S-Type Ejector
IRON Pump A/S S-Type Ejector — Precision non-moving-part ejector for ballast stripping and condensate removal.
Inspector Detail
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Common issues
- Nozzle or venturi throat erosion reducing suction performance over time
- Motive water strainer clogging, starving the ejector of its driving flow
- Loss of suction from air leaks at flange or pipe joints
- Reduced performance when motive supply pressure falls below the design point
- Non-return valve on the discharge side sticking or failing, allowing back-flow
Inspection checklist
- Check motive supply pressure against the design specification
- Check suction and discharge lines for blockage or restriction
- Visual check of the nozzle and diffuser/venturi for erosion at overhaul
- Check flange and joint gaskets for leaks or air ingress
- Verify non-return valve function on the discharge side
- Check strainer condition on the motive supply
Service intervals
| Motive supply strainer cleaning | regularly, per company PMS - frequency depends on water quality |
| Nozzle/venturi wear inspection | at dry-dock or major overhaul |
| Gasket renewal | as needed when joints are opened, or on any sign of leakage |
Typical wear limits
| Nozzle/venturi throat dimension | manufacturer-specific and not something a generic figure can be given for; as a rule of thumb, erosion beyond a few tenths of a millimetre from as-new typically shows up as a noticeable drop in suction performance - confirm the actual figure against the maker's drawing |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Nozzle
- Diffuser/venturi insert
- Gasket set for flanged joints
- Non-return valve
Safety
- Motive fluid can be under significant pressure - isolate the supply before any maintenance
- Ballast, bilge or condensate being handled may be contaminated - use appropriate PPE for oily or dirty water
- Confirm the system is fully depressurized before opening any joint
Class survey
Note on this entry: the order data listed this item's type as 'Freshwater Hydrophore Pump', but the description (S-Type Ejector, precision non-moving-part ejector for ballast stripping and condensate removal) is an ejector, not a pressure-boosting hydrophore pump. This entry has been written for the ejector. Ballast stripping ejectors are typically checked as part of the ballast system function test at survey; bilge ejectors fall under the bilge/oily water system survey.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Inspect bearing noise, vibration levels, and oil/grease condition; monitor temperature; check seal integrity around bearings
Check for leakage at all pipe connection flanges; verify no moisture seepage; confirm gasket condition and bolt torque specifications
Listen for cavitation noise; measure vibration signatures; inspect internal surfaces for erosion/corrosion; verify NPSH margins
Examine mechanical seal faces for wear/scoring; verify seal flush plan function; check seal chamber oil level (for mechanical seals)
Verify coupling gap and parallel alignment with dial indicator; inspect for cracks, wear, or elastomer degradation
Type-general inspection and maintenance points for this equipment category — not model-specific.
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