What is a disadvantage of a wet pipe sprinkler system?

• A. Possible freezing
• B. Low water supply
• C. High energy use
• D. Excessive noise

Answer: (A)

Wet pipe sprinkler systems keep water in the pipes, so they respond very quickly when a sprinkler head is activated. The main drawback is the risk of freezing in unheated or cold environments. If the surrounding temperature drops below freezing, the water inside the pipes can freeze, expand, and cause pipes or fittings to crack or burst, leading to leaks and potential water damage before the system can effectively control the fire. To reduce this risk, these systems are usually heated or insulated, or alternative designs like dry pipe systems (where pipes aren’t filled with water until activation) are used in cold areas. This is why freezing is considered a disadvantage of wet pipe systems.