TS1, TS2

Common issues

• Mechanical seal leakage, typically after 8,000-12,000 running hours.
• Impeller erosion due to cavitation, often linked to insufficient NPSH or prolonged low-flow operation.
• Shaft bearing wear, commonly observed after 15,000-20,000 operating hours.
• Coupling misalignment leading to excessive vibration and premature bearing/seal failure.
• Motor overheating or insulation breakdown due to continuous overload or poor ventilation.
• Clogging of suction strainer or impeller passages, reducing flow and efficiency.
• Excessive noise or vibration from the pump unit, indicating internal wear or imbalance.

Inspection checklist

• Check mechanical seal for any signs of leakage (drips, streaks) and ensure drain line is clear.
• Monitor bearing temperatures (manual touch or IR thermometer) and listen for unusual noises (grinding, squealing).
• Verify coupling alignment annually using feeler gauges or laser alignment tool; inspect coupling elements for wear.
• Perform quarterly vibration measurements on pump and motor bearings, comparing to baseline data.
• Inspect impeller for erosion, pitting, or foreign object damage during dry-docking or major overhaul.
• Confirm suction and discharge pressure gauge readings are within normal operating parameters.
• Check motor current draw against nameplate FLA and ensure cooling fins are clear of debris.
• Verify integrity of foundation bolts and general pump/motor mounting for looseness or corrosion.
• Inspect casing for external corrosion, cracks, or signs of previous repairs.

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Complete mechanical seal kit (stationary and rotating faces, springs, O-rings)
• Set of shaft bearings (typically two per pump, e.g., deep groove ball bearings)
• Impeller (if cavitation is a persistent issue or for critical applications)
• Coupling elements/inserts (e.g., rubber spiders, flexible discs)
• Full set of casing gaskets and O-rings
• Shaft sleeve (if applicable, often part of the seal area)

Safety

• Ensure proper Lock-Out/Tag-Out (LOTO) procedures are followed before any maintenance or inspection.
• Beware of rotating machinery; ensure all guards are in place during operation.
• High-pressure seawater leaks can cause injury or damage to electrical components; wear appropriate PPE.
• Electrical hazards from the motor and control panel; ensure proper grounding and insulation.
• Hot surfaces (motor casing, bearings) during operation; allow cooling before handling.

Class survey

Surveyors typically check for general operational integrity: pump starts and stops correctly, no excessive noise or vibration, no significant leakage from seals or flanges. They will verify discharge pressure and flow (if instrumentation is available). Foundation security and proper guarding of rotating parts are also inspected. Maintenance records, particularly for critical components like seals and bearings, and the availability of essential spare parts (e.g., mechanical seal kit) are usually reviewed. Emergency stop functionality, if integrated, may also be tested. Overall cleanliness and condition of the pump and its surrounding area are noted.

Estimated lifetime: 40,000-60,000 hours before major overhaul (full strip-down, shaft inspection, casing refurbishment), with total service life often exceeding 100,000 hours with proper maintenance and component replacement.