reference to design plate with stiffeners 1

[delagina]

I have a tank that will be pulled off horizontally.
Contractor will put pipes at the bottom so it's easier to pull it.
The tank will come with shipping brackets by manufacturer so lifting up is not my scope.
But once inside the plant, they will need to pull this to its exact location because of interference issues.

I will weld the pulling lug at the stiffener.
I'm not sure if I need to weld the stiffener angle all around the tank or just at certain length along the circumference?
Hence, I'm looking for a reference for plate design with welded stiffeners.
Also what coefficient of friction I should assume in this case if there are pipe rollers below.

 

[delagina]

I was thinking of also adding vertical stiffener at pulling lug location.

 

[dik]

How big, and, how heavy? Can the existing structure take the loads? What is the existing structure? Hopefully not deck and concrete topping...

Dik

 

[robyengIT]

why in the middle of the wall and not closed to the rollers ? the horizontal wall will act as a stiffener for pulling. And you can use for tilting too

 

[delagina]

Rob, the atiffener location is not final. I plan on putting it as low as possible. There are openings at the bottom so I can't put it at the very bottom. I could if I dont need the horizontal stiffener to be all around the tank. I don't think I need the horizontal stiffener to be all around but I'm not sure how to calculate how long it needs to be. Hence, Im looking for a reference.

Dik, this wont be supported by existing. It will just sit on foundation.

 

[delagina]

I'm looking at roarks plate design but not sure whst length and width to use and how the stiffener helps the plate the design.

 

[WARose]

Not sure what the diameter of the tank is but any good pressure vessel handbook will let you figure the loads for a localized load like that. A good one is 'Pressure Vessel Design Handbook', by: Henry Bednar (2nd Edition). Where the point loads can't make it, they have design steps for pads.

Also what coefficient of friction I should assume in this case if there are pipe rollers below.

That whole set up makes me nervous. I don't know how much this thing weighs....but they can't put it on a set of dollies instead? They make some really good ones these days:

http://moveheavystuff.com/heavy-duty-dollies-machinery-skates-rt/

 

[delagina]

It's only 4ft high, diameter is 12'. I'll try to check some other references about ducting plates design with angle stiffeners. Furnaces are made of plates with stiffeners, maybe I can use thst.

I think a few feet of angle stiffeners welded to the plate, the lug will be welded to the stiffener should work. Just so far not sure how to calculate it.

 

[ukbridge]

EN 1993-1-5 probably has the equations you need to design the stiffened plate.

 

[delagina]

I think I found what I'm looking for...

ASCE: Structural Design of Air and Gas Ducts for Power Stations and Industrial Boiler Applications