Page 97 - Pressure Vessel Design Manual

78 Pressure Vessel Design Manual

PROCEDURE 2-15

DESIGN OF LARGE OPENINGS IN FLAT HEADS 111

i
htegraC A
nozzle 1
Notation opening with €
& opening Loose- with-
P =internal pressure, psi
Mo =bending moment in head, in.-lb out nozzle
Mh = moment acting on end of hub or shell at juncture,
in.-lb
MD =component of moment M, due to HD, in.-lb
MT =component of moment M, due to HT, in.-lb
H =hydrostatic end force, lb
HD =hydrostatic end force on area of central opening, lb
HT=H-HD, lb
SH =longitudinal hub stress, psi
SR =radial stress in head, psi
ST =tangential stress in head, psi B
SHS =longitudinal hub stress, shell, psi Ho
SRS =radial stress, head, at O.D., psi
STS =tangential stress, head, at O.D., psi
SHO = longitudinal hub stress at central opening, psi
SRO = radial stress, head, at central opening, psi
STO =tangential stress, head, at central opening, psi
Z, Z1, Y, T, U, F, V, f, e, d, L, XI, and 8 are all factors.
H
Factor Formulas
1. Calculate geometry factors:

Figure 2-51. Dimensions (A) and loading diagram (B) for a flat integral
head with opening.

3. Using the values found in the preceding steps, compute
the following factors:

2. Using the factors calculated in Step 1, find the follow-
ing factors in Procedure 2-7.

Z=
Y=
T= te + 1 t3
U= L=- T f-=
d
F=
V= z1=- 2K2 -
-
f= K2 - 1