6.2 Occupational Health, Risk Assessment & PPE

6.2 Occupational Health, Risk Assessment & PPE

Core Occupational Principle: A ship is an industrial factory, a power generation plant, a hazardous materials warehouse, and a residential home—all floating on an unpredictable ocean. Preventing occupational injuries requires systematic risk assessment, strict adherence to the hierarchy of controls, disciplined Lockout/Tagout (LOTO) energy isolation, and the correct selection and maintenance of Personal Protective Equipment (PPE).

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1. The 5-Step Shipboard Risk Assessment Process

Risk management is the systematic evaluation of operational hazards before any maintenance, cargo operation, or seamanship task is executed. The maritime industry utilizes a standardized 5-Step Risk Assessment Process:

                      THE 5-STEP RISK ASSESSMENT FRAMEWORK
  ┌────────────────────────────────────────────────────────────────────────┐
  │ STEP 1: IDENTIFY THE HAZARDS                                           │
  │ • Walkdowns, Job Safety Analysis (JSA), inspection of work area.       │
  │ • Identify rotating machinery, heights, electricity, chemicals, heat. │
  ├────────────────────────────────────────────────────────────────────────┤
  │ STEP 2: IDENTIFY WHO COULD BE HARMED & HOW                             │
  │ • Deck ratings, engineers, galley staff, contractors, bridge watch.    │
  │ • Identify specific injury mechanisms (crushing, fall, inhalation).    │
  ├────────────────────────────────────────────────────────────────────────┤
  │ STEP 3: EVALUATE RISK & DETERMINE CONTROLS                             │
  │ • Calculate: Risk = Likelihood (Probability) × Severity (Consequence). │
  │ • Plot on Risk Matrix (Low, Medium, High, Unacceptable).               │
  ├────────────────────────────────────────────────────────────────────────┤
  │ STEP 4: RECORD FINDINGS & IMPLEMENT CONTROLS                           │
  │ • Apply Hierarchy of Controls (Elimination down to PPE).               │
  │ • Document in Toolbox Talk (TBT) / Permit to Work (PTW).              │
  ├────────────────────────────────────────────────────────────────────────┤
  │ STEP 5: REVIEW & MONITOR EFFECTIVENESS                                 │
  │ • Dynamic Risk Assessment: "Take 5 / Stop Work Authority" if changed.  │
  │ • Post-job debrief to capture lessons learned.                         │
  └────────────────────────────────────────────────────────────────────────┘

The Risk Matrix (Likelihood × Severity)

Risk is defined quantitatively as the mathematical product of the Likelihood of an occurrence and the Severity of its potential outcome:

$\text{Risk Score} = \text{Likelihood} \times \text{Severity}$

• Unacceptable / Extreme (9–16): Work must NOT proceed under any circumstances. Redesign task.
• High / Medium (4–8): Work may proceed only with formal controls, supervisor oversight, and signed PTW.
• Low / Negligible (1–3): Acceptable residual risk with standard operating procedures and basic PPE.

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2. The Hierarchy of Hazard Controls

When mitigating identified shipboard hazards, mariners must apply the Hierarchy of Hazard Controls. Solutions must be selected from the top of the pyramid down; relying on lower tiers without exhausting upper tiers violates safety management standards.

                    HIERARCHY OF HAZARD CONTROLS PYRAMID

      ┌──────────────────────────────────────────────────────────┐  ▲
      │ 1. ELIMINATION (Most Effective)                          │  │
      │    Physically remove the hazard entirely                 │  │
      ├──────────────────────────────────────────────────────────┤  │
      │ 2. SUBSTITUTION                                          │  │ EFFICACY
      │    Replace hazard with safer alternative                 │  │
      ├──────────────────────────────────────────────────────────┤  │
      │ 3. ENGINEERING CONTROLS                                  │  │
      │    Isolate people from the hazard (guards, ventilation)  │  │
      ├──────────────────────────────────────────────────────────┤  │
      │ 4. ADMINISTRATIVE CONTROLS                               │  │
      │    Change work procedures, training, signage, PTW        │  │
      ├──────────────────────────────────────────────────────────┤  │
      │ 5. PERSONAL PROTECTIVE EQUIPMENT (PPE - Least Effective) │  │
      │    Protect worker with wearable gear (Last Line Defense) │  ▼
      └──────────────────────────────────────────────────────────┘

Practical Marine Applications of the Hierarchy

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3. High-Frequency Shipboard Hazards & Prevention

A. Slips, Trips, and Falls (Highest Frequency Maritime Injury)

Slips, trips, and falls account for over 40% of all reported shipboard occupational injuries.

• High Watertight Door Coamings: Watertight doors feature raised bottom sills (coamings) measuring 15 to 24 inches (380 to 600 mm) in height to maintain subdivision integrity. Crew members carrying loads frequently trip over coamings. Rule: Never step onto a coaming sill; always step completely over it.
• Wet, Greasy Steel Decks: Seawater spray, condensation, fuel oil leaks, and loose cargo lashing gear turn steel plates into slip hazards. Decks must be painted with silica sand non-skid coatings, and oil drips must be cleaned immediately with absorbent pads.
• Three Points of Contact: When ascending or descending vertical shipboard ladders, stairs, or gangways, mariners must maintain three points of contact at all times (two hands and one foot, or two feet and one hand). Never carry tools in hands while climbing; use a tool belt, backpack, or hoisting line.

B. Manual Handling & Ergonomics

Back strains and musculoskeletal injuries result from improper lifting techniques during cargo handling, mooring line tending, and machinery overhaul.

• Lifting Ergonomics: Maintain a wide, stable base of support; bend knees and hips; keep the spine straight and vertical; lift using leg quadriceps and glutes; hold load tight against the body trunk; never twist the torso while bearing weight.
• Lifting Thresholds: The recommended maximum weight for a single person to lift safely under stable sea conditions is 20 to 25 kg (45 to 55 lbs). Any load exceeding this threshold mandates a team lift or the deployment of mechanical lifting aids (chain falls, overhead crane beams, pallet jacks, or deck winches).

C. Noise & Vibration Management

• IMO Code on Noise Levels on Board Ships (Resolution MSC.337(91)):
  • 85 dBA: Mandatory threshold for single hearing protection (earplugs OR earmuffs). Continuous exposure above 85 dBA causes permanent sensorineural hearing loss.
  • 105 dBA: Mandatory threshold for double hearing protection (earplugs AND earmuffs simultaneously). Found near main engine turbochargers, diesel generators, and purifier rooms.
  • 110 dBA: Maximum allowable sound level in any manned space without specialized acoustic enclosures.
• Hand-Arm Vibration Syndrome (HAVS): Prolonged use of pneumatic needle scalers, deck sanders, and grinders causes circulatory and nerve damage ("vibration white finger"). Anti-vibration gloves and strict operational rotation limits (max 30 min continuous tool use) are required.

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4. High-Hazard Work: Working Aloft, Overside & LOTO

                      WORKING ALOFT & OVERSIDE SAFETY GATES
                                        │
               ┌────────────────────────┴────────────────────────┐
               ▼                                                 ▼
        WORKING ALOFT (HEIGHTS)                           WORKING OVERSIDE
    • Full-body harness (certified anchor)           • Full-body harness + Lifeline
    • Independent lifeline & rope grab               • Inherently buoyant lifejacket worn
    • Shock-absorbing lanyard                        • Lifebuoy with 30m line on deck
    • Bridge: Radar/Whistle lockout                  • Dedicated deck tender standing by
    • Engine: Funnel soot blowing locked             • Safety net rigged beneath staging

Working Aloft & Overside Protocols

• Fall Protection Equipment: Mariners working at a height of 1.8 meters (6 feet) or higher, or working overside over water, must wear a certified full-body safety harness (complying with EN 361 or ANSI Z359) equipped with a shock-absorbing lanyard connected to a certified overhead anchor point capable of supporting at least 5,000 lbs (22.2 kN).
• Independent Safety Lifeline: The worker must be attached to an independent vertical lifeline equipped with a guided-type fall arrester (rope grab or inertia reel). The lifeline must be anchored separately from any working stage or bosun's chair.
• Working Overside Specifics: When suspended over the side of the hull, the mariner must wear a work lifejacket or inherently buoyant vest over their harness. A lifebuoy with 30 meters of buoyant line and a self-igniting light/smoke signal must be staged immediately above the work location on deck, manned by a dedicated tender.
• Bridge & Engine Room Lockouts:
  • Bridge Lockout: Bridge watch must de-energize and lock out all spinning radar antennas (radiation hazard) and isolate the ship's whistle / fog horn to prevent accidental acoustic trauma.
  • Engine Room Lockout: Engineers must lock out funnel soot-blowing, secure incinerator draft fans, isolate hull overboard discharges directly below the staging, and tag main engine turning gear.

Electrical Safety & Lockout/Tagout (LOTO)

Shipboard electrical distribution operates primarily at 440V, 3-phase, 60Hz on ungrounded (insulated neutral) systems. Contact with 440V in damp, salty environments is frequently fatal.

                            THE 6-STEP LOTO SEQUENCE
  ┌────────────────────────────────────────────────────────────────────────┐
  │ 1. NOTIFY & PREPARE: Alert affected departments and bridge/engine.     │
  ├────────────────────────────────────────────────────────────────────────┤
  │ 2. SHUTDOWN: Secure machinery using normal operational stop controls.  │
  ├────────────────────────────────────────────────────────────────────────┤
  │ 3. ISOLATE ALL ENERGY: Open circuit breakers, disconnect main switches.│
  ├────────────────────────────────────────────────────────────────────────┤
  │ 4. LOCKOUT & TAGOUT: Affix lockout hasp, individual padlock & red tag. │
  ├────────────────────────────────────────────────────────────────────────┤
  │ 5. DISSIPATE STORED ENERGY: Bleed hydraulics/pneumatics, discharge caps│
  ├────────────────────────────────────────────────────────────────────────┤
  │ 6. VERIFY ZERO ENERGY: Test before touch using calibrated voltmeter.   │
  └────────────────────────────────────────────────────────────────────────┘

LOTO Cardinal Rule: Every individual worker working on the circuit must place their own personal padlock on the lockout hasp. The key must remain in that worker's personal possession. Never allow a supervisor or coworker to lock out equipment on your behalf!

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5. Chemical Safety & Safety Data Sheets (SDS)

Under the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), every hazardous chemical used on board (fuel additives, boiler chemicals, paint thinners, acid descalers) must feature a standardized 16-Section Safety Data Sheet (SDS).

The 16-Section Standard SDS Structure

Emergency Eyewash & Body Showers

• Stations must be situated within 10 seconds unobstructed walking distance of chemical handling areas (battery lockers, boiler chemical dosing stations, paint lockers).
• Must deliver a continuous flow of tepid water (16–38°C / 60–100°F) for a minimum of 15 minutes.
• Eyewashes must be inspected and flushed weekly to purge rust and bacterial growth.