TABLE 2-2
STRESS INTENSITY k FACTORS FOR VARIOUS LOAD COMBINATIONS
Condition
Load Combination
k Factors
Calculated Stress
(See AD-110)
Limit Basis
Design
A The design pressure, the dead
1.0
Based on the corroded
load of the vessel, the contents
thickness at design
of the vessel, the imposed load
metal temperature
of the mechanical equipment, and
external attachment loads
B Condition A plus wind
1.2
Based on the corroded
load
thickness at design
metal temperature
C Condition A plus earth-
1.2
Based on the corrode
quake load
thickness at design
metal temperature
D Condition A plus loads
1.2
Based on the corrode
resulting from wave action
thickness at design
metal temperature
(NOTE: The condition of
structural instability or
buckling must be considered)
Operation
A The actual operating loading
See AD-160
Based on corroded
conditions. This is the basis
and Appen-
thickness at
of fatigue life evaluation
dix 5
operating pres-
sure and metal
operating temp-
erature
Test
A The required test pressure, the 1.25 for hy-
Based on actual
dead load of the vessel, the
drostatic test design values at
contents of the vessel, the
and 1.15 for
test temperature
imposed load of the mechanical
pneumatic test.
equipment, and external attach- See AD-151 for
ment loads
special limits.
NOTE:
(1) When the rules of this Division are used in design of human occupancy
pressure vessels and/or pressure vessels permanently installed in ocean-
going ships, barges, and other floating craft [per AG-100(b)(2)], dynamic
loads resulting from wave action included under Conditions D shall be the
most probable largest loads encountered during the vessel's life and having
a probability level per wave encounter not greater than 10 -8, which
corresponds to one occurrence in 20 years.
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