The foam system type that uses a pressure vessel and bladder is which?

The foam system type that uses a pressure vessel and bladder is which?

• A. Fixed system
• B. Deluge system
• C. Wet-pipe
• D. Dry-pipe

Answer: (A)

Foam systems that use a bladder-tank arrangement store the foam concentrate in a dedicated pressure vessel where a flexible bladder separates air from the concentrate. When the system activates, incoming water compresses the air in the bladder, increasing pressure on the foam concentrate and forcing it through a proportioner into the water stream for discharge. This setup provides a reliable, metered foam solution and keeps the concentrate isolated until deployment. Wet-pipe and dry-pipe are standard sprinkler configurations without a bladder-pressurized foam tank, and a deluge system is about unvalved water distribution through all open heads; neither describes the bladder-tilled, pressure-vessel foam storage used in fixed foam systems.

Foam systems that use a bladder-tank arrangement store the foam concentrate in a dedicated pressure vessel where a flexible bladder separates air from the concentrate. When the system activates, incoming water compresses the air in the bladder, increasing pressure on the foam concentrate and forcing it through a proportioner into the water stream for discharge. This setup provides a reliable, metered foam solution and keeps the concentrate isolated until deployment. Wet-pipe and dry-pipe are standard sprinkler configurations without a bladder-pressurized foam tank, and a deluge system is about unvalved water distribution through all open heads; neither describes the bladder-tilled, pressure-vessel foam storage used in fixed foam systems.