Pump Shaft Sleeve
A shaft sleeve is a cylindrical hollow metal tube placed over the shaft to
protect as it passes through the packing. Pump shafts are often protect-
ed from erosion, corrosion, and wear at leakage joints, seal chambers,
internal bearings and in the waterways by renewable sleeves.
The most common shaft sleeve function is that of protecting the shaft
from packing wear at the stuffing box. A shaft sleeve used between two
multistage pump impellers in conjunction with the inter-stage bushing to
form an inter-stage leakage joint is called an inter-stage or distance sleeve.
These are used in single stage pumps. Impeller and sealing gland are not
directly mounted on shaft. A sleeve is fitted between the bore of the
impeller and OD of the shaft and keyed with the shaft i.e. impeller rotate
with the sleeve along with the shaft. The wearable part in this type of assembly is the sleeve, which is far less expensive than the shaft.
The function of the impeller sleeves is to protect the shaft from wear and coming in contact with the pumping fluid.
Pump shafts are usually protected from erosion, corrosion, and wear at seal chambers, leakage joints, internal bearings, and in the waterways by renewable sleeves.
The most common shaft sleeve function is that of protecting the shaft from wear at packing and mechanical seals. Shaft sleeves serving other functions are given specific names to indicate their purpose.
For example, a shaft sleeve used between two multistage pump impellers in conjunction with the interstage bushing to form an interstage leakage joint is called an interstage.