How many systems are designated as water mist systems?

Water mist systems are recognized primarily as two distinct types: high-pressure water mist systems and low-pressure water mist systems. Each of these has specific applications and characteristics that differentiate them.

High-pressure water mist systems operate at pressures typically greater than 1000 psi and create small water droplets that can effectively cool and displace oxygen, making them suitable for a wide range of fire scenarios, including those involving flammable liquids and electrical fires.

Low-pressure water mist systems, on the other hand, work at pressures below 175 psi, producing larger droplets that can still effectively suppress fires but do so in different ways compared to their high-pressure counterparts. They are often used in various applications, such as in shipboard firefighting or in areas where water supply is limited.

Given the existence of these two distinct systems, the characterization of water mist systems as being two in number accurately reflects the current understanding and classification within the field of fire protection and safety engineering.