Wind Girders for API 650 floating roof tanks
Wind Girders for API 650 floating roof tanks
(OP)
What is the theory behind finding the Z (= modulus od resistance of the ring including tank shell contribution ...in in3 or cm3!!).
I mean if there is a (Z) then there is a bending moment.
How to find this Moment and the corresponding Shear Force ??
The reason I am asking this is: we want to use a wind girder with no web , instead we will use a sort of bracing or lattice to link one side of the Ring girder to to the tank wall...
And the question is how to size and check the lattice ?
I mean one has to reckon also with shear load and lnk structurally the two ring flanges !!
Thanks for your answer
I mean if there is a (Z) then there is a bending moment.
How to find this Moment and the corresponding Shear Force ??
The reason I am asking this is: we want to use a wind girder with no web , instead we will use a sort of bracing or lattice to link one side of the Ring girder to to the tank wall...
And the question is how to size and check the lattice ?
I mean one has to reckon also with shear load and lnk structurally the two ring flanges !!
Thanks for your answer





RE: Wind Girders for API 650 floating roof tanks
Joe Tank
RE: Wind Girders for API 650 floating roof tanks
Just my opinion. I'm curious what others have to say about it.
RE: Wind Girders for API 650 floating roof tanks
A similar question comes up when superimposing dome roof loads onto the wind girder.
I would suggest to take the required section modulus, multiply by your estimation of an allowable stress, and take that as the designated API wind moment.
RE: Wind Girders for API 650 floating roof tanks
Lattice type windgirders were used (though not extensively) on open top tanks many years ago. The few that I have seen were on riveted tanks. Cost-wise, I have to believe that they are far more expensive thanplate type windgirders, primarlity due to the labor content.
Joe Tank