Defective oil content meter and pressure to discharge bilge water
At 2130, in the Mediterranean Sea 30 nm from land, the chief engineer instructs you to discharge the machinery space bilge holding tank. The oily water separator is running, but its 15 ppm oil content meter has been defective for three days and the alarm is isolated; the chief says to use the manual bypass and record the discharge as compliant in the Oil Record Book. The holding tank contains about 12 m³ of bilge water with a visible oil sheen. The ship is making 14 knots. There is a spare oil content meter cell on board but no calibration certificate; the nearest port is 18 hours away. You are the third engineer on watch.
1. How do you respond to the chief engineer, and what immediate actions do you take?
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I would decline to make the discharge and say why clearly: the OWS is not operating as required because the 15 ppm monitor is defective and the alarm is isolated. With a visible sheen in the tank and no functioning monitor, there is no evidence the discharge is at or below 15 ppm. Operating the manual bypass and recording it as compliant would be a falsification of the Oil Record Book and a MARPOL Annex I violation.
Immediate actions:
- Stop the OWS and keep the bilge water in the holding tank.
- Do not make any ORB entry that describes a compliant discharge.
- Inform the chief engineer that I will not operate the bypass, and ask for the defect to be repaired.
- Offer practical alternatives: retain the bilge water on board, transfer to the sludge tank if capacity allows, fit the spare meter cell and test it, or retain for shore reception at the next port.
- Inform the master if the instruction is repeated, and raise a defect/non-conformity in the SMS.
Reasoning: the law requires functioning monitoring and alarm equipment; a manual bypass defeats the automatic stopping device and removes the only evidence of compliance.
2. Set out the MARPOL requirements that apply and the records that must be kept.
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MARPOL Annex I requires ships of 400 GT and above to have approved oily water separating equipment and a 15 ppm oil content meter with an alarm and automatic stopping device. Discharge of machinery space bilge water is permitted only when the ship is proceeding en route, the oil content is 15 ppm or less, and the required equipment is in operation. In a special area such as the Mediterranean the rules are stricter, and in any case a defective monitor cannot support a compliant discharge.
Records:
- Oil Record Book Part I: entries for ballasting/bilge operations, OWS operation, retention, transfer to sludge or shore reception. Entries must be true, signed and retained for three years.
- Engine log: OWS running hours, defect details, times.
- Defect report and SMS non-conformity for the monitor and isolated alarm.
- If the water is retained, record the retention and tank soundings.
No entry should state a discharge that did not occur or a 15 ppm result that was not measured. The ORB is a legal record and is routinely inspected by port State control.
3. What if the chief engineer insists? Explain your escalation and the likely consequences of complying.
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If the instruction is repeated, I would ask for it in writing, repeat my objection in the SMS/company reporting system, and inform the master. The master has authority on board, but no one can lawfully order a false ORB entry or an illegal discharge. If the master supports the instruction, I would use the company’s confidential reporting channel or contact the DPA, and if necessary report to the flag State or the next port State authority. I would also make a factual note of the dates, times and instructions in my own record.
Consequences of complying:
- Criminal and administrative liability for the ship and individuals, including fines and possible detention.
- Port State control deficiency, expanded inspection and possible refusal of access.
- Certificate action against the engineer’s CoC and damage to the company’s reputation.
- Environmental harm from oil discharge, especially in a special area.
Reasoning: the professional duty is to the law and the environment, not to an unlawful instruction. Documenting the objection protects the engineer and the ship, and escalation is the correct response when a safety-critical system is deliberately defeated.