Question 1

A crew member falls into the engine room from a ladder and sustains a suspected fractured femur (thigh bone) and possible internal injuries. As Chief Mate, how do you manage this?

Accepted Answer

FEMUR FRACTURE AND TRAUMA — MANAGEMENT: IMMEDIATE LIFE THREAT ASSESSMENT: femoral fractures can cause: (a) MASSIVE HAEMORRHAGE — the femur can bleed 1-1.5 litres into the thigh. This alone can cause haemorrhagic shock; (b) FAT EMBOLISM — fat from the marrow entering the bloodstream can cause respiratory failure. DO NOT MOVE the patient unnecessarily. ABCDE ASSESSMENT: (A) AIRWAY: is it open? Can the patient speak? (B) BREATHING: respiratory rate, any chest injury (fall from height — check for rib fractures, pneumothorax); (C) CIRCULATION: pulse rate and quality. Are they going into shock? (pale, cold, clammy, rapid weak pulse = shock); (D) DISABILITY (neurological): is the patient conscious? AVPU scale (Alert, Voice, Pain, Unconscious); (E) EXPOSURE: examine for ALL injuries — do not focus only on the obvious leg injury. A fall from height may cause multiple injuries. TREATMENT: (1) DO NOT MOVE without stabilising the fracture — use a traction splint (e.g., Sager splint if available) or improvised padding and bandage. Movement of an unstabilised femur fracture = extreme pain + risk of bone fragment damaging femoral artery; (2) INTRAVENOUS FLUIDS: if the patient is in shock and IV access is available (and personnel trained) — IV fluid resuscitation. Contact TMAS for guidance; (3) MORPHINE: for pain — TMAS guidance required. Morphine is appropriate here (after TMAS guidance) for fracture pain; (4) TMAS CONTACT: immediately. Describe mechanism of injury, symptoms, vital signs; (5) MEDEVAC: suspected femur fracture with shock in an engine room accident — TMAS will likely recommend medevac. Femoral artery risk: the femoral artery runs along the medial aspect of the thigh. A fractured femur with displaced bone fragments can lacerate the femoral artery — causing life-threatening haemorrhage. Moving a patient with an unstabilised femur fracture is contraindicated until the fracture has been splinted. This is covered in all first aid at sea courses (Elementary First Aid STCW A-VI/1) and the Ship Captain's Medical Guide. Hypovolaemic shock in femur fracture: haemorrhage of 1-1.5 litres (typical for closed femur fractures) represents 20-30% of blood volume in an average adult. Loss of 30% of blood volume causes haemorrhagic shock: (class III shock: rapid pulse, low blood pressure, pale/cold skin, confusion). Treatment priority is fluid resuscitation (IV access) and haemorrhage control (traction splint to reduce fracture site volume). MAIB investigation relevance: engine room falls (on ladders, from gratings) are among the most common fatal accident types in UK merchant shipping. MAIB investigates these regularly. Contributing factors include: inadequate handrail protection, slippery surfaces, inadequate PPE, poor lighting. The Chief Mate's role extends to the pre-incident safety culture — identifying and correcting these hazards before someone falls. Sitting the patient up (option B): sitting up a patient with suspected spinal injuries (from a fall) can cause catastrophic spinal cord injury. The first step with any fall victim is to stabilise the cervical spine and not move the patient until a spinal injury is excluded. Standing the patient (to "test" the fracture) is extremely dangerous.

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.