Spots in Valve casting Body
Spots in Valve casting Body
(OP)
Hello There,
We came across a different defect in a 52inch casted valve Body RF with spots after it came back from painting with all factory test completed. Picture attached. The material is of SA352 LCB.
Pleases share your experience and how you resolved, reason behind this if you came across similar issues?
Thanks in advance for your time and effort.

We came across a different defect in a 52inch casted valve Body RF with spots after it came back from painting with all factory test completed. Picture attached. The material is of SA352 LCB.
Pleases share your experience and how you resolved, reason behind this if you came across similar issues?
Thanks in advance for your time and effort.

RE: Spots in Valve casting Body
Not a metallurgist, but I think this is a classic shrinkage related porosity. Have seen several of it.
Since it is already pass the test, in theory there shouldn't be any issue. meaning that the raised face roughness and effective sealing area are still within tolerance.
However if your inspector suspect that there might be other issue and let say there is a doubt that porosity also occurs on other part of the body, then you might want to issue an NCR. It is a bit tricky though.
Not sure how you addressed the PO and its governing standard, but usually Inspection can go as far as ASME B16.34 Appendix I - Casting Radiographic Examination.
Personally, I have less concern on the raised face, but more on the 'thin' body part such as body neck, etc.
Hope that helps.
Regards,
D
RE: Spots in Valve casting Body