NEBOSH Practice Test

What is the main fire protection measure used on a floating roof tank?

1. Water spraying systems

2. Fixed foam installations

3. Fire-resistant coatings

4. Smoke detectors

The correct answer is: Fixed foam installations

Floating roof tanks are commonly used for storing large quantities of liquids, particularly in the petroleum industry. These tanks are designed to minimize the evaporation of volatile compounds by having a roof that floats directly on the surface of the liquid. However, they can be susceptible to fire hazards due to the presence of flammable vapors. The main fire protection measure employed on floating roof tanks is the use of fixed foam installations. This is because foam can effectively suppress fires and control vapors by creating a blanket that covers the liquid surface. The foam works by preventing oxygen from reaching the burning liquid and by cooling the area, helping to mitigate the risk of fire and explosion. Foam systems are specifically designed to address the unique risks associated with floating roof tanks, particularly during scenarios when there is a fracture in the floating roof or when the tank is filled with flammable liquids. The ability of foam to quickly suppress a fire can be crucial in preventing a small incident from escalating into a larger catastrophe. Other fire protection measures like water spraying systems can sometimes be used, but they may not be as effective as foam installations in this specific context. Fire-resistant coatings serve a different purpose, primarily aimed at protecting the structure rather than actively suppressing a fire. Smoke detectors play a role in