BornTrucker
Mechanical
- Dec 17, 2018
- 8
Hypothetical situation:
I need to design a vertical vessel with MAWP of 1480 psig designed to handle water. The vessel is 100 feet tall and will have a drain welded to the bottom with a flange. Ballpark numbers tell me during operation at the MAWP when full of water, the vessel will see 1523 psig due to process pressure and static head. The MAWP of the vessel is 1480, am I allowed to use Class 600 flanges? The flanges aren't limiting the MAWP as it is measured from the top of the vessel, not the bottom.
The pressure exceeds the rating for these flanges so I believe the answer is I must use Class 900 flanges.
If this is the case, my suggestion would be to rate the vessel to 1436 psig if class 600 flanges are required. 1480 - 43(hydrostatic head)
Thanks!
I need to design a vertical vessel with MAWP of 1480 psig designed to handle water. The vessel is 100 feet tall and will have a drain welded to the bottom with a flange. Ballpark numbers tell me during operation at the MAWP when full of water, the vessel will see 1523 psig due to process pressure and static head. The MAWP of the vessel is 1480, am I allowed to use Class 600 flanges? The flanges aren't limiting the MAWP as it is measured from the top of the vessel, not the bottom.
The pressure exceeds the rating for these flanges so I believe the answer is I must use Class 900 flanges.
If this is the case, my suggestion would be to rate the vessel to 1436 psig if class 600 flanges are required. 1480 - 43(hydrostatic head)
Thanks!