Question 1

A crew member slipped on the poop deck during a mooring operation but was not injured. As Chief Mate, how do you manage this near-miss under the ISM Code?

Accepted Answer

NEAR-MISS INVESTIGATION — CHIEF MATE's ISM OBLIGATIONS: WHY NEAR-MISSES ARE CRITICAL: the Heinrich Triangle (accident causation model) suggests that for every fatal accident, there are approximately 30 serious injuries, 300 minor injuries, and 3,000 near-misses. Near-misses are the leading indicator of future accidents. ISM Code Section 9 requires: "The Company shall establish procedures for the reporting and investigation of non-conformities, accidents and hazardous situations." A near-miss (slip without injury) is a "hazardous situation" that must be reported. IMMEDIATE POST-INCIDENT ACTIONS: (1) SECURE THE SCENE: identify the slipping hazard. Was there oil on the deck? Was the grating slippery? Was the correct footwear being worn?; (2) DOCUMENT: photograph the scene before it is cleaned. Photograph footwear. Note weather conditions (wet deck, rain); (3) INTERVIEW WITNESSES: the crew member who slipped and any witnesses. Take factual statements promptly — memory degrades quickly; INVESTIGATION PROCESS: (4) ROOT CAUSE ANALYSIS: why did the slip occur? (a) Environmental factor: wet deck, oil spillage, worn non-slip coating?; (b) Human factor: crew member not wearing non-slip boots, running, distracted?; (c) Systems factor: was there a safe working procedure for this operation? Was it followed?; (5) CORRECTIVE ACTIONS: address the root cause: repair/replace anti-slip coating, retrain crew on PPE, update the mooring procedure risk assessment; (6) REPORT TO SMS: file the near-miss report in the SMS. The DPA should be informed. SMS reports are reviewed in the Safety Committee meeting; (7) TOOLBOX TALK: brief the crew on the near-miss and corrective actions taken. ISM Code Section 9 — near-miss reporting is mandatory: ISM Section 9.1 requires the company to "establish procedures for reporting and analysing accidents and hazardous situations." A near-miss is a "hazardous situation" within the meaning of Section 9. This is a mandatory ISM requirement — not voluntary. The SMS non-conformity/near-miss reporting system must capture this event. MAIB reporting threshold: the MAIB Regulations 2012 require reporting of "accidents" — defined as events involving death, serious injury, significant vessel damage, or significant pollution. A near-miss without injury does not meet the mandatory MAIB reporting threshold. Some safety-conscious companies voluntarily share near-miss information with MAIB's voluntary reporting scheme (MARS) — but this is not mandatory. ISM Safety Committee and DPA review: near-miss reports flow through the SMS to the DPA and are reviewed at the vessel's Safety Committee meeting. This systematic review identifies patterns — for example, multiple slipping incidents in the same location suggest a structural deficiency. The DPA can allocate resources to address systemic issues identified through near-miss reporting. Liability waiver (option D): having the crew member sign a statement that they were not injured does not protect the company — it is not a legal waiver. If the crew member later develops symptoms from the incident (e.g., muscle strain that worsens over days) — the company's conduct in having them sign a "no injury" statement could actually be used against the company as evidence of attempting to cover up the incident. MLC 2006 protects seafarers from coercive practices in relation to health and injury.

Question 2

As Chief Mate on a chemical tanker, you are planning to load benzene (UN 1114, Class 3, PG I) after carrying methanol. What segregation, tank preparation, and safety measures apply?

Accepted Answer

BENZENE LOADING AFTER METHANOL — CHIEF MATE's PLANNING: CARGO COMPATIBILITY CHECK: (1) Are methanol and benzene compatible for sequence loading? Methanol (Class 3/6.1) and benzene (Class 3) are both flammable — BUT they are not compatible in the sense that residual methanol in a benzene cargo = CONTAMINATION. Check the IBC Code compatibility matrix and the charterer's cargo compatibility requirements; (2) TANK WASHING: tanks previously carrying methanol must be thoroughly washed before benzene loading. Methanol is water-soluble and miscible — water washing followed by recirculation is appropriate. Complete drying is required as water in benzene cargo = haze/contamination; (3) BENZENE PROPERTIES (UN 1114): (a) Class 3, Packing Group I (very high flammability); (b) Boiling point 80°C, flashpoint -11°C (extremely flammable); (c) TOXIC: a human carcinogen (Group 1 IARC). Vapour exposure risk — PPE: SCBA and full chemical protection suit for all operations; (d) Vapour density 2.7 (heavier than air — accumulates in low areas); (4) MARPOL ANNEX II: benzene is Annex II Category X substance (most hazardous). Pre-washing before any discharge — MANDATORY; (5) IBC CODE SPECIAL REQUIREMENTS: benzene requires closed loading, vapour return line (vapour recovery or destruction), enclosed gauging (no open ullaging), and restricted access during loading; (6) SAFETY ZONE: 3-metre exclusion zone around manifold during loading operations. No ignition sources within 30m. IGS may not be required (benzene is non-reactive to inert gas atmospheres) but nitrogen blanket may be required; (7) EMERGENCY: EmS F-E (flammable liquids fire) and S-E (spillage). Benzene as a carcinogen: benzene is classified as a Group 1 carcinogen by IARC (International Agency for Research on Cancer). The IMDG Code and IBC Code impose additional health protection requirements beyond standard Class 3 liquid handling. Exposure limits: the UK COSHH regulations specify a Workplace Exposure Limit (WEL) for benzene of 1 ppm (8-hour TWA). This is extremely low — the vapour pressure of benzene at ambient temperature means significant benzene vapour can be present at open ullage points, manifold areas, and any open sampling. ALL operations involving benzene cargo must use SCBA and appropriate chemical protection. IBC Code Chapter 15 special requirements: Chapter 15 of the IBC Code specifies additional cargo-specific requirements for each chemical. For benzene — these include: (a) vapour emission control; (b) closed operations; (c) emergency shutdown system; (d) health monitoring for crew. MARPOL Annex II Category X: benzene is among the most strictly regulated liquid cargoes under MARPOL Annex II. Discharge into the sea of any benzene-contaminated washwater is absolutely prohibited unless processed through a compliant retention/disposal system. Pre-wash is mandatory before ANY discharge of residues in any sea area. Cross-contamination (option B): loading benzene into a tank with methanol residue creates a contaminated benzene cargo. Methanol is infinitely miscible with benzene — even small traces will reduce benzene purity below specification. Additionally, water from tank washing that is not completely dried creates a benzene/water haze that similarly renders the cargo off-specification.

Question 3

In port, a cargo hold is opened and a strong smell of chlorine is detected. The manifest shows UN 1017 (Chlorine, Class 2.3 Toxic Gas) in the lower hold. Crew members are near the hold. As Chief Mate, what do you do?

Accepted Answer

CHLORINE GAS RELEASE — EMERGENCY RESPONSE: UN 1017, CHLORINE, CLASS 2.3: (a) Extremely toxic gas — IDLH (Immediately Dangerous to Life and Health) 10 ppm; (b) Heavier than air (vapour density 2.5) — accumulates at low levels in holds; (c) Bleach-like odour detectable at 0.5 ppm — if crew can smell it, concentrations may already be dangerous. IMMEDIATE ACTIONS — FIRST 60 SECONDS: (1) SHOUT AND CLEAR: warn all crew in the vicinity to MOVE AWAY UPWIND. Do not send crew into the hold without SCBA; (2) WIND AWARENESS: position crew UPWIND of the hold opening. Chlorine disperses downwind; (3) NO IGNITION SOURCES: chlorine in combination with hydrogen (from bilge gas) could explode — no smoking, no naked flames. However, chlorine itself is not flammable; (4) CALL THE MASTER: immediate notification; (5) SOUND GENERAL ALARM: if the release is significant or risk of spread to accommodation; (6) CLOSE THE HOLD: if it can be done safely from outside without entering — secure the hold to contain the release; (7) EMERGENCY SERVICES: contact port authority and emergency services (shore fire brigade with HazMat team); (8) IMDG EmS: EmS code for UN 1017 is F-C (non-flammable gas fire) and S-U (toxic gas spillage). S-U: keep people away from damaged area. Contact 24-hour emergency advice centre; (9) EMERGENCY CONTACT: the DG manifest must show a 24/7 emergency contact. Call them immediately; (10) DO NOT VENTILATE BY BLOWING AIR INTO HOLD: this could disperse chlorine gas to adjacent areas. Chlorine toxicology: chlorine is one of the most dangerous gases that can be encountered on a cargo vessel. WWI chlorine gas attacks used concentrations above 1,000 ppm — but even at 30 ppm, severe chest pain, vomiting and pulmonary oedema occur. At 430 ppm — death within 30 minutes. Critically: chlorine is HEAVIER than air — it accumulates at the lowest point (bottom of the hold). Crew near the open hatch may not immediately appreciate the concentration at lower levels in the hold. IMDG EmS S-U: the Spillage Schedule for toxic gases (S-U) specifies: "ELIMINATE all ignition sources. STOP leakage only if safe to do so. Move people from danger area upwind. Advise competent authority of potential hazard. Contact chemical experts." "Rag over the face" approach (option C): chlorine at dangerous concentrations is immediately incapacitating. A crew member who enters a hold with chlorine vapour above IDLH using a rag as protection will quickly become incapacitated. This would turn a dangerous goods incident into a rescue situation requiring entry into a toxic atmosphere — putting additional lives at risk. The USCG and MAIB have investigated several cargo incidents where rescue attempts without SCBA resulted in rescuers also becoming casualties. Ventilation with fans (option B): ventilating by blowing air INTO the hold could spread chlorine gas to adjacent spaces, including engine room intakes and accommodation. The correct approach is to CLOSE the hold and control the release, allowing emergency services with HazMat equipment to handle decontamination. Detection threshold vs danger threshold: the detection odour threshold for chlorine is 0.5 ppm. This is BELOW occupational exposure limits (1 ppm ceiling under COSHH). Detection does not mean safe — it means dangerous concentrations may be nearby.