In the AFFF system, what do the bildge sprinkling nozzles primarily protect?

The bilge sprinkling nozzles in an AFFF (Aqueous Film Forming Foam) system are primarily designed to protect the machinery room. The machinery room is an area where flammable liquids and gases can accumulate, posing a significant fire risk. The bilge area, which is often found in proximity to machinery and fuel systems, can contain flammable vapors, and the presence of these nozzles ensures that any ignition in this space can be quickly suppressed.

By discharging foam onto the surfaces of the bilge, these nozzles create a barrier that prevents the ignition of vapors while also cooling the surrounding area. This is crucial in maintaining safety on board, as the machinery room often contains critical systems that must be protected from fire hazards to ensure the overall integrity and operability of the vessel. Other areas such as electronics rooms or living quarters may require different types of fire suppression strategies but are not primarily served by the bilge sprinkling nozzles.