Maximum Allowable Stress Values ASME Pressure Vessel Code

ASME Pressure Vessel Design and Engineering

ASME Pressure Vessel Code Maximum Allowable Stress Values:

The maximum allowable stress values to be used in the calculation of the vessel’s wall thickness are given in the ASME Code for many different materials. These stress values are a function of temperature.

Material
Spec.
No.
Grade
Division 1
-20°F to
-650°F
Division 2
-20°F to
-650°F
Carbon Steel Plates and Sheets
SA-516
55
13,800
18,300
60
15,000
20,000
65
16,300
21,700
70
17,500
23,300
SA-285
A
11,300
15,000
B
12,500
16,700
C
13,800
18,300
SA-36
-
12,700
16,900
SA-203
A
16,300
21,700
B
17,500
23,300
D
16,300
21,700
E
17,500
23,300

High Alloy Steel Plates

SA-240
304
1,200
20,000
304L
-
16,700
316
12,300
20,000
316L
10,200
16,700

Division 1: Governs the design by “Rules”, is less stringent from the standpoint of certain design details and inspection procedures, and thus incorporates a higher safety factor of 4. For example, if a 60,000 psi tensile strength material is used, the Maximum Allowable Stress Value is 15,000 psi.

Division 2: Governs the design by “Analysis" and incorporates a lower safety factor of 3. Thus, the maximum allowable stress value for a 60,000 psi tensile strength material will become 20,000 psi.

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