The "2019 (5th) National High-end Seminar on Maintenance and Overhaul of Petrochemical Enterprises" was grandly held in Ningbo, Zhejiang Province on October 23rd, 2019. Focusing on the theme of "improving the innovation ability of operation and maintenance technology and ensuring the safe operation cycle of the equipment", the technical backbone of HTS published an academic exchange report on "HTS Five-section Flange Management" at the meeting, and exchanged with the participants the safety, stability and long-term operation of the production equipment in petrochemical enterprises, and how to achieve the five goals of safety, quality improvement, cost reduction, efficiency improvement and environmental protection, so as to ensure that the construction process is safe and controllable and the construction records are well documented Nearly 400 relevant experts from domestic government agencies, petrochemical production enterprises, Jian 'an Company, maintenance and technical services, etc. listened to the speeches of the meeting. The successful convening of the seminar will also open a new chapter for the inspection and maintenance of petrochemical equipment in the future.