The AL -1154/4 pump requires a shaft seal.
Medium-ethylene glycol solution. Installed on the ice arena.
The supplied ones work for 1-2 years.
What this may be related to. The estimated ambient temperature is -10/-15, but it can be lower.
The phenomenon of working with discharge is possible, with a lack of glycol (Antifreeze A40).
At the same facility, pumps installed in a warm circuit (Antifreeze A40) have been operating for more than 20 years without complaints.
The reason for the wear of the friction pairs in this case is due to the short-term operation of the pump on the "dry run".
Technical engineer, Inna Obernikhina