CSP-250

Monitor bearing temperature continuously using thermometers or thermal sensors. Listen for abnormal rumbling or grinding sounds indicating bearing wear. Check bearing lubrication level and quality. Feel all bearing housings for excessive heat. Replace bearings if temperature exceeds design limits or audible wear is detected.

Observe the cartridge mechanical seal interface for visible leakage at casing joints. Monitor gland drip rates (should be steady drip, not continuous flow). Check for water or discoloration in seal lubricating oil. Replace seals before catastrophic failure occurs. Inspect seal faces for pitting or wear marks during overhaul.

Listen for characteristic cavitation noise (sounds like gravel passing through the pump). Monitor suction pressure to prevent starvation. Verify suction line is clear of restrictions. Check impeller for erosion pitting or material loss. Inspect casing interior for erosion patterns. Ensure AVSS (Automatic Vacuum Stripping System) functions properly for cargo pumps. Verify pump operates at designed suction pressure range.

During overhaul, inspect impeller blades for erosion, pitting, or material loss. Check internal volute surfaces for corrosion deposits or erosion marks. Measure wear ring clearance using feeler gauges and compare against specifications. Verify Ni-Al bronze material integrity (no cracks or spalling). Replace impeller if clearance excessive or damage evident. Monitor discharge pressure for performance degradation indicating internal erosion.

Record baseline vibration levels and monitor continuously if sensors fitted. Check for unusual vibration frequencies or amplitude increases. Verify motor-pump shaft alignment using dial indicators (typically ±0.05mm tolerance). Inspect intermediate shafts through bulkhead stuffing boxes for runout. Document vibration trends to predict bearing failure. Check coupling condition for wear or damage.