sshep
Chemical
- Feb 3, 2003
- 761
Gentlemen,
I am a process engineer who has recieved a proposed design for a distillation tower 114.8m tall by 5.6m in diameter. By company standards, this vessel must be designed to be hydrotested in the vertical position. The proposed design pressure is 400kPa. I want 600kPa to reduce the relief requirements. The vessel will not be liquid full during relief.
Considering the vessel bottom has a field hydrotest pressure of 1660kPa at the bottom, there is plenty of shell metal thickness over all but the top 20 meters of the vessel to meet a 600kPa rating. Is there any way to get a 600kPa rating without adding shell thickness to the whole tower, and still meet ASME VIII D1 code requirements; and (if possible) the company vertical hydrotest specification?
Any help appreciated.
best wishes,
sshep
I am a process engineer who has recieved a proposed design for a distillation tower 114.8m tall by 5.6m in diameter. By company standards, this vessel must be designed to be hydrotested in the vertical position. The proposed design pressure is 400kPa. I want 600kPa to reduce the relief requirements. The vessel will not be liquid full during relief.
Considering the vessel bottom has a field hydrotest pressure of 1660kPa at the bottom, there is plenty of shell metal thickness over all but the top 20 meters of the vessel to meet a 600kPa rating. Is there any way to get a 600kPa rating without adding shell thickness to the whole tower, and still meet ASME VIII D1 code requirements; and (if possible) the company vertical hydrotest specification?
Any help appreciated.
best wishes,
sshep
