ASME Section VIII div 2 2010. ASME Boiler and Pressure Vessel Code. Alternative Rules
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2010 SECTION VIII, DIVISION 2
3-59
Nominal Governing Thickness, in.
01234
Minimum Design Metal Temperature, °F
-80
-60
-40
-20
0
20
40
60
80
100
120
Impact Testing Required
A
D
B
C
Figure 3.8 – Impact Test Exemption Curves - Parts Subject to PWHT and Non-welded Parts
2010 SECTION VIII, DIVISION 2
3-60
Nominal Governing Thickness, mm
0 102030405060708090100
Minimum Design Metal Temperature, °C
-60
-40
-20
0
20
40
60
Impact Testing Required
A
B
C
D
Figure 3.8M – Impact Test Exemption Curves - Parts Subject to PWHT and Non-welded Parts
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2010 SECTION VIII, DIVISION 2
3-61
Material Assignment Table
Based on Exemption Curves and Notes for Figures 3.7, 3.7M, 3.8, and 3.8M
Curve Material Assignment
A
a) All carbon and all low alloy steel plates, structural shapes and bars not listed in Curves B, C, and D below.
b) SA-216 Grades WCB and WCC if normalized and tempered or water-quenched and tempered; SA -217 Grade
WC6 if normalized and tempered or water-quenched and tempered
B
a) SA-216 Grades WCA if normalized and tempered or water-quenched and tempered; Grades WCB and WCC for
thicknesses not exceeding 50 mm (2 in.) if produced to a fine grain practice and water-quenched and tempered
b) SA -217 Grade WC9 if normalized and tempered
c) SA-285 Grades A and B
d) SA-414 Grade A
e) SA-515 Grades 60
f) SA-516 Grades 65 and 70 if not normalized
g) SA-662 Grade B if not normalized
h) SA/EN 10028-2 Grade P355GH as-rolled
i) Except for cast steels, all materials of Curve A if produced to fine grain practice and normalized which are not listed
for Curve C and D below;
j) Pipe, fittings, forgings, and tubing not listed for Curves C and D below;
k) Parts permitted from paragraph 3.2.8, shall be included in Curve B even when fabricated from plate that otherwise
would be assigned to a different curve.
C
a) SA-182 Grades F21 and F22 if normalized and tempered.
b) SA-302 Grades C and D
c) SA-336 Grades F21 and F22 if normalized and tempered, or liquid quenched and tempered.
d) SA-387 Grades 21 and 22 if normalized and tempered, or liquid quenched and tempered.
e) SA-516 Grades 55 and 60 if not normalized
f) SA-533 Grades B and C
g) SA-662 Grade A
h) All materials listed in (a) through (g) and in (i) for Curve B if produced to fine grain practice and normalized,
normalized and tempered, or liquid quenched and tempered as permitted in the material specification, and not
listed for Curve D below
D
a) SA-203
b) SA-508 Class 1
c) SA-516 if normalized
d) SA-524 Classes 1 and 2
e) SA-537 Classes 1, 2, and 3
f) SA-612 if normalized; except that the increased Cb limit in the footnote of Table 1 of SA-20 is not permitted
g) SA-662 if normalized
h) SA-738 Grade A
i) SA-738 Grade A with Cb and V deliberately added in accordance with the provisions of the material specification,
not colder than -29
°C (-20°F)
j) SA-738 Grade B not colder than -29°C (-20°F)
k
)
SA/EN 10028-2 Grade P355GH if normalized [See Note d)3)]
Notes
a) Castings not listed as Curve A and B shall be impact tested
b) For bolting see paragraph 3.11.6.
c) When a class or grade is not shown in a material assignment, all classes and grades are indicated.
d) The following apply to all material assignment notes.
1) Cooling rates faster than those obtained in air, followed by tempering, as permitted by the material specification, are
considered equivalent to normalizing and tempering heat treatments.
2) Fine grain practice is defined as the procedures necessary to obtain a fine austenitic grain size as described in SA-20.
3) Normalized rolling condition is not considered as being equivalent to normalizing.
e) Data of Figures 3.7 and 3.7M are shown in Table 3.14.
f) Data of Figures 3.8 and 3.8M are shown in Table 3.15.
g)
See paragraph 3.11.2.5.a.5.ii for yield strength greater than 450 MPa (65 ksi).
2010 SECTION VIII, DIVISION 2
3-62
t
g1
=t
a
t
g2
=t
a
(seamless) or t
b
(welded)
(a) Butt Welded Components
t
a
2
(b) Welded Connection with or without a Reinforcing Plate
Section X-X
X
X
1
t
g1
= min (t
a
, t
c
)
t
g2
= min (t
b
, t
c
)t
g3
=min (t
a
, t
b
)
t
c
t
a
t
c
t
b
t
a
t
c
t
b
t
a
t
b
1
2
3
t
b
Figure 3.9 – Typical Vessel Details Illustrating The Governing Thickness
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2010 SECTION VIII, DIVISION 2
3-63
Groove
1
t
a
2
t
c
Groove
t
a
1
2
t
b
(a) Bolted Flat Head or Tubesheet and Flange (b) Integral Flat Head or Tubesheet
Groove
t
a
A
1
2
t
b
(c) Flat Head or Tubesheet with a Corner Joint
t
g2
=t
c
t
g2
=t
b
t
g1
= t
a
/4 (for welded or nonwelded)
t
g2
=min (t
a
, t
b
)
Note: The governing thickness of the integral
flat head or tubesheet is max (t
g1
, t
g2
)
Note: The governing thickness of the integral
flat head or tubesheet is max (t
g1
, t
g2
)
t
g1
= t
a
/4 (for welded or nonwelded)
t
g1
= t
a
/4 (for welded
or nonwelded)
Figure 3.10 – Typical Vessel Details Illustrating the Governing Thickness
2010 SECTION VIII, DIVISION 2
3-64
(a) Welded Attachments
1
Pressure Containing Part
Pressure Containing Part
t
g1
=min(t
a
, t
b
)
1
1
t
b
t
g1
=min (t
a
, t
c
)
t
a
t
c
1
(b) Integrally Reinforced Welded Connection
t
b
t
a
t
a
Figure 3.11 – Typical Vessel Details Illustrating the Governing Thickness
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2010 SECTION VIII, DIVISION 2
3-65
Temperature Reduction - T
R
, °F
0 20406080100
Stress Ratio - R
ts
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
50 ksi≤
50 , 65ksi ksi>≤
See paragraph 3.11.2.5.a.5.i when R
ts
is less than or equal to 0.24
Figure 3.12 – Reduction in the MDMT without Impact Testing – Parts Not Subject to PWHT
2010 SECTION VIII, DIVISION 2
3-66
Temperature Reduction - T
R
, °C
0 102030405060
Stress Ratio - R
ts
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
345 , 450MPa MPa>≤
345 MPa≤
See paragraph 3.11.2.5.a.5.i when R
ts
is less than or equal to 0.24
Figure 3.12M – Reduction in the MDMT without Impact Testing – Parts Not Subject to PWHT
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2010 SECTION VIII, DIVISION 2
3-67
Temperature Reduction - T
R
, °F
0 20406080100
Stress Ratio - R
ts
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
See paragraph 3.11.2.5.a.5.i when R
ts
is less than or equal to 0.24
50 , 65ksi ksi>≤
50 ksi≤
Figure 3.13 – Reduction in the MDMT without Impact Testing - Parts Subject to PWHT and Non-welded
Parts
2010 SECTION VIII, DIVISION 2
3-68
Temperature Reduction - T
R
, °C
0 102030405060
Stress Ratio - R
ts
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
345 , 450MPa MPa>≤
345 MPa≤
See paragraph 3.11.2.5.a.5.i when R
ts
is less than or equal to 0.24
Figure 3.13M – Reduction in the MDMT without Impact Testing - Parts Subject to PWHT and Non-
welded Parts
Notes for Figures 3.12, 3.12M, 3.13, and 3.13M
a) Interpolation between yield strength values is permitted.
b) The reduction in MDMT shall not exceed 55 ºC (100 ºF), except as permitted by paragraph 3.11.2.5.a.5.i.
c) Data of Figures 3.12 and 3.12M are shown in Table 3.16.
d) Data of Figures 3.13 and 3.13M are shown in Table 3.17.
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