Abdullah Alali
Saudi Aramco, KSA
Title: Utilizing thermal spray coating technology to avoid PWHT after retention of nominal wall thickness through weld build-up on DGA stripper column
Biography
Biography: Abdullah Alali
Abstract
The paper presents one an experience in utilizing thermal spray coating technology on top of weld build-up of CS pressure vessel eroded shell. The vessel is under lethal service and had severe erosion on some of its internal surface of the shell. According to ASME PCC-2 (Repair of Pressure Equipment and Piping), Article 2.11, PWHT is required after retention of nominal wall thickness through weld build-up. However, heat treatment of this vessel was infeasible due to stability analysis results that show instability of the column during heat treatment. Therefore, thermal spray coating was used as a substitute to PWHT.