MO
Azcue MO — Marine self-priming close-coupled multistage side channel pump for high-pressure, low-flow vapor extraction.
Inspector Detail
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Common issues
- Mechanical seal wear from dry-running or entrained gas/vapour service
- Impeller/side-channel clearance wear reducing head and flow performance over time
- Cavitation from insufficient NPSH available on high-suction-lift vapour extraction duty
- Bearing wear from misalignment or coupling imbalance
- Casing erosion from entrained solids or scale in the pumped medium
Inspection checklist
- Check achieved head/flow against the curve at the operating point
- Inspect the mechanical seal for leakage during running
- Check bearing temperature and vibration during running
- Inspect coupling alignment and condition
- Check NPSH available versus required for the duty, especially at high suction lift
- Inspect casing and impeller for erosion/wear at scheduled overhaul
Service intervals
| Mechanical seal inspection | annually or at first sign of leakage |
| Performance check (head/flow) | annually |
| Bearing lubrication/replacement | typically every 1-2 years depending on running hours |
| Coupling/alignment check | at overhaul or after any disturbance |
| Internal clearance check (impeller/casing) | condition-based, at major overhaul |
Critical spares
- Mechanical seal kit
- Impeller/side-channel wear rings
- Shaft bearings
- Coupling element
- Casing gasket/O-ring set
Safety
- Confirm the pumped medium's flammability classification before hot work or seal maintenance nearby if this pump serves a vapour extraction/recovery duty
- Elevated discharge pressure up to the pump's rated max head means a seal or casing failure can release pressurised, potentially flammable liquid or vapour
- Verify dry-running protection is functional given the pump's low-flow/vapour duty
Class survey
Where this pump serves a cargo vapour recovery or similar cargo-related duty, it falls under the vessel's cargo system survey requirements; function and performance testing, along with any associated gas detection interlocks, should be verified and documented at survey.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Inspect mechanical seal faces for wear patterns and verify cooling/barrier fluid levels (where applicable). Check for weeping at the seal chamber under operating pressure. Listen for seal-related noise (grinding, squealing) indicating imminent failure.
Monitor bearing temperature trends using infrared thermography. Check grease consistency and color (oxidation indicates overheating). Verify bearing preload and axial movement. Listen for abnormal noise (grinding, rumbling) indicating cage wear or spalling.
Measure clearance between impeller and casing wear rings using feeler gauges. Check for visible scoring or erosion patterns on impeller and casing surfaces. Monitor discharge pressure decline and capacity loss indicating internal bypass.
For VP (vacuum priming): verify ejector vacuum generation (typically 0.7-0.8 bar). For EP (electric priming): test motor operation and check priming pump discharge. Monitor initial prime time; exceeding 30-minute dry-run specification indicates air leak or priming pump degradation.
Check suction line pressure (NPSH available vs. required). Clean/inspect suction strainers for marine growth, scale, or debris accumulation. Listen for cavitation noise ('marbles in pump'). Inspect impeller for pitting or erosion patterns typical of cavitation damage.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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