AN32/250
Azcue AN32/250 — Sea water, fresh water, cooling water centrifugal pump.
Inspector Detail
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Common issues
- Mechanical seal wear/leakage from dry running, cavitation or abrasive particles in the cooling water
- Impeller wear ring clearance increasing over time, reducing pump head and flow
- Cavitation damage (pitting) on impeller vanes from insufficient NPSH available
- Bearing wear or overheating from misalignment or lubrication neglect
- Casing or impeller erosion-corrosion in sea water service, particularly on bronze/gunmetal components
- Coupling misalignment causing vibration and premature seal/bearing failure
- Strainer or sea chest fouling reducing suction pressure and causing cavitation
- Scale or marine growth buildup in the casing reducing flow
Inspection checklist
- Check mechanical seal for leakage (weep versus continuous drip) during running
- Measure discharge pressure/flow against the baseline curve to detect impeller wear
- Check for unusual noise or vibration indicative of cavitation or bearing wear
- Verify coupling alignment at scheduled intervals or after any pump/motor disturbance
- Inspect strainer/sea chest for fouling affecting suction condition
- Check bearing temperature and lubrication (grease/oil level and condition)
- Inspect impeller and wear rings at overhaul for cavitation pitting and clearance
- Check casing for erosion/corrosion, particularly around the volute tongue and impeller eye
- Verify motor insulation resistance and current draw against nameplate
- Confirm relief/non-return valves in the cooling system are functioning correctly
Service intervals
| Seal leakage and bearing condition check | each routine round, logged periodically |
| Coupling alignment check | every 12 months or after any disturbance to pump/motor mounting |
| Bearing lubrication/grease renewal | per the maker's schedule, typically every 2,000-4,000 running hours or every 6-12 months |
| Impeller/wear ring inspection at overhaul | typically every 2-4 years, or on a condition/performance-trend basis |
| Strainer/sea chest cleaning | per operational fouling rate, checked at every routine round |
Typical wear limits
| Impeller wear ring radial clearance | commonly renewed once clearance has roughly doubled from the as-new value (new clearance is often in the region of 0.3-0.8 mm depending on pump size) - confirm the specific figure against the pump's own manual |
| Mechanical seal face wear | judged by leakage rate and visual face condition rather than a measurable dimension - renew at the first sign of excessive or continuous leakage |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Mechanical seal (cartridge/kit matching the fitted shaft diameter)
- Impeller wear rings
- Bearing sets
- Gaskets/O-rings for casing joints
- Flexible coupling insert
Safety
- Hot surface/scald risk given the pump's rated service up to +120 degC - allow cooling and depressurize before opening
- Rotating shaft/coupling guard must be fitted before running
- Sea water system isolation valves must be confirmed shut before seal or casing work to avoid uncontrolled flooding
- Electrical isolation of the drive motor before maintenance
Class survey
Sea water and fresh water cooling pumps serving essential machinery are typically covered under the ship's continuous machinery survey; class review focuses on standby pump availability/changeover testing, spares holding and maintenance records rather than opening a specific pump at every survey unless performance has degraded.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visually inspect seal gland for water seepage or linear leakage; check seal cavity for abnormal temperature rise; listen for abnormal friction noise
Measure bearing housing temperature with temperature gun; check bearing oil for water contamination and discoloration; inspect for abnormal vibration or squealing
Disassemble pump and inspect impeller blades for cavitation pits on leading edge, erosion wear, rust, scaling, and cracks at blade base; listen for marbles-in-pump sound during operation
Examine pump casing interior for wear grooves, scale buildup, corrosion pitting, and material loss; verify material compatibility with fluid type
Inspect vane attachment points for cracks, separation, or missing material; check alignment and balance of rotating assembly
Type-general inspection and maintenance points for this equipment category — not model-specific.
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