Boiler Lower Drum Damaged (Repair?)

[RR79]

Some tube leaking near to the drum caused damage to the drum shell (lower drum).

The boiler rate is 100ton/h @ 24bar (220462 lbs/hr @ 348psi).

The nominal drum thickness is 31.7mm (1 1/4") and the minimum thickness at the damaged area is around 6mm (1/4") !!

What should be the recomended repair? Welding according ASME PW-40.3, or replace part of the shell?

Attached photo of the damaged region.

Kind regards,
RR79

 

[stanweld]

Recommend NBIC Method 1.

 

[metengr]

Agree with stanweld. However, it looks to me that you have a substantial amount of external corrosion damage in this area from wet ash conditions. I would strongly suggest you clean this location and obtain thickness readings on the terminal tubes and the header. You may have more damage from wastage.

 

[RR79]

Thank you for your answers!
We used NBIC 1, and the boiler is operating fine since yesterday.

Regards,
RR79