Tuesday, July 7, 2009

[MW:2636] STress relieving of TANK

Dear Friends,
 
We are executing one Sulphur recovery unit where it is specified to have full stress releiving of tanks.
 
Dia. of Tank is 22.5 m. Plate MOC is SA 516 Gr. 60 + Nace + HIC.
 
Concerned Issues are:
 
1. As this tank is required SR for the service, The foundations are not designed to withstand at 620 Deg.C .So do normally it is done at foundation itself with providing insulation pads in between tank bottom and foundation.
 
2. Or the tank can be fabricated on the fabricated structure on the foundation and after SR it can be lifted to remove the fabricated structure.
 
It would be helpful if some body have experience in this type of tank construction methodolgy and also can you please provide the company used to carry out the TANK SR at situ in india.
 
Appreciate your urgent response.
 
Regards
Mukesh Kumar

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