Fire on board fishing vessels presents a significant hazard to safety, property, and the environment. Given the confined spaces and presence of flammable materials on fishing boats, a fire outbreak can escalate rapidly, threatening lives and the vessel’s operational capability. Understanding the causes of marine fires is essential for fisheries technology professionals in Kenya to implement effective prevention and firefighting measures that safeguard crew members and protect valuable fishing assets.

1.1 Causes of Marine Fires

The causes of fires on board fishing vessels are varied but often stem from human error, equipment failure, or environmental factors. In Kenya’s coastal fisheries, where vessels operate under challenging conditions, awareness of these causes is critical for reducing fire risks. Identifying and addressing these causes early can prevent devastating consequences such as loss of life, damage to catch, and loss of livelihood.

1.1.1 Electrical Faults as a Cause of Marine Fires

Electrical faults are among the most common causes of fires on fishing vessels due to the extensive use of electrical equipment for navigation, communication, and fish processing. Faulty wiring, overloaded circuits, and poor maintenance increase the risk of sparks or short circuits igniting flammable materials nearby.

Characteristics of Electrical Faults Leading to Fires

• Short Circuits: Occur when electrical current flows along an unintended path, generating heat capable of igniting surrounding materials such as insulation or wooden structures.
• Overloaded Circuits: Excessive current draw from multiple devices can cause wiring to overheat, especially in older vessels with limited electrical capacity.
• Faulty Equipment: Defective motors, switches, or appliances can produce sparks or heat, initiating combustion.
• Corrosion and Moisture: Saltwater exposure accelerates corrosion of electrical connections, increasing resistance and heat generation.
• Improper Installation: Non-compliance with marine electrical standards can lead to inadequate insulation and unsecured cables, heightening fire risk.

In practice, a fishing vessel operating off the coast of Mombasa suffered an electrical fire when a faulty refrigerator motor overheated, igniting nearby wooden panels. Regular inspection and maintenance of electrical systems, as practiced by some county fisheries departments, can mitigate such risks.

1.1.2 Fuel and Oil Leaks as Ignition Sources

Fishing vessels rely heavily on fuel and lubricants for engine operation, making fuel and oil leaks a critical fire hazard. The presence of flammable liquids in confined engine rooms or deck areas creates potential for fires if leaks come into contact with ignition sources.

Factors Contributing to Fuel and Oil Leak Fires

• Poor Maintenance of Fuel Lines: Cracked or loose fuel hoses can spray fuel onto hot engine parts.
• Spillage During Refueling: Inadequate procedures or faulty fuel caps cause fuel to spill, increasing flammable vapour concentration.
• Engine Overheating: Excessive heat from engines or exhaust systems can ignite leaked fuel or oil.
• Improper Storage: Storing fuel containers near heat sources or in poorly ventilated compartments facilitates fire outbreaks.
• Vandalism or Unauthorized Access: Unsecured fuel storage areas may be tampered with, increasing leakage and fire risk.

1.1.3 Human Error and Unsafe Practices

Human error remains a significant cause of marine fires, often linked to negligence, lack of training, or disregard for safety procedures. Crew members’ actions can inadvertently create ignition sources or fail to control fire hazards effectively.

Common Unsafe Practices Leading to Fires

• Smoking in Prohibited Areas: Ignition from cigarettes in engine rooms or near fuel storage can spark fires.
• Improper Use of Electrical Appliances: Using damaged or unauthorized electrical devices increases fire risk.
• Blocking Fire Exits and Escape Routes: Accumulating waste or goods in passageways hampers evacuation and firefighting efforts.
• Failure to Extinguish Open Flames: Leaving cooking stoves or lamps unattended can cause accidental fires.
• Inadequate Fire Watch: Neglecting to monitor high-risk areas after maintenance or refueling allows smouldering fires to develop unnoticed.

In a case at a beach landing site, a fire started when a crew member discarded a cigarette butt near flammable packaging materials. Training programs for fishers emphasize adherence to safety protocols to reduce such incidents.

1.1.4 Spontaneous Combustion of Organic Materials

Certain organic materials common on fishing vessels, such as oily rags, fish waste, and coal dust, can undergo spontaneous combustion under specific conditions. This type of fire arises without an external ignition source, making it particularly dangerous.

Conditions Leading to Spontaneous Combustion

• Accumulation of Oily Waste: Oil-soaked cloths generate heat as oils oxidize, eventually igniting if improperly stored.
• Poor Ventilation: Confined storage areas with limited airflow trap heat, accelerating combustion processes.
• Heat Build-Up in Fish Waste: Decaying fish offal produces heat and gases, which can ignite if waste is piled near combustibles.
• Presence of Combustible Dust: Fine dust particles from dried fish or coal can ignite from friction or static electricity.
• Neglecting Waste Disposal: Failure to regularly remove and properly store waste materials increases fire risk.

A fishing vessel operating out of Kilifi experienced a fire in the waste storage compartment attributed to spontaneous combustion of oily rags. Proper waste management and ventilation are critical to prevent such occurrences.

Fire Classes (A, B, C, D, and F) in Fisheries Technology

In the maritime fisheries sector, understanding the classification of fires is vital for effective response and safety management on board fishing vessels and at fish processing facilities. Different types of fires require specific extinguishing agents and techniques. This knowledge ensures that fire incidents are controlled swiftly to protect lives, vessel integrity, and valuable fishing equipment. Kenyan fisheries professionals must be familiar with the characteristics of each fire class encountered in their work environment to choose appropriate firefighting methods.

1.1.1 Class A Fires: Ordinary Combustible Materials

Class A fires involve materials commonly found on fishing vessels and fish processing units, such as wooden crates, fishing nets made of textile fibers, paper packaging, and cardboard boxes. These materials burn with glowing embers and produce ash when consumed by fire. The primary characteristic of Class A fires is that they require cooling to extinguish, as the heat sustains the combustion process.

• Water is the most effective extinguishing agent for Class A fires because it cools the burning material below its ignition temperature and helps prevent re-ignition.
• Steam generated by water application also smothers the fire by displacing oxygen.
• Using foam can also be effective as it blankets the fire and prevents oxygen access.
• Dry chemical powders are less effective but can be used if water or foam is unavailable.
• Class A fires are common on fishing boats where wooden decks, crates, or waste paper accumulate, making vigilance essential.

1.1.2 Class B Fires: Flammable Liquids and Liquefiable Solids

Class B fires involve flammable liquids such as petrol, kerosene, lubricating oils used in fishing engines, and greases found in machinery maintenance. These fires are particularly hazardous on fishing vessels because of the presence of fuel tanks and oily residues.

• These fires burn on the surface of the liquid, and pouring water can spread the fire by dispersing the burning liquid.
• Foam extinguishers are most effective because they form a blanket over the liquid surface, cutting off oxygen.
• Dry chemical powder extinguishers interrupt the chemical reaction of the fire and can be used for small spills.
• Carbon dioxide (CO₂) extinguishers displace oxygen but are mainly effective in enclosed spaces.
• Proper storage and handling of fuels on fishing vessels reduce the risk of Class B fires.

1.1.3 Class C Fires: Flammable Gases

Class C fires involve gases such as methane, propane, butane, and acetylene, which might be present on vessels using gas-powered equipment or in fish processing plants using gas cylinders for heating.

• These fires are highly explosive and require special attention due to the risk of rapid spreading and flashbacks.
• Extinguishing involves shutting off the gas supply to stop the fuel source.
• Dry chemical powders are commonly used to interrupt the combustion reaction.
• Water should be avoided as it can spread the flames or cause dangerous reactions.
• Proper maintenance and secure storage of gas cylinders onboard fishing vessels are critical safety measures.

1.1.4 Class D Fires: Combustible Metals

Class D fires involve combustible metals such as magnesium and lithium, which are rare but may occur in specialized fishing equipment or electronic components.

• These fires burn at extremely high temperatures and react violently with water.
• Special dry powder extinguishers designed for metal fires must be used; water and foam are ineffective and dangerous.
• Smothering the fire by covering it with dry sand or special powders removes oxygen.
• Training in handling metal fires is essential for safety officers on larger fish processing facilities.
• Prevention involves proper storage and handling of metal powders or shavings.

1.1.5 Class F Fires: Cooking Oils and Fats

Class F fires involve cooking oils and fats, which are common in fish processing and onboard galley kitchens of fishing vessels.

• These fires burn at high temperatures and can reignite even after extinguishing.
• Wet chemical extinguishers are specifically designed for Class F fires, cooling the oil and creating a soap-like foam that smothers flames.
• Using water on oil fires causes splattering and rapid fire spread.
• Proper kitchen hygiene and maintenance of cooking appliances reduce the risk.
• Staff training in galley fire safety is essential for fish processing plants and fishing vessels.

Chapter Summary

This chapter explored the causes of marine fires, highlighting common ignition sources and conditions that lead to onboard fire incidents. It examined the classification of fires into classes A, B, and C, explaining the distinct materials and hazards associated with each type. The concept of the fire triangle was discussed to show how heat, fuel, and oxygen interact to sustain combustion. Methods for identifying fires early were outlined to ensure prompt and effective response. Different types of fire scenarios encountered on vessels were analyzed to tailor appropriate firefighting strategies. The chapter emphasized the importance of regular equipment inspection to maintain readiness and safety. It also covered the proper use of fire blankets as a critical tool for smothering small fires. Finally, fire containment techniques and reporting protocols were detailed to minimize damage and ensure compliance with maritime safety regulations.