Inspection program evaluates HF-alkylation carbon steel piping

Leomar Peñuela, José Chirinos Pdvsa Manufactura y Mercadeo Judibana, Venezuela In 1995, Petroleos de Venezuela SA (Pdvsa) implemented an inspection program in the hydrofluoric acid (HF) alkylation unit of its Amuay, Judibana Falcon, Venezuela, refinery. The program's purpose was to detect potential corrosion on carbon steel flanges and welds on critical lines. That year, two failures in the 20,000 b/d HF alkylation unit at the Amuay refinery caused a shutdown of the unit. The failures occurred in one flange and one weld in the depropanizer-charge carbon steel pipe, which contained propane, isobutane, and anhydrous hydrofluoric acid (HF). Examinatio...

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