Which foam-water system uses a piping system containing air under pressure with a supplemental detection system in the same area as the sprinklers?

Which foam-water system uses a piping system containing air under pressure with a supplemental detection system in the same area as the sprinklers?

• A. Foam-water Deluge System
• B. Foam-water Spray System
• C. Foam-water Preaction System
• D. Foam-water Dry Pipe System

Answer: (C)

This describes a foam-water preaction system. In this setup, the piping is charged with air under pressure and a supplemental detection system is installed in the same area as the sprinklers. Water is held back by a preaction valve and will not enter the pipes until the detection device detects a fire and releases the valve. Once water begins to fill the piping, foam concentrate is introduced to create the foam-water mixture at the sprinklers. This two-stage release helps prevent accidental discharge and ensures foam-water is deployed only when a fire is detected. Other foam-water types don’t use this air-filled, detection-triggered release in the same way, which is why they don’t match the description.

This describes a foam-water preaction system. In this setup, the piping is charged with air under pressure and a supplemental detection system is installed in the same area as the sprinklers. Water is held back by a preaction valve and will not enter the pipes until the detection device detects a fire and releases the valve. Once water begins to fill the piping, foam concentrate is introduced to create the foam-water mixture at the sprinklers. This two-stage release helps prevent accidental discharge and ensures foam-water is deployed only when a fire is detected. Other foam-water types don’t use this air-filled, detection-triggered release in the same way, which is why they don’t match the description.