Vessel Design for -95¦C Temperature
Vessel Design for -95¦C Temperature
(OP)
If I would like to avoid impact test of the vessel with MDMT = -95°C by using SA-516 Gr 70 material. What is the minimum wall thickness of the vessel to order to meet ASME code? The design pressure is only 50 kPa. Thanks for your help.





RE: Vessel Design for -95¦C Temperature
RE: Vessel Design for -95¦C Temperature
Why????? I would suggest you review ASME B&PV Code, Section VIII, Div 1.
RE: Vessel Design for -95¦C Temperature
Regards
StoneCold
RE: Vessel Design for -95¦C Temperature
Thickness is based on pressure and diameter (and temperature); you've only provided pressure.
RE: Vessel Design for -95¦C Temperature
The diameter is 20"ID. I've read ASME B&PV Code Section 8 Div 2, it indicates that I can reduce the MDMT to -104°C, as long as the stress ratio is below 0.24 (3.11.2.5). There are 3 equations to calculate stress ratio, which one I should use?
RE: Vessel Design for -95¦C Temperature
RE: Vessel Design for -95¦C Temperature
RE: Vessel Design for -95¦C Temperature
RE: Vessel Design for -95¦C Temperature
You must qualify your welding procedures with impact testing at -95 C in weld metal and the HAZ of the SA-516-70 material. While you can select a weld filler metal that will meet the impact test requirements at -95 C, the HAZ is incapable of meeting the Code mandated absorbed energy requirements.