We have a sundyne pump at Crude Distillation Unit. The pump was opened due to seal leakage issues. Internal Inspection revealed damage to impeller and Inducer.
Following are the process conditions
Serive : Stripped Water
pH : 10.5 to 11.0 on average
Rated Flow: 37 m3/h
Suction Presssure : ~ 0.5 kg/cm2.G
Discharge Pressure : 31 kg/cm2
Flow variation: 15 ~ 38 m3/h
Normal Flow : 32 m3/h
Design Minimum Flow : 7.2 m3/h
Stripped Water Temp : 65 ~ 70 C ( Temperature remained 80 ~ 85 C for 4 to 5 months as well)
Material of Impeller : ss316L
Pictures are attached for reference.
Can any one help me sort our the root cause of the problem and remedial actions:
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