API 653 floor replacement
API 653 floor replacement
(OP)
We have a 650 tank which already has been a second floor installed on top of the original following API 653. We installed a leak detection system between the two floors and lately it was noted that there was a leak. Tank was internally inspected and we are considering a new floor replacement.
Somebody put on the table the idea of installing a 3rd floor on top of the other two. I have looked at the Code and did not find anything against this if all previsions are followed. Still I don't feel 100% comfortable with the idea because I think this 3rd floor may lack proper support.
Due to the nature of the contents that have leaked between the two floors there is some concern on welding to the second floor. This is the reason why this idea was presented.
Anybody had done this before? Any feedback?
Somebody put on the table the idea of installing a 3rd floor on top of the other two. I have looked at the Code and did not find anything against this if all previsions are followed. Still I don't feel 100% comfortable with the idea because I think this 3rd floor may lack proper support.
Due to the nature of the contents that have leaked between the two floors there is some concern on welding to the second floor. This is the reason why this idea was presented.
Anybody had done this before? Any feedback?





RE: API 653 floor replacement
RE: API 653 floor replacement
RE: API 653 floor replacement
With a water problem, if you go to a third floor put a slope on it and put in a draw-off sump. Either coat that sump or make it out of stainless steel.
RE: API 653 floor replacement
RE: API 653 floor replacement
We are considering the repair options at this time. No decision has yet been made.
RE: API 653 floor replacement
In your first post you say "We have a 650 tank which already has been a second floor installed on top of the original following API 653."
API 653 9.10.2.1.1 Suitable noncorrosive material cushion such as sand, gravel, or concrete shall be used between the old
bottom and the new bottom.
Even if the two bottoms are very close together ( 1" apart is not that uncommon ) there should be material between the steel plates.
RE: API 653 floor replacement
Do NOT use steam for cleaning & purging, ruined a double-wall tank doing just that. 3/4" hose of 50-100# steam with only one 1/2"NPT outlet open. Inner tank walls crumpled and floor humped up. I love operators.
RE: API 653 floor replacement
As I said. We are considering options. Still has not been decided if it will be repaired or replaced.
RE: API 653 floor replacement