It can be handled in three main ways:

First, increase the fastening torque value of the flange bolt this method is suitable for corrosion, scratches relatively slight flange sealing surface.
 

Second, the use of grinding ring for manual on-site grinding repair for sealing surface small area of local surfacing.
 

Third, offline repair for cracks or defects serious, must deal with the sealing surface, and online can not be repaired or meet the requirements, usually use this method.That is to remove the container, shipped to the factory, the first crack removal, repair welding, heat treatment, and then on the large numerical control device processing.Disassembly and transportation of containers requires large cranes and transportation equipment, which is expensive and long, causing great economic losses to petrochemical enterprises.