hook):

http://www.techstreet.com/standards/ASME/BTH_1_2008?product_id=1608005

Covers the design of Lifting Lugs/Pad-eyes/Pin-connected Plates

 

[jbeckhou]

See DNV 2.7-1.

Petrotrim Services

 

[Ussuri]

The size of the hole you need is determined by the shackle pin size.

You need to check you design at hole level and base level.

At hole level you need to check the bearing capacity due to the pin and also check shear pull out. Consider if you have an offlead on the shackle which will locally increase the applied stress. You may need cheek plates.

At hole level you need to check the plate for biaxial bending, shear and tension. These are generally a function of the angle at which the load is applied to the padeye.

Next is capacity of the weld at the bottom, followed by a check on the structure you are welding too. No point designing a padeye to suit a 35 tonne shackle if you intend to weld it to 4mm plate.

 

[IrishBoots]

Thanks all.

Great tips. Will add and steal from each one to built a testing program.
Paul

 

[unclesyd]

A little more information.

http://www.nsrp.org/Ship_Production...g_Analysis_Integrated_Lifting_Lug_Testing.pdf