Page 237 - Rollingbearings

Overall conclusions
Sealing, mounting and

dismounting

Sealing

The current pump design uses radial shaft seals to keep the oil bath
lubricant in the pump and to protect the bearings from contamina-
tion (ig. 1, page 228). You can use seals SKF HMS5 (ig. 2) or
HMSA10 (ig. 3). These are suitable for both oil and grease lubricated
applications. The temperature range and speed capability of the
nitrile rubber compound used for these seals suits the operating
conditions of the pump.
When the seal counterface becomes worn, you can repair the
shaft with a wear sleeve, such as SKF Speedi-Sleeve.

Hot mounting of the bearings

The bearings are mounted with an interference it on the shaft and a
transition it in their housings. You can mount the bearings easily by
heating their inner rings to 100 °C (210 °F) and the housing seats to
50 °C (160 °F). For heating the inner rings, use an SKF induction
heater or electric hot plate.

Shaft alignment

To maximize pump life, the pump and its electric motor need to be
well aligned. SKF alignment tools can help.

Overall conclusions

The existing bearings can be used in combination with the new
impeller design.
Downsizing of the cylindrical roller bearing is recommended.

C.3 Centrifugal pump

235