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97517 BURST TEST OF A VESSEL UNDER WET SOUR GAS CONDITIONS

Picture for 97517 BURST TEST OF A VESSEL UNDER WET SOUR
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Product Number: 51300-97517-SG
ISBN: 97517 1997 CP
Author: Karol E. Szklarz, John Bowker, Russ Orr
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A sour burst test of a pressure vessel is described and the results given. The vessel was inspected for existing defects, rnaterial properties tested, integrity analyzed and artificial defects introduced before the vessel was subjected to a worst-case environment causing hydrogen charging. The vessel had existing hydrogen-induced cracking (HIC) and some vertical weld defects. Laboratory materials testing in the hydrogen-charging environment showed the vessel was susceptible to HIC damage, showed no yield strength reduction, reduced plastic ductility in rising load but exhibited a brittleness under high plastic strain. No existing or artificial defect initiated the final burst. Sulfide stress cracking (SSC) initiated at a weld produced with temper-bead capping passes but no post weld heat treatment. The vessel survived to 1.2 times actual yield or more than four times its license pressure but the vessel did exhibit a decrease in plastic ductility. Monitoring during the burst test showed that the vessel had been significantly charged with hydrogen. Keywords: wet sour gas, sulfide stress cracking, hydrogen-induced cracking, burst test
A sour burst test of a pressure vessel is described and the results given. The vessel was inspected for existing defects, rnaterial properties tested, integrity analyzed and artificial defects introduced before the vessel was subjected to a worst-case environment causing hydrogen charging. The vessel had existing hydrogen-induced cracking (HIC) and some vertical weld defects. Laboratory materials testing in the hydrogen-charging environment showed the vessel was susceptible to HIC damage, showed no yield strength reduction, reduced plastic ductility in rising load but exhibited a brittleness under high plastic strain. No existing or artificial defect initiated the final burst. Sulfide stress cracking (SSC) initiated at a weld produced with temper-bead capping passes but no post weld heat treatment. The vessel survived to 1.2 times actual yield or more than four times its license pressure but the vessel did exhibit a decrease in plastic ductility. Monitoring during the burst test showed that the vessel had been significantly charged with hydrogen. Keywords: wet sour gas, sulfide stress cracking, hydrogen-induced cracking, burst test
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