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Iron Pump

S-Type Ejector

Ejector / Eductor · Pumps

Technical data from manufacturer or class sources · not yet verified by a person​‍‌​​‍​‍‍​‍⁠⁠​​‌‌‍‌‍

IRON Pump A/S S-Type Ejector — Precision non-moving-part ejector for ballast stripping and condensate removal.

Inspection

Inspector Detail

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 cleaningregularly, per company PMS - frequency depends on water quality
Nozzle/venturi wear inspectionat dry-dock or major overhaul
Gasket renewalas needed when joints are opened, or on any sign of leakage

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Typical wear limits

Nozzle/venturi throat dimensionmanufacturer-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.

Estimated lifetime: This design has no moving parts, so a fixed running-hour figure is not meaningful; wear is driven by erosion and cavitation rather than duty cycle, and replacement of the nozzle/venturi is normally condition-based rather than time-based

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