UT of inservice welds
UT of inservice welds
(OP)
Hi members
The pressure vessel ( in service) nozzle welds are required to be tested by manual UT . The vessel is PAINTED. Can UT be performed over paint? The calibration is always done on an unpainted reference block. How is the compensation done for the error introduced due to the paint . Any info or reference will be appreciated
Sree60
The pressure vessel ( in service) nozzle welds are required to be tested by manual UT . The vessel is PAINTED. Can UT be performed over paint? The calibration is always done on an unpainted reference block. How is the compensation done for the error introduced due to the paint . Any info or reference will be appreciated
Sree60





RE: UT of inservice welds
RE: UT of inservice welds
1. close visual inspection of paint for adhesion to steel substrate
2. compression wave inspection of paint steel interface to ensure uniformity of the bond.
3. paint thickness inspection of coating for any large variations in coating thickness which could cause mode conversion variations and or attenuation losses.
4. check for transfer losses/gains when comparing your cal block to your inspection surface. Transfer losses can be high when testing from a painted surface
RE: UT of inservice welds