Pre-action fire sprinkler systems are a type of fire sprinkler system that utilizes a pre-action valve in conjunction with a standard fire sprinkler system. The pre-action valve is designed to prevent water from flowing into the system until a fire is detected.
Pre-action systems are typically used in buildings that house valuable items, such as art galleries, libraries, and computer server rooms, as they are less likely to accidentally discharge water and cause damage. Pre-action systems can also be used in areas where freezing temperatures are a concern, as they can prevent water from freezing in the pipes and damaging the system.
The pre-action valve is typically controlled by a fire alarm system or a smoke detection system. When a fire is detected, the pre-action valve opens and allows water to flow into the system, activating the fire sprinklers.
Pre-action systems are usually divided in two types:
- Dry pipe pre-action systems: In this type, the pipes are filled with pressurized air or nitrogen and the water is held back by a valve until a fire is detected.
- Wet pipe pre-action systems: In this type, the pipes are filled with water but the water does not flow through the sprinkler heads until a fire is detected.
Pre-action systems can be more complex than traditional fire sprinkler systems, and require regular maintenance and testing to ensure that they are functioning properly. They also require a higher level of expertise for installation and maintenance, and it’s important to hire a qualified professional to install and maintain a pre-action system.