Fuel storage tanks at major industrial sites present one of the most serious fire risks imaginable.
At petrochemical, oil and gas, aviation and mining facilities, these tanks often store enormous volumes of highly flammable liquids, including crude oil, diesel, petrol and chemicals. Even relatively small ignitions around tank seals or vents can result in large scale and deadly or damaging fires.
The ongoing worldwide fuel crisis as a result of the war between Iran and the United States-Israel coalition has accentuated the value of fuel and put the spotlight on measures to prevent or minimise the impact of tank fires. Such events underline the importance of having the right fire-suppression equipment on fuel tanks to protect lives and infrastructure assets.
How fuel tank fires happen
When industrial fires occur, the consequences can be multi layered, with fatalities, environmental contamination and infrastructure loss among the common outcomes. Large tank fires can also shut down production, affect transport and supply chains, and contaminate soil and water on site and nearby.
Large fuel storage tanks are particularly vulnerable because they contain combustible vapours that can ignite under certain conditions. One of the most common causes is lightning strikes, particularly for tanks with floating roof tanks that are located in outdoor areas.
These tanks commonly have an open topped cylindrical steel shell with a roof that floats on the surface of the stored liquid. They are at risk from direct and indirect effects of lightning. A nearby lightning strike, for example, can cause electrical currents to flow, or arc, across the tank shell and roof, igniting flammable vapours. Static electricity that is generated during fuel transfer operations is another major risk, especially when tanks are filled or emptied too quickly.
Other likely causes of fires include equipment malfunction, overfilling, leaking pipelines, ruptures, human error during maintenance, welding sparks, electrical faults and inadequate grounding systems.
Once a tank fire starts, the outcomes can be severe. Heat often weakens tank walls and roof structures, potentially causing the roof to collapse or sink into the fuel, leading to a full surface fire that is difficult to extinguish. Fires may also spread to adjacent tanks, creating chain-reaction incidents across tank farms.
Measures to secure fuel storage
The high stakes around fuel and fires means securing fuel storage is a critical aspect of risk management at industrial sites.
Facilities typically rely on multiple layers of protection, including lightning and fire detection systems, foam suppression units, spill containment infrastructure and grounding systems. Operators often also focus heavily on inspection regimes because worn seals, corrosion, leaks and equipment failures can dramatically increase the chance of ignition.
Clearly, tanks should be kept in sound condition, with attention to seals, vents and any equipment being used in hazardous areas. Operators can also reduce risk by training staff, controlling hot work, and keeping flammable vapours from building up in or around the tank.
For their part, fire protection experts such as Delta Fire typically offer and deploy a range of specialised fire protection technologies. Foam dosing and foam suppression systems are among the most widely used solutions. These systems mix foam concentrate with water to create a blanket that suppresses vapours, cools fuel surfaces and cuts off oxygen supply to the flames.
Lightning protection systems also play a key role. They use grounding networks, bonding systems and surge protection devices to safely dissipate lightning energy and reduce the likelihood of ignition from electrical discharge. Proper grounding and bonding are particularly important in preventing dangerous sparking between floating roofs and tank shells.
Another increasingly important technology is linear heat detection wiring. These specialised cables detect abnormal heat anywhere along their length and can rapidly trigger alarms or activate suppression systems. Such systems are especially useful around floating roof seals, pipelines and other high-risk areas where early fire detection is essential.
Foam tank generators and deflectors are also a crucial component of the fire suppression strategy. A foam pourer produces low, expanded foam that is spread over the flammable liquid with the help of the deflectors to suffocate and put out fires.
Together, these sophisticated systems work best as part of an overall safety strategy, rather than as standalone solutions. It is also essential to engage the services of experienced fire suppression experts that can draw on the latest knowledge technologies. The best fire suppression providers can deliver a comprehensive solution that provides peace of mind for industrial site operators and their workers and customers.
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