ITT Goulds Pumps V 3298, Installation, Operation And Maintenance Instructions

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3298 Family Rev. 4/07
37
Fig. 33
Table 7A
Failure Symptoms Due to Dry Run Operation
Poor lubrication or dry run operation of 3298 liquid lubricated bearing surfaces results in a significant increase of heat generation. The
lack of cooling flow through the pump also causes significant temperature increase of the bearings. This temperature increase causes
damage to the surrounding parts as described and shown in Fig. 33: (Numbers in Fig. 33 correspond to numbers described below).
1. The plastic surrounding the outboard thrust bearing may be melted.
2. The plastic surrounding the carbon or silicon carbide impeller radial bearings may be melted.
3. The plastic surrounding the inboard thrust bearings may be melted.
4. If the impeller seizes on the shaft due to excessive heat, the shaft may spin in the shaft spider, wearing the inside diameter of
the shaft spider.
REMEDY
A. Install dry run protection device like a power monitor (refer to appendix for more information on power monitors)
B. Modify process system or controls to eliminate dry run operation.
C. Change bearing material to DryGuard™ coated silicon carbide if silicon carbide bearings were initially installed in the pump.