Design & Thermal, Stress and Buckling Analysis to ASME Section VIII Divisions 1 and 2
We performed the FEA design and (thermal, stress and buckling) analysis of a chemical tubular reactor. The reactor was designed to meet the requirements of ASME Section VIII, Division 1 Code.
Thermal and structural finite element analyses was performed (in accordance with the ASME Code, Section VIII, Division 2) for the following load types:
- Design conditions
- Operating transient conditions for start up, steady operation and shut-down (including normal and upset conditions)
The shells, channels and tubesheets of the reactor and the preheater are made of low yield strength Carbon Steel SA-516 Grade 70 to protect the vessels against stress corrosion cracking. For reactor operating temperatures of 500 to 600 °F, the minimum yield strength of the SA-516, Grade 70 steel remains within 29 to 31 ksi.
Tubes arranged in triangular patterns are made of Duplex stainless steel SA-789 Grade 31803. The spaces between the tubes in the outer regions of the reactor tubesheets were increased to meet the ASME Code allowables for the higher stresses in these regions without increasing the thickness of the entire plate. Based on the analyses of the reactor according to the Division 2, the design of the highly stressed local regions was modified to meet ASME Code, Section VIII, Division 2 stress allowables.
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