Abrasive blast of surface after PWHT
Abrasive blast of surface after PWHT
(OP)
I was wondering if anyone has an idea whether abrasive blasting may not be suitable before PWHT. I know almost everyone blasts surfaces for painting after PWHT and after hydrotest to avoid corrosion problems. However, would blasting negatively influence material properties (i.e. would be equivalent to hammering or peening the surface and welds) which may lead to hardening of the surface? I am specially worried about blasting of internal surface in preparation for internal coating. I have a vessel that needs PWHT and internal coating at the same time. Your help is most appreciated in this matter.
Cheers,
Yaser
Cheers,
Yaser





RE: Abrasive blast of surface after PWHT
rmw
RE: Abrasive blast of surface after PWHT
No.
RE: Abrasive blast of surface after PWHT
Shot peening is not intended for cleaning. This methos uses an entirely different media to cold work the surface with some penetration into the substrate.
RE: Abrasive blast of surface after PWHT
then you will need blast again.