Session: OAC-01-01 Application in Risk Management and System Reliability

Paper Number: 107187

107187 - Application of Dynamic RBI and IOW Technology in Crude Distillation Unit 

Crude distillation unit generally exists severe corrosion. Risk-based inspection (RBI) technology can effectively assess risk of stationary equipment in petrochemical industry. Meanwhile, integrity operating window (IOW) can effectively control risk by establishing standard and critical limit. Current risk assessment of complete sets of equipment mainly adopted static method. API 584-2021describes the IOW parameters of the crude distillation unit, but there are few reports about how to apply the dynamic RBI and IOW in the field engineering to achieve real-time risk assessment and warning control of the safety operation boundary. Combining RBI and IOW technology, we recently developed a dynamic risk assessment and IOW warning system by interacting three types dynamic interface data, i.e., medium composition in laboratory information management system (LIMS), real-time process operation parameters in distributed control system (DCS) and equipment thickness in corrosion monitoring system (CMS). The developed system was further applied to the crude distillation unit. Three typical corrosion circuits including atmospheric tower top, vacuum tower bottom and gas recovery system were investigated in this paper. Firstly, the damage modes were analyzed according to API 571 and GB/T 30579. And then the monitoring points including medium compositions, process operation parameters and wall thickness were respectively established by analyzing the corresponding data in LIMS, DCS and CMS. Thus, the risk results will update dynamically with the variations of abovementioned data. Based on dynamic risk results, corrosion control document (CCD) as well as IOW operation boundary, such as contents of Cl^-, S and H₂S, acid value, medium flow velocity, of abovementioned circuits were proposed. This research will facilitate grasping the equipment risk state in real-time with dynamic RBI technology while ensuring the equipment steady operation by IOW warning technology.

Presenting Author: Juanbo Liu China Special Equipment Inspection and Research Institute

Presenting Author Biography: Juanbo Liu obtained his Ph.D degree with chemcial engineering from Chinese Academy of Sciences. Now, he works in China Special Equipment Inspection and Research Institute. He mainly focus on the field of risk intelligent assessment and control of pressure vessels.

Authors:

Juanbo Liu China Special Equipment Inspection and Research Institute
Jun Li China Special Equipment Inspection and Research Institute
Chang Liu China Special Equipment Inspection and Research Institute
Zhiyuan Han China Special Equipment Inspection and Research Institute
Guoshan Xie China Special Equipment Inspection and Research Institute
Libin Song China Special Equipment Inspection and Research Institute
Sheng Chen China Special Equipment Inspection and Research Institute
Haoyuan Kang China Special Equipment Inspection and Research Institute