From the photos of the machanical seal damage, there are obvious deep scratches on the dynamic torus fracture and sealing performance. The reason is that the friction of the static and dynamic ring of the mechanical seal is too large in the process of starting the pump, and the starting torque is too large, resulting in the impact on the dynamic torus of the machine seal, resulting in fragmentation. The excessive friction of the sealing surface is due to the poor surface seal.
Before starting the pump, the seal cavity is not fully emptied, and the seal has poor lubrication and large dry wear resistance.
The pump stops for too long at the site, there is no manual turning for the first start, there is no manual separation of the dynamic and static torus of the sealing faces, and direct starting will cause instantaneous torque to be too large for the sealing surface.