Stiffening Ring on Vessel for Wind Loading Bending Moment Design?
Stiffening Ring on Vessel for Wind Loading Bending Moment Design?
(OP)
Hi all,
I have some experience on general plant maintenance but I'm not a designer, so please forgive me if this is a really silly question. For tall vessels where the ruling design case is wind load bending moments, is it acceptable to weld on stiffening rings or lugs external to the vessel to reduce the required shell thickness? I know that stiffening rings are used for vacuum cases, but just wondering if the same principle can be applied for wind load cases.
Thank you
I have some experience on general plant maintenance but I'm not a designer, so please forgive me if this is a really silly question. For tall vessels where the ruling design case is wind load bending moments, is it acceptable to weld on stiffening rings or lugs external to the vessel to reduce the required shell thickness? I know that stiffening rings are used for vacuum cases, but just wondering if the same principle can be applied for wind load cases.
Thank you





RE: Stiffening Ring on Vessel for Wind Loading Bending Moment Design?
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RE: Stiffening Ring on Vessel for Wind Loading Bending Moment Design?
Re-calculate the drag with the new cross-section area and the new CD, then use the slightly larger rib that will be required.
Stitch welding probably adequate - the outside welds will not be pressure tight.
RE: Stiffening Ring on Vessel for Wind Loading Bending Moment Design?
Thank you.
RE: Stiffening Ring on Vessel for Wind Loading Bending Moment Design?
Theoretically, you can add vertical stiffeners to a cylindrical shell for increased axial load capacity. For new construction, it is generally going to be cheaper to increase the metal thickness than to build up a composite section. In analyzing the stiffened structure, I don't think there is any standardized way to account for the increased stability, which is another drawback.
Note that the fluted-pedestal water towers use a similar concept to increase the strength of the pedestal (the pedestal is not pressurized in those tanks).