Antifreeze systems that contain a backflow preventer between the antifreeze piping and the wet pipe system must be equipped with

Antifreeze systems that contain a backflow preventer between the antifreeze piping and the wet pipe system must be equipped with
A . a relief valve.
B . a sight glass.
C . an accelerator.
D . an expansion chamber.

View Answer

Answer: D

Explanation:

Antifreeze systems equipped with a backflow preventer must include an expansion chamber to accommodate the expansion of the antifreeze solution due to temperature changes. This prevents excessive pressure buildup that could damage the system or cause unintended discharge.

Reference: NFPA 13 and NFPA 25 requirements for antifreeze systems in sprinkler installations, emphasizing safety features to accommodate the physical properties of antifreeze solutions.