Skirt Opening/Access Reinforcement

[PVdesigner]

Hi all

Would anybody please give me the design basis on the skirt access/opening reinforcement on vertical vessel ? How the reinforcement is calculated ? Any good reference material or book related to this topic ???? Thanks in advance.

 

[dig1]

Look at EN 13445, Part 3, 16.12. This has a section on skirt openings.

 

[JoeTank]

The area removed is the hole diameter times the skirt thickness. the area required to be replaced is the same. The replaced are is in the form of repad and the nozzle neck. This is a conservative way to reinforce the opening. the welding must be sized to resist the design forces. Vertical compression is the controlling factor in this case.

Joe Tank

 

[Mandeep1]

If the vessel is subjected to decent wind or seismic load or if it is tall tower, then you have to check the stress in the skirt opening.

Compute the cross-sectional area and sectional modulus of the remaining metal. You have to find the weakest cross-section and then apply the

force/area + moment / section modulus to get the stress in the section.

Btw, if you have PV Elite software you can analyze stress in vessel skirt due to multiple openings. But, if you follow basic engineering principles you should be able to do by hand as well.

best regards,
Mandeep Singh