Installation issues of mechanical seals
Thread Content
The company is undergoing maintenance; yesterday a solvent oil pump was disassembled, and a new mechanical seal was required – a spring-type mechanical seal. The new seal is 2 millimeters taller than the old one, and after installation the pump would not rotate, as the shaft sleeve was too tight. (1) Can the pump rotate if the shaft sleeve is installed tightly? (2) If an additional gasket is installed at the static ring gland, will the compression amount of the mechanical seal change? (3) When installing the mechanical seal, the pump will not rotate – what aspects should be considered? Thank you so much, expert.
Adding a pad at the gland or inside the shaft sleeve can both reduce the amount of compression
1. The new mechanical seal performs better than the old one, as the spring in the old seal deforms after use. 2. A tight shaft sleeve does not affect the rotation of the shaft. 3. Adding additional shims to the static ring gland will change the compression amount of the mechanical seal. 4. Interference in the movement of the bearings and rotating components causes the mechanical seal to be compressed to its limit
It might be caused by excessive compression; the compression amount of the mechanical seal can be adjusted by modifying the stationary and rotating rings! Are you sure the bearings and impeller are in good condition?
To ensure the long-term use of the mechanical seal, it is recommended to pay attention to the following points during installation: 1. Ensure the smoothness of the shaft surface where it connects to the mechanical seal, so as to prevent leakage； 2. Ensure that there are no leaks at the connection between the seal and the pump body ； 3. The overall structure should not require any additional modifications; it must remain in its original state. What cannot be fixed should not be attempted to be repaired; what cannot be repaired must have a replacement part installed ； 4. The replaced parts must meet the original specifications and models. (For reference)
Move. The installation of the stationary ring does not meet the requirements; inclination increases the compression amount, which can easily lead to damage or cracking of both the stationary and moving rings.
Pump model: 32AY60X2
Thank you, expert! I have another question: the pump model is 32AY60X2. This pump uses a mechanical seal with large springs – is it possible to replace it with a mechanical seal that uses bellows? Is it universal? What aspects need to be considered when replacing it?
I’m not very familiar with equipment, but in our factory, after the seal of a liquefied gas pump started leaking, we replaced it several times – yet those seals were not from the original manufacturer. As a result, the white oil couldn’t circulate properly. Things improved immediately once we used a seal from the original manufacturer!
The tightness of the shaft sleeve has no connection with the inability to turn the disk. The static ring gland and gaskets reduce the amount of compression. If only the seal is replaced and nothing else is changed. If the turntable does not move, check the seal assembly as well as bearing alignment issues