Ejector V-Type
Iron Pump Ejector V-Type — Vertical application, no moving parts.
Inspector Detail
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Common issues
- Erosion of the motive nozzle and throat from cavitation if driving pressure exceeds design point
- Blockage of the suction or motive line by debris (no moving parts means it cannot clear itself)
- Loss of suction/lift performance from wear of the venturi profile over long service
- Flange gasket leakage from vibration or thermal cycling
- Corrosion or pitting of wetted parts, especially where dissimilar metals are in contact in seawater service
- Reduced motive fluid supply pressure from an upstream valve not fully open or a fouled strainer
Inspection checklist
- Motive (driving) fluid pressure checked against the design operating point
- Achieved suction/vacuum and discharge flow checked against expected performance
- Visual/borescope check of nozzle and throat for erosion or pitting
- Upstream strainer condition and cleanliness
- Flange bolting and gasket condition
- External corrosion of body and connections
- Audible check for cavitation noise at running conditions
Service intervals
| Internal nozzle/throat inspection | typically opened up at dry-docking, or sooner if performance drops |
| Upstream strainer cleaning | per operational routine, more often in dirty bilge/ballast duty |
| Flange gasket renewal | condition-based on leakage, not a fixed running-hour interval |
| External corrosion check | each planned maintenance round |
Typical wear limits
| Nozzle/throat erosion | no fixed dimensional limit for a no-moving-parts ejector - assess by visible erosion pattern and by measured loss of suction/flow performance against the original curve, not by running hours |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Motive nozzle
- Venturi/throat liner
- Flange gasket set
- Flange bolting (material matched to body to avoid galvanic corrosion)
- Body seal/O-ring set where fitted
Safety
- Pressurised motive fluid supply (steam or water) - burn/injection injury risk from any leak or joint failure
- Positive isolation and lock-out of the motive supply required before opening the unit for inspection
- Incorrect body material for the duty fluid can fail under pressure without warning signs
Class survey
Assessed as part of the bilge/ballast/stripping piping system survey - condition of body and valves, correct segregation of oily vs clean systems, and documented performance checks are what surveyors look for rather than the ejector itself in isolation.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection for weeping/visible leakage; pressure test if applicable; check mechanical seal condition for carbon face wear
Use vibration analysis equipment; listen for grinding or unusual noise; check bearing temperature; inspect bearing housings for cracks
Visual inspection of impeller blades for pitting, erosion, blade thinning; check for visible cracks; ultrasonic thickness measurement if critical
Performance curve comparison against baseline; check suction strainer for blockage; inspect impeller inlet area for cavitation pits
Dial indicator alignment check; visual inspection of elastomer for cracks/wear; check coupling bolts for proper torque
Type-general inspection and maintenance points for this equipment category — not model-specific.
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