How is a wet pipe sprinkler system different from a dry pipe system?

A wet pipe sprinkler system is characterized by having water stored within the piping at all times, which ensures that when a sprinkler head is activated due to heat, water is immediately discharged. This design allows for quick response and effective suppression of fires, as water is readily available without the delay of filling the pipes upon activation.

In contrast, a dry pipe system contains air or nitrogen that keeps the pipes pressurized. When a sprinkler head activates, the pressurized air is released, allowing a valve to open and water to flow into the pipes only at that point, which introduces a delay in response time compared to wet pipe systems.

The other options do not accurately describe the fundamental differences between wet and dry pipe systems. For example, a dry pipe system does not activate solely with heat; it relies on the release of the pressurized air to allow water flow upon activation. Additionally, wet pipe systems typically use water, not foam agents, which are reserved for specialized applications. Finally, it is incorrect to say that a dry pipe system has water continuously in the pipes; it only fills with water when the system is activated.

Overall, the defining feature of a wet pipe system is the presence of water at all times, making it distinct and effective for immediate