CA6NM Pump Case Weld Repair

[BurningFuel]

I have a issue with a CA6NM slurry case, With a complete pmi the results show 300 s.s., Inco 82 and other unknown materials in the wetted areas, The case has boron coating, Wet mag shows well the major cracks are visible but there are small spider web cracks and with grinding go over 1/2" deep case is 1" and better thick, My problem is how to repair these cracks with 410NIMO, Stress relieve, and fully boron coat the wetted areas at 1900*, It was steam cleaned at 185* and we heard two very clear sharp TINGS! Is the case worth saving going in and butchering out the volute, removing entire reg. fits, gasket faces, installing new CA6NM split waters, welding in new reg. fits using 410NIMO? And another question should the back side of the cutwaters be perfect how much work really needs to go into them rough grind, smooth grounded surface does it matter?

 

[nfinit]

Cracks are not uncommon in the boron coating. There are enough concerns in your statement that, if possible, I would replace the case. Too many unknowns.