id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cet-13058		cet-13058		6	.pdf	application/pdf	3262	127	33	Data required for the determination of the damage factor for hydrogen embrittlement Required data Specific information Comments Environmental severity Hydrogen partial pressure Determine the operating pressure and the pressure during start-up, shutdown, and upset conditions Temperature Determine the operating temperature, and the temperature during start-up, shutdown, and upset conditions Materials susceptibility Microstructure, composition, strength Determine what kind of alloy or steel was used to fabricate the component Welds Determine if post-weld heat treatments (PWHT) were performed Component’s history Time since the last inspection Use inspection history to determine the time since the last HE inspection Inspection effectiveness category Determine the effectiveness category for the inspection that has been performed on the component Number of inspections Determine the number of inspections in each effectiveness category that have been performed on the component On-line monitoring Hydrogen probes and/or process variable monitoring Determine the type of proactive monitoring methods employed The following procedure may be used to calculate the damage factor for HE: 167 • STEP 1 – Determine the environmental severity (i.e., the potential level of hydrogen uptake) based on hydrogen partial pressure and temperature, using Table 2 (San Marchi and Somerday, 2012). Hydrogen embrittlement (HE) is the main active degrading mechanism in equipment exposed to hydrogenated environments; if not appropriately accounted for, it can cause failures at unexpectedly low stress levels.	cache/cet-13058.pdf	txt/cet-13058.txt