What are the requirements for installing mechanical seals in multi-stage centrifugal pumps?

What are the requirements for the installation of mechanical seals in multi-stage centrifugal pumps?
1. The radial runout of the shaft sleeve or shaft at the installation of the mechanical seal should comply with the corresponding regulations, with a surface roughness of 3.2 and a radial deviation not exceeding h6
2. The radial displacement of the shaft shall not exceed ± 0.5mm.
3. The sealing end face and surface roughness of the contact between the dynamic and static rings should meet the requirements. Be careful during disassembly and assembly to avoid collision and damage to the sealing surface; It is strictly prohibited to strike with a hammer or iron tool.
4. During installation, the installation site and mechanical seal must be cleaned thoroughly to prevent any impurities from entering the sealing area. Apply turbine oil and spindle oil to the sealing surface during assembly.
5. The compression amount of the spring must be adjusted appropriately so that the compressed length of the spring is its working length.