Many a times we find surface breaking defects in castings after machining at the valve manufacturer location.
These castings would have been radiographically tested(only critical area as per B16.34) and accepted with 3.2 certification.
What is the acceptance criteria for relevant indications...
Shell Mesc SPE77/302;2008 requires 100% RT/UT on pressure containing parts in IC-IV. Since UT is given as an option, valve manufacturers are proceeding with UT on SDSS castings to save time. Since we do not have a reference standard for UT on high alloy steel castings, can we allow manufacturers...
