Pipeline Integrity Maintenance Resolution System for High-viscous and Congealable Crude Oil

A pipeline integrity maintenance resolution system is established in the light of high-viscous and congealable crude oil. The system makes resolution analysis on the basis of risk assessment results, sets up compatible maintenance measures, and monitors the effect made during next risk assessment following the practice of maintaining policy. The viscous and congealable crude pipeline is divided into such four kinds of its failure pattern as perforation, rupture, congealing and equipment failure, and risk probability and consequence assessment model are built up applying structural reliability principle and rupture mechanics aiming at perforation, crack induced rupture and congealing. The data from pipeline internal inspection may be used for realizing quantitative risk assessment. Fuzzy influence chart technology, on failure patterns with strong fuzzy characters of tapping for oil stealing and rupture caused by outside forces, is applied in establishing semi-quantitative assessment model, and works up an acceptable risk standard as well. The study result is applied in field for the risk assessment of a domestic pipeline and a maintenance advice is given.