The wall thickness of a vessel computed by these
rules shall be determined such that, for any combination
of loadings listed in UG-22 that induce primary stress
and are expected to occur simultaneously during normal
operation of the vessel, the induced maximum general
primary membrane stress does not exceed the maximum
allowable stress value in tension (see UG-23), except as
provided in (d) below. Except where limited by special
rules, such as those for cast iron in flanged joints, the
above loads shall not induce a combined maximum primary
membrane stress plus primary bending stress across the
thickness that exceeds 11⁄2 times11 the maximum allowable
stress value in tension (see UG-23). It is recognized that
high localized discontinuity stresses may exist in vessels
designed and fabricated in accordance with these rules.
Insofar as practical, design rules for details have been
written to limit such stresses to a safe level consistent with
experience
The wall thickness of a vessel computed by theserules shall be determined such that, for any combinationof loadings listed in UG-22 that induce primary stressand are expected to occur simultaneously during normaloperation of the vessel, the induced maximum generalprimary membrane stress does not exceed the maximumallowable stress value in tension (see UG-23), except asprovided in (d) below. Except where limited by specialrules, such as those for cast iron in flanged joints, theabove loads shall not induce a combined maximum primarymembrane stress plus primary bending stress across thethickness that exceeds 11⁄2 times11 the maximum allowablestress value in tension (see UG-23). It is recognized thathigh localized discontinuity stresses may exist in vesselsdesigned and fabricated in accordance with these rules.Insofar as practical, design rules for details have beenwritten to limit such stresses to a safe level consistent withexperience
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