large api620 tanks
large api620 tanks
(OP)
The largest API620 tanks I have designed in the past were around 30ft and had self supporting cone or dome roofs. For API650 tanks, I have designed them to 120ft with supporting roof. No problem. However, I now have to consider the possiblility of changing several 100ft diameter API650 tanks (with Appendix F)into full blown API-620 design because process engineers want to increase the pressure!
I don't have experience with this large diameter API620 design. Can the more experienced tank engineers confirm for me if I can still have a supported roof (ie. internal rafters & columns) and still be an API-620 design? I think it is possible as long as I meet the top shell course's compression area requirements and the roof and shell thickness is sufficient to resist the internal pressure.
Would the fabrication cost of an API-620 design be much more than an API-650 design? Thanks.
I don't have experience with this large diameter API620 design. Can the more experienced tank engineers confirm for me if I can still have a supported roof (ie. internal rafters & columns) and still be an API-620 design? I think it is possible as long as I meet the top shell course's compression area requirements and the roof and shell thickness is sufficient to resist the internal pressure.
Would the fabrication cost of an API-620 design be much more than an API-650 design? Thanks.





RE: large api620 tanks
Joe Tank
RE: large api620 tanks
I was hoping you would share your input. Thank you.
Your input give me some confidence that my thinking is correct in that a supported roof can be used in API620. But as such, why would the building of the dome roof be challenging, and may even require air-lifted into position? I would think they can weld the roof plates together while the plates rests right on the roof rafters. The plate will not be welded to the rafters flanges of course.
Thanks again, Joe.
RE: large api620 tanks
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RE: large api620 tanks
Joe Tank