local shell stresses from pad/lug/leg welded to shell?
local shell stresses from pad/lug/leg welded to shell?
(OP)
Hi,
I am looking into putting legs onto the cylindrical shell of a vertical vessel. My understanding is that the vessel will not fall under ASME codes, because it will be pressurized to a maximum of 1.3 bar (absolute) during operation.
There will be reinforcing pads attached to the cylindrical shell by welding the reinforcing pads around their perimeters onto the shell; then, lugs will be welded to the reinforcing pads; finally, legs will be welded to the lugs.
My question is, how should I approach the analysis of local stresses within the cylindrical shell due to horizontal loading on the shell/pad/lug/legs?
The horizontal loading is from ASCE-7 seismic loads.
In the handbook by Megyesy, there is a section regarding analysis of shell stresses due to vertical loads acting on pads/lugs; can that be adapted to horizontal loads?
I have heard of a WRC 107 bulletin, but I am looking for an alternative resource, before shelling out ~300$ to access WRC 107.
Any help/advice appreciated
I am looking into putting legs onto the cylindrical shell of a vertical vessel. My understanding is that the vessel will not fall under ASME codes, because it will be pressurized to a maximum of 1.3 bar (absolute) during operation.
There will be reinforcing pads attached to the cylindrical shell by welding the reinforcing pads around their perimeters onto the shell; then, lugs will be welded to the reinforcing pads; finally, legs will be welded to the lugs.
My question is, how should I approach the analysis of local stresses within the cylindrical shell due to horizontal loading on the shell/pad/lug/legs?
The horizontal loading is from ASCE-7 seismic loads.
In the handbook by Megyesy, there is a section regarding analysis of shell stresses due to vertical loads acting on pads/lugs; can that be adapted to horizontal loads?
I have heard of a WRC 107 bulletin, but I am looking for an alternative resource, before shelling out ~300$ to access WRC 107.
Any help/advice appreciated





RE: local shell stresses from pad/lug/leg welded to shell?
It appears to me that you got a vertical load (the vertical PV) being supported from below by a small cantilever of the vertical legs-lugs-pads offset, but that's all. Are you thinking of his (Megyese's) horizontal loads from wind/seismic conditions?
RE: local shell stresses from pad/lug/leg welded to shell?
The horizontal loadings are seismic design forces from section 13.3.1 of ASCE 7-10
(see: http://boo
Although Megyesy, and Moss's books have methods for analyzing horizontal loads on lugs and legs, I am looking for methods to analyze horizontal local loads applied to the shell itself, in addition to the pressure and vertical loads (weight) already acting on the shell.
RE: local shell stresses from pad/lug/leg welded to shell?
Welded Steel Tanks for Oil Storage - APPENDIX P—ALLOWABLE EXTERNAL LOADS ON TANK SHELL OPENINGS