Page 77 - Pressure Vessel Design Manual

58 Pressure Vessel Design Manual

PROCEDURE 2-9
DESIGN OF BLIND FLANGES WITH OPENINGS [ 1, 41

I1 DESIGN CONDITIONS
Designpressure, P I 1 Allowable slr6cMI.
Desian temoerature I flange I Bolting
I mama material I IDesian temn.. stn I IDesian temo., sh I
Boning material IAtm. temp., sl. I IAtm. temp., S. I

3 TABLES 2-3 AND 24 4 LOAD AND BOLT CALCULATIONS
N WM = bffiy A,,, = greater of
b Hp I 2bdmP ' WdS. or Wmd%
G (see below) H = G2rP14 Ab
Y Wmi = Hp + H W O.!5(Am + &)Sa
m hG = 0.qC - G)

Figure 2-22. Dimensional data and forces for a blind
Bolts: NO.- __ flange.
- ma.--
R- -
Greater of d
orA.+I,,+t

Reinforcement
PR, A3 = 2tnh
L=- SE - 0.6P A4 = area of welds
4 P0.W & = L(0.D. pad - O.D. node)
A1 =(t-tO)(h-d) EA = A, through A5
Az = 2h(t, - m) EA >Ar

Notes Option 2-If opening exceeds one-half the nominal
flange dameter, the flange may be computed as an
1. Reinforcement is only required for operating condi- optional-type reducing flange.
tions not bolt up. Option &No additional reinforcement is required if to
2. Options in lieu of calculating reinforcement: is calculated substituting 0.6 for 0.3 in the equation
Option 1-No additional reinforcement is required if for to (doubling of c value).
flange thickness is greater than 1.414 to. 3. For terms and Tables 2-3 and 2-4. see Procedure 2-7.