Page 40 - Design Criteria.qxd

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N
Basic Gasket Seating Width, b
o
Facing Sketch
Exaggerated
Column I
Column II
(1a)
(1b)
See Note (2)
(1c)
w < N
(1d)
w < N
See Note (2)
(2)
w < N/2
(3)
w < N/2
(4)
See Note (2)
(5)
See Note (2)
(6)
Effective Gasket Seating Width, b
b = b
o
, when b
o
< 1/4”; b = 0.5 b
o
, when b
o
> 1/4”
Location of Gasket Load Reaction
ASME Boiler and Pressure Vessel Code Calculations
Effective Gasket Seating Width - See Note (1)
N
N
N
N
W
T
N
W
T
N
N
W
N
W
1/64” Nubbin
N
W
1/64” Nubbin
For b
o
> 1/4”
O.D. Contact Face
H
G
h
G
G
For b
o
< 1/4”
H
G
h
G
G
Gasket
Face
C
b
N
2
N
2
W + T
2
W + N
4
max.
;
(
)
W + T
2
W + N
4
max.
(
;
W + N
4
W + 3N
8
N
4
3N
8
3N
8
7N
16
N
4
3N
8
W
8
Notes:
(1) The gasket factors listed only apply to flanged joints in which the gasket is contained entirely within the inner edges of the bolt holes.
(2) Where serrations do not exceed 1/64” depth and 1/32” width spacing, sketches (1b) and (1d) shall be used.
)