Page 195 - Pressure Vessel Design Manual

Design of Vessel Supports 173

Note: If shell is stiffened or A > OSR, S1l = 0.

Circumferential Tension/Compression
e S6, tangential shear-s ?11 not stiffened, A > 0.5R.
e S12, circumferential compression

e Si, tangential shear-shell not stiffened, A 5 0.5R.
Note: t, = t, + t, only if wear plate is attached to shell and
width of wear plate is a minimum of b + 1.566.
e SI5 circumferential stress in shell with stiffener (see
Note 8).
e Sri, tangential shear in heact-shell not stiffened, A p 0.5R.
K3Q
s(q = -
rth
Note: If shell is stiffened or A > OSR, S8 = 0.
Note: Add second expression if vessel has an internal
stiffener, subtract if vessel has an external stiffener.
Circumferential Bending
SI*, circumferential compressive stress in stiffener (see
e S9, circumferential bending at horn of saddle-.yhell not Note 8).
stigened (L 2 8R).

Q 3KsQ
s9 = (-> --
4t,(b + 1.56a 2t:
Note: t, = t, + t, and tf = t: + only if A p 0.5R and
wear plate extends W10 above horn of saddle. Pressure Stresses
e SIC,, circumferential bending at horn ofsaddle-shell not
stiffened (L < 8R).
Q 12KsQH
SI0 = (-1 - 7
4t,(b + 1.56&)

Note: Requirements for t, are same as for Sg.

Additional Tension Stress in Head

SI1, additional tension stress in head-shell not stiffened,
A 5 0.5R.
oh = a&, maximum circumferential stress in head is equal to
JGQ hoop stress in shell
SI1 =-
rth