Section VIII Div.1 - drainage
Section VIII Div.1 - drainage
(OP)
The channel side of U-tube heat exchanger under corrosive service has a nozzle located at hill side. The lowest edge of nozzle is higher 0.7 inch than the lowest point.
"UG-25(f),Sec. Viii div.1, requires ' Vessels subject to corrosion shall be supplied with a suitable drain openin at the lowest point practicable in the vessel'
1) In the above case, may the bolted channel cover be considered as drain opening?
2) or does an additional drain opening have to be provided at lowest point in the channel?
Thank you.
"UG-25(f),Sec. Viii div.1, requires ' Vessels subject to corrosion shall be supplied with a suitable drain openin at the lowest point practicable in the vessel'
1) In the above case, may the bolted channel cover be considered as drain opening?
2) or does an additional drain opening have to be provided at lowest point in the channel?
Thank you.





RE: Section VIII Div.1 - drainage
If you can prove that the corrosive fluid remaining in the channel can be diluted, drained again and contain the spillage when opening the channel cover, then you may use the mentioned nozzle as drain nozzle in accordance with the code. However, this is still a distortion of the intent of the code...
cheers,
gr2vessels
RE: Section VIII Div.1 - drainage
I fully agree with your answer from an engineering point of view.
However, is this code violation?
Thanks.
hhssbb2206
RE: Section VIII Div.1 - drainage
You don't have a dedicated drain nozzle and the lowest point of your existing nozzle is at 18 mm above the vessel lowest point. Remember '..shall be supplied..'?
However, as I said, as long as you are not out to hurt someone and you can prove the user that it is safe to operate without the mentioned drain nozzle, you can ignore the code. Please note that you will not convince any halfwit AI you can deviate from the code in this matter.
Good luck,
gr2vessels
RE: Section VIII Div.1 - drainage