Definition - What does Shaft Sleeve mean?
A shaft sleeve is a cylindrical shaped hollow metal tube that is mounted over a shaft and provides protection during the packing of the shaft assembly. Shaft sleeves are commonly found in single stage pumps. The pump shaft usually offers protection from corrosion and erosion.
Corrosionpedia explains Shaft Sleeve
The basic function of a shaft sleeve is to protect the shaft from packing wear at the stuffing box. Shaft sleeves protect the running surface of the shaft seal from damage or abrasive wear. An insufficient shaft hardness may make a shaft sleeve indispensable because the appropriate surface hardness must be considered for the anticipated operating conditions.
When choosing a shaft sleeve it should be noted that the thermal expansion coefficient of the shaft and the shaft sleeve should be equal. With a correctly chosen shaft sleeve, the chemical resistance of a steel shaft can be improved to a level equal to stainless steel.
Understanding Corrosion in Pumps and How to Deal With It