Converting API 650 to API 620 tank
Converting API 650 to API 620 tank
(OP)
Guys,
Has anyone ever looked into/done this before? The 650 tanks are on the smaller side (50,000 bpd working capacity) so I am thinking it is at least possible and not out of the realm of possibility.
David Rials.
Has anyone ever looked into/done this before? The 650 tanks are on the smaller side (50,000 bpd working capacity) so I am thinking it is at least possible and not out of the realm of possibility.
David Rials.





RE: Converting API 650 to API 620 tank
The problem is that API-620 has requirements about how a tank is built- not just the completed geometry, but the inspections that are to be done in the construction process, etc. If that isn't done, there's no way to do it after the fact.
It's a similar issue, to if a tank is not built to any standard, can you go back after the fact and make it meet API-650 or ASME or whatever? You can correct obvious deficiencies, you can evaluate the design, but can't go back and change the past and cause it to have been made a particular way.
RE: Converting API 650 to API 620 tank
What is the intended outcome? Is the owner looking for additional working pressure?
RE: Converting API 650 to API 620 tank
RE: Converting API 650 to API 620 tank
The radiography is an issue, and the more and better records you have of how that was done, the better. The general issue is you have requirements for "one shot in the first 10' welded" and have no idea what sequence it was all welded in, or who welded what, etc. Any requirements for inspection of the root pass, gauging material, etc., become a problem after it's all finished.
The allowable stresses and the impact testing exemptions are considerably different between the two codes, with API-620 being more conservative in both cases.
RE: Converting API 650 to API 620 tank
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.