ASME Section VIII div 2 2010. ASME Boiler and Pressure Vessel Code. Alternative Rules
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2010 SECTION VIII, DIVISION 2
4-25
Table 4.2.4 – Some Acceptable Weld Joints For Shell Seams
Detail
Joint
Type
Joint
Category
Design Notes Figure
8 1 B
•
1
max 0.8 ,
rn pipe
ttt
⎡⎤
≥
⎣⎦
•
30
α
≤°
•
,14 18.5
β
β
°≤ ≤ °
• r, 6 mm (0.25 in.) min. radius
• Joint Types 2 and 3 may be
permissible, see paragraphs
4.2.5.2 through 4.2.5.6 for
limitations
t
pipe
β
r
t
rn
α
t
n
α
β
r
9 1 B
•
0
30
α
≤
• see paragraph 4.2.5.3.f
• Joint Types 2 and 3 may be
permissible, see paragraphs
4.2.5.2 through 4.2.5.6 for
limitations
10 8 B
•
0
30
α
>
11 1 B
•
0
30
α
≤
• see paragraph 4.2.5.3.f
• Joint Types 2 and 3 may be
permissible, see paragraphs
4.2.5.2 through 4.2.5.6 for
limitations
12 8 B
•
0
30
α
>
C
L
t
v
t
c
α
C
L
t
c
α
t
v
2010 SECTION VIII, DIVISION 2
4-26
Table 4.2.5 – Some Acceptable Weld Joints For Formed Heads
Detail
Joint
Type
Joint
Category
Design Notes Figure
1 1 A,B
• Joint Types 2 and 3 may be
permissible, see paragraphs
4.2.5.2 through 4.2.5.6 for
limitations
2 1 A,B
•
3ab≥
when
h
t
exceeds
s
t
.
•
()
0.5
off h s
ttt≤−
• The skirt minimum length is
[
]
min 3 , 38 (1.5 )
h
tmmin
except
when necessary to provide the
required taper length
• If
1.25
hs
tt≤
, then the length of
the skirt shall be sufficient for any
required taper
• The length of the taper
a
may
include the width of the weld.
• The shell plate center line may be
on either side of the head plate
center line
• Joint Types 2 and 3 may be
permissible, see paragraphs
4.2.5.2 through 4.2.5.6 for
limitations
3 1 A,B
t
h
b
t
s
t
off
Thinner Part
Tangent Line
a
4 1 A,B
•
3ab≥
•
()
0.5
off h s
ttt≤−
• The length of the taper
a
may
include the width of the weld.
• The shell plate center line may be
on either side of the head plate
center line
• Joint Types 2 and 3 may be
permissible, see paragraphs
4.2.5.2 through 4.2.5.6 for
limitations
t
s
t
h
t
h
t
s
t
off
b
Thinner Part
Tangent Line
a
Thinner Part
b
t
h
t
off
t
s
a
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2010 SECTION VIII, DIVISION 2
4-27
Table 4.2.5 – Some Acceptable Weld Joints For Formed Heads
Detail
Joint
Type
Joint
Category
Design Notes Figure
5 1 A,B
6 2 B
• Butt weld and , if used, fillet weld
shall be designed to take a shear
load at 1.5 times the design
differential pressure
•
[
]
min 2 , 25 (1 )
h
atmmin≥
• b, 13 mm (0.5 in.) minimum
• The shell thicknesses
1
s
t
and
2
s
t
may be different
•
,15 20
α
α
°≤ ≤ °
t
h
Seal Or Fillet Weld
Butt Weld
Tangent Point
α
aa
b
t
s2
t
s1
ID
7 1 A,B
•
12
2rr≥
•
[
]
2
min ,
s
h
rtt≥
Thinner Part
t
off
t
h
t
s
a
b
Forged Part
r
2
t
h
r
1
t
s
2010 SECTION VIII, DIVISION 2
4-28
Table 4.2.6 – Some Acceptable Weld Joints For Unstayed Flat Heads, Tubesheets Without A Bolting
Flange, And Side Plates of Rectangular Pressure Vessels
Detail
Joint
Type
Joint
Category
Design Notes Figure
1 7 C
•
2
s
at≥
•
ws
tt≥
2 7 C
•
2
s
ab t+≥
•
ws
tt≥
•
[
]
min , 6 (0.25 )
ps
ttmmin≥
• The dimension
b
is produced by
the weld preparation and shall be
verified after fit-up and before
welding
3 7 C
•
2
s
ab t+≥
•
0b =
is permissible
• The dimension
b
is produced by
the weld preparation and shall be
verified after fit-up and before
welding
t
s
t
w
a
t
s
t
w
a
b
t
p
t
s
a
b
This Weld Metal May Be
Deposited Before
Completing the Joint
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2010 SECTION VIII, DIVISION 2
4-29
Table 4.2.7 – Some Acceptable Weld Joints With Butt Weld Hubs
Detail
Joint
Type
Joint
Category
Design Notes Figure
1 1 C
•
10 (0.375 .)rmm in≥
for
38 (1.5 )
s
tmmin≤
•
[
]
min 0.25 , 19 (0.75 )
s
rtmmin≥
for
38 (1.5 )
s
tmmin>
2 1 C
•
10 (0.375 .)rmm in≥
for
38 (1.5 )
s
tmmin≤
•
[
]
min 0.25 , 19 (0.75 )
s
rtmmin≥
for
38 (1.5 )
s
tmmin>
•
[
]
max ,
s
etT≥
3 1 C
•
[
]
max 1.5 , 19 (0.75 )
s
htmmin=
but need not exceed
51 (2 )mm in
r
Tension Test Specimen
t
s
r
Tension Test Specimen
t
s
e
Tension Test Specimen
t
s
h
2010 SECTION VIII, DIVISION 2
4-30
Table 4.2.8 – Some Acceptable Weld Joints For Attachment Of Tubesheets With A Bolting Flange
Detail
Joint
Type
Joint
Category
Design Notes Figure
1 7 C
•
2
s
ab t+≥
•
0b =
is permissible
• The dimension
b
is produced by
the weld preparation and shall be
verified after fit-up and before
welding
•
[
]
min 0.7 ,1.4
s
r
ctt≥
t
s
a
b
c
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2010 SECTION VIII, DIVISION 2
4-31
Table 4.2.9 – Some Acceptable Weld Joints For Flange Attachments
Detail
Joint
Type
Joint
Category
Design Notes Figure
1 10 C
• Loose Type Flange
•
0.7
cn
tt≥
•
6 (0.25 )
n
ct mm in≤+
maximum
•
[
]
1
max 0.25 ,5 (0.1875 .)rgmmin≥
2 10 C
• Loose Type Flange
•
0.7
cn
tt≥
•
6 (0.25 )
n
ct mm in≤+
maximum
3 7 C
• Loose Type Flange
•
0.7
cn
tt≥
•
0.5ct≤
maximum
•
[
]
1
max 0.25 ,5 (0.1875 .)rgmmin≥
c
t
c
T
t
n
2010 SECTION VIII, DIVISION 2
4-32
Table 4.2.9 – Some Acceptable Weld Joints For Flange Attachments
Detail
Joint
Type
Joint
Category
Design Notes Figure
4 7 C
• Loose Type Flange
•
0.7
cn
tt≥
•
0.5ct≤
maximum
c
t
c
T
5 7 C
• Loose Type Flange
•
0.7
cn
tt≥
•
5 (0.1875 .)
ln
tt mm in≥+
6 1 C
• Integral Type Flange
•
0
1.5cg≥
minimum
•
[
]
1
max 0.25 ,5 (0.1875 .)rgmmin≥
7 1 C
• Integral Type Flange
•
0
1.5cg≥
minimum
t
c
t
l
Gasket
t
n
Full Penetration Weld, Single
Or Double. The Full Penetration
Weld May Be Through The Lap
(t
l
) Or Through The Wall (t
n
).
This Weld May Be Machined
To A Corner Radius To Suit
Standard Lap Joint Flanges
T
g
o
Slope exceeds 1:3
c
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2010 SECTION VIII, DIVISION 2
4-33
Table 4.2.9 – Some Acceptable Weld Joints For Flange Attachments
Detail
Joint
Type
Joint
Category
Design Notes Figure
8 1 C
• Integral Type Flange
•
0
1.5cg≥
minimum
9 7 C
• Integral Type Flange
•
[
]
0
min 0.25 , 6 (0.25 )cgmmin≥
10 7 C
• Integral Type Flange
•
3+≥
n
ab t
•
[
]
min , 6 (0.25 .)≥
pn
ttmmin
•
[
]
min , 6 (0.25 .)≥
n
ctmmin
g
o
Slope exceeds 1:3
c
C Weld
L
Slope 1:3 max.
T
t
n
c
2010 SECTION VIII, DIVISION 2
4-34
Table 4.2.10 – Some Acceptable Full Penetration Welded Nozzle Attachments Not Readily
Radiographable
Detail
Joint
Type
Joint
Category
Design Notes Figure
1 7 D
•
[
]
min 0.7 ,6 (0.25 )
cn
ttmmin≥
•
(
)
1
min 0.25 ,3 0.125rtmmin≥⎡ ⎤
⎣⎦
2 7 D
•
[
]
min 0.7 ,6 (0.25 )
cn
ttmmin≥
•
(
)
1
min 0.25 ,3 0.125rtmmin≥⎡ ⎤
⎣⎦
3 7 D
•
[
]
min 0.7 ,6 (0.25 )
cn
ttmmin≥
•
(
)
1
min 0.25 ,3 0.125rtmmin≥⎡ ⎤
⎣⎦
4 7 D
•
[
]
min 0.7 ,6 (0.25 )
cn
ttmmin≥
•
(
)
1
min 0.25 ,3 0.125rtmmin≥⎡ ⎤
⎣⎦
r
1
t
t
n
t
c
t
n
r
1
t
t
c
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