Per Section 5.5 of API 580:

“The mechanical integrity and functional performance of equipment depends on the suitability of the equipment to operate safely and reliably under the normal and abnormal (upset) operating conditions to which the equipment is exposed.”

Also, Section 9.4 confirms PoF depends heavily on: a) The damage mechanisms and deterioration rates under current operating conditions;

b) The ability of inspection to detect these issues before failure.

Thus, the equipment's suitability within its current and anticipated operating environment directly affects its PoF.