PSC deficiency code 14104: Oil filtering equipment

Area 14 Pollution prevention (MARPOL)

This code covers the equipment that lets a ship discharge treated bilge water at sea: the oily water separator (OWS), the 15 ppm bilge alarm and the valve that stops or recirculates the flow when the alarm trips. Inspectors want to see it work, and they want to see that the crew can run it.

What the inspector looks at

Expect a request to start the system, often with bilge water rather than sea water.

  • The OWS starts and runs, and the crew can explain the line-up
  • The 15 ppm monitor reads, alarms and operates the stopping or three-way valve when tested
  • Calibration of the bilge alarm is in date per the maker's documentation
  • No bypass: overboard piping, flanges and blanks are as shown in the drawings, without temporary hoses or connections
  • The fresh water flushing line to the sensor can't be used to dilute the sample during discharge
  • The equipment matches the type-approval certificate and the IOPP supplement

Common findings

  • Oily water separator not operational
  • 15 ppm bilge alarm not working, no alarm when tested
  • Three-way valve does not recirculate on alarm
  • Bilge alarm calibration certificate expired
  • Crew not familiar with operation of OWS
  • Flexible hose connection found on OWS overboard line
  • Sample line to monitor blocked

The rule behind it

MARPOL Annex I, regulation 14, requires oil filtering equipment that keeps the oil content of the discharge at or below 15 ppm, and for larger ships an alarm with automatic stopping. Equipment fitted on newer ships has to meet IMO resolution MEPC.107(49), which also sets requirements for the alarm to record its status. Operations are recorded in the Oil Record Book.

Action codes you are likely to see

Small defects such as a blocked sample line, cleared while the inspector is on board, get 10. A system that works but has an expired calibration often gets 16 or 17. When the OWS can't be demonstrated, the alarm doesn't stop discharge, or there's evidence of a bypass, it may be treated as a ground for detention (30), and an inspector may expand the inspection into MARPOL operations generally. See action taken codes.

How to close it

Repair the separator and alarm, with a service report from the maker or an authorised service company where parts or calibration are involved. Renew the calibration certificate, remove any unauthorised connections and seal flanges where the company's procedures call for it. Demonstrate the system to the inspector or the RO and record the test. Retrain the engine crew and log it. Keep the service report, calibration certificate and test record with the Form B.

Questions

Is a broken oily water separator a detainable deficiency?

It often is. Without working filtering equipment the ship can't legally discharge bilge water at sea, and inspectors treat this as a serious MARPOL defect, especially if the crew can't show how bilge water has been handled.

Can the ship sail with the OWS out of order?

Only with the inspector's agreement and a plan, typically keeping all bilge water on board and landing it ashore until the repair, with the flag or RO involved where needed. Record every operation in the Oil Record Book.

Who can calibrate the 15 ppm bilge alarm?

The maker or a service company authorised by the maker, normally by replacing or recalibrating the measuring cell. Keep the certificate they issue on board.

Sources

Written by the SuperRonin team from the sources above. Last updated 27 Oct 2026. This page explains the rules; the regulation, the PSC officer and your flag and class have the final word. If something here doesn't match what you see on board, write to [email protected] and we'll correct it.

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Other codes in Pollution prevention (MARPOL)

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