Oily-Water Separator Failure and a Proposal to Defeat the Alarm
Your 11-year-old handysize bulk carrier is five days out of a Brazilian ore port bound for Rotterdam. The second engineer reports that the oily-water separator cannot hold effluent below 15 ppm: the 15 ppm bilge alarm activates continuously, the coalescer element is contaminated and the spare on board is the wrong part number. The separator is a MEPC.107(49) type and the automatic stopping device is functional. The machinery-space bilge holding tank holds 8.6 m3 of a 12 m3 capacity; daily bilge generation is about 0.4 m3. The chief engineer proposes to run the bilge through the separator with the alarm sensor isolated - his argument being that the water is clean anyway - and to enter the discharges in Part I of the Oil Record Book as 'through 15 ppm equipment'. He points out that the master is under pressure from the company over the fuel budget and that a shore repair in Rotterdam will cause a delay. Rotterdam has a reception facility and is a regular port state control port.
1. Assess the chief engineer's proposal against MARPOL Annex I and state what you do.
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The proposal is unlawful and the answer is refusal, recorded in writing and reported.
MARPOL Annex I Regulation 15 permits discharge of machinery-space bilge water only when it has passed through 15 ppm equipment that is functioning, while the ship is proceeding en route, and the effluent is below 15 ppm. Regulation 14 requires the ship to be fitted with the 15 ppm bilge alarm and the automatic stopping device specified by MEPC.107(49). Isolating the alarm sensor disables the very device on which the equipment's approval and the ship's compliance depend - it converts a malfunction into a deliberate discharge of oil above 15 ppm. The claim that the water is 'clean anyway' is unverifiable without testing and is irrelevant: the limit is objective, not an opinion.
The Oil Record Book compounds it. Regulation 17 requires accurate entries for every operation, signed by the officer in charge and each page signed by the master. An entry reading 'through 15 ppm equipment' when the equipment was not functioning and the alarm was bypassed is a false entry, and in most jurisdictions a criminal offence for the person making it and for the master who signs the page. It is also the single most common basis for detention and prosecution of crews, and port state control examiners look for exactly this pattern - tank soundings that do not reconcile with the ORB, and the tell-tale 'magic pipework'.
My action: stop the operation immediately, ensure the alarm is restored and working, inform the master, and report the defect to the DPA under the ISM Code within the 24 hours the SMS requires.
2. What lawful options exist for handling the accumulated bilge water, and what are their constraints?
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Do the arithmetic first: 8.6 m3 now, 0.4 m3 per day for five days, gives about 10.6 m3 on arrival against 12 m3 of capacity. Retention is feasible if nothing else goes wrong, so the pressure is not as severe as the engineer suggests.
Options in order of preference:
- Retain on board and land ashore at Rotterdam through the reception facility. Pre-arrange with the agent, get the ORB entry and the receipt, and be ready to show the tank soundings and the defect report to the port state control officer.
- Repair at sea if a serviceable, correctly part-numbered element can be sourced - the manufacturer's element, because a substitute voids the type approval; test the 15 ppm alarm and the automatic stopping device afterwards and record the test.
- Reduce generation: fix leaks, keep condensate and wash water out of the bilge, use water-efficient routines, and if the level becomes critical seek company approval to use another suitable empty tank for retention - never the cargo hold bilge wells, never overboard.
- Shore repair in Rotterdam, with the defect reported to the flag Administration and class as the SMS requires; expect the port state control officer to examine the separator, the alarm, the automatic stopping device and the ORB.
Never discharge untreated or partly treated water, and never discharge on the basis that it looks clean. The SOPEP is not a mechanism for routine disposal of bilge water - it governs response to an actual pollution incident.
3. What records should be made, and what are the consequences of doing it the chief engineer's way?
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The honest record for this voyage is short and entirely lawful: an entry for any transfer or retention of bilge water in the tank, a remark noting the separator defect and the isolation of the equipment from service, the notification to the company, flag and class, and at Rotterdam the ORB discharge entry to the reception facility together with the receipt. No entry may describe a discharge that did not happen.
The consequences of the alternative are well documented and severe. Once the ORB does not reconcile with the tanks, or the alarm is found defeated, or non-approved pipework is located, the outcome is detention, a criminal prosecution of the master and the engineer responsible, fines for the company, and in several jurisdictions imprisonment. It ends careers and can attach liability to officers who merely signed the page. Under the ISM Code, failing to report a defective pollution-prevention item is itself a non-conformity, so silence is not a neutral option either.
The cost of the lawful route is a few hundred dollars to land 10 m3 of bilge water and the inconvenience of a shore repair. Set that against a MARPOL prosecution. As chief mate I would refuse, put the refusal and the reasoning in writing to the master, and ensure the DPA has the defect report the same day - a contemporaneous written record is what protects the officers who did the right thing.