Which type of tank is designed to reduce the risk of vapor ignition?

Floating roof tanks are specifically designed to reduce the risk of vapor ignition by minimizing the amount of vapor space that can accumulate above the liquid surface. These tanks feature a roof that floats on the surface of the liquid, rising and falling with the liquid levels. This design limits the exposure of volatile vapors to the atmosphere, thereby decreasing the likelihood of ignition.

The floating roof design helps to maintain a tighter seal with the liquid, which reduces the evaporation of volatile organic compounds (VOCs) into the air. As a result, these tanks significantly lower the risk of vapor clouds forming that could ignite. This is particularly important for facilities storing flammable liquids, as vapor ignition can pose serious safety hazards.

Other tank types, such as fixed roof tanks and atmospheric tanks, do not provide the same degree of vapor control, making them more prone to creating hazardous vapor conditions. Pressurized tanks are designed to hold substances at a greater pressure and may not effectively mitigate vapor formation in the same way as floating roof tanks. Thus, the floating roof tank design stands out for its effectiveness in reducing the risk of vapor ignition.