Tank Settlement after Moving
Tank Settlement after Moving
(OP)
Hi,
We have a situation where a 20 yr old tank was moved in order to replace liner. We had an API 653 on tank in old location in 2003 and it showed several locations (3 stations) with higher than acceptable edge settlement. This summer the tank was moved. We did hydrotest, and an API inspection. The tank has edge settlement now in only one location and not too much of it(2.4 inches versus 2 inch allowable. API report says to replace that one floor plate as it was under strain. We are wondering if this strain and continued deflection/settlement was caused by the move but we really have no way to find out, do we? We did not have an API done just before moving the tank in spring-perhaps we should have?
We have a situation where a 20 yr old tank was moved in order to replace liner. We had an API 653 on tank in old location in 2003 and it showed several locations (3 stations) with higher than acceptable edge settlement. This summer the tank was moved. We did hydrotest, and an API inspection. The tank has edge settlement now in only one location and not too much of it(2.4 inches versus 2 inch allowable. API report says to replace that one floor plate as it was under strain. We are wondering if this strain and continued deflection/settlement was caused by the move but we really have no way to find out, do we? We did not have an API done just before moving the tank in spring-perhaps we should have?





RE: Tank Settlement after Moving
The APIGUY....
RE: Tank Settlement after Moving
When replacing the plate in the bulged area, you must repair the backfill underneath the plate, for instance by removing the existing up to 0,20 m deep and replacing by sand + 4 % cement compacted backfill prio to reinstall the new plate.
You should have perform an API 653 - Appendix B settlement outside survey on the tank in service in order to check the compliance of tank foundation in order to repair it (whether necessary) during the shut down period
RE: Tank Settlement after Moving
RE: Tank Settlement after Moving
Now if you need to do the whole foundation then yes it is expensive.
RE: Tank Settlement after Moving