Failure of a Low-Carbon Steel Pressure Vessel From Caustic Embrittlement by Potassium Hydroxide
A large pressure vessel that had been in service as a hydrogen sulfide (H2S) absorber developed cracks and began leaking at a nozzle. The vessel contained a 20% aqueous solution of potassium hydroxide (KOH), potassium carbonate (K2CO3), and arsenic. The vessel wall was manufactured of ASTM A516, grade 70, low-carbon steel plate. A steel angle had been formed into a ring was continuously welded to the inside wall of the vessel. The groove formed by the junction of the lower tray-support weld and the top part of the weld around the nozzle was found to have a crack. Pits...
Failure of a Low-Carbon Steel Pressure Vessel From Caustic Embrittlement by Potassium Hydroxide, ASM Failure Analysis Case Histories: Design Flaws, ASM International, 2019, https://doi.org/10.31399/asm.fach.design.c0048819
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