API BULL 2U Bulletin on Stability Design of Cylindrical Shells
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API BULL 2U Document Information:
Title
Bulletin on Stability Design of Cylindrical Shells
American Petroleum Institute
Publication Date:
Jun 1, 2004
Scope:
This Bulletin provides stability criteria for determining the
structural adequacy against buckling
of large diameter circular cylindrical members when subjected to axial
load, bending, shear and
external pressure acting independently or in combination. The
cylinders may be unstiffened,
longitudinally stiffened, ring stiffened or stiffened with both
longitudinal and ring stiffeners.
Research and development work leading to the preparation and issue of
all three editions of this
Bulletin is documented in References 1 through 16 and the Commentary.
The buckling capacities of the cylinders are based on linear
bifurcation (classical) analyses
reduced by capacity reduction factors which account for the effects of
imperfections and
nonlinearity in geometry and boundary conditions and by plasticity
reduction factors which account
for nonlinearity in material properties. The reduction factors were
determined from tests conducted
on fabricated steel cylinders. The plasticity reduction factors
include the effects of residual
stresses resulting from the fabrication process.
Fabricated cylinders are produced by butt-welding together cold or hot
formed plate materials. Long
fabricated cylinders are generally made by butt-welding together a
series of short sections,
commonly referred to as cans, with the longitudinal welds rotated
between the cans. Long fabricated
cylinders generally have D/t ratios less than 300 and are covered by
AP RP 2A.
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