The building requires sprinklers and is equipped with a wet-pipe system. What action should you recommend for the computer room?

A pre-action sprinkler system is the industry-standard recommendation for protecting computer rooms and data centers. Unlike a wet-pipe system, a pre-action system requires two independent events to occur before discharging water: typically, the activation of a detection system (e.g., smoke detectors) and the activation of a sprinkler head due to heat. This dual-trigger mechanism provides a critical safeguard against accidental water discharge from leaks or a single point of failure, thereby protecting sensitive and high-value electronic equipment from water damage while still ensuring effective fire suppression in the event of a genuine fire.

A. Maintain the current wet-pipe system: This poses an unacceptably high risk of accidental water damage to sensitive IT equipment from pipe leaks or inadvertent sprinkler head activation.
B. Replace the wet-pipe system with a deluge system: A deluge system would flood the entire room from all sprinkler heads simultaneously upon activation, causing catastrophic and widespread damage. It is meant for high-hazard industrial areas.
D. Replace the wet-pipe system with a dry-pipe system: While it prevents water from sitting in the pipes, it still discharges upon a single event (sprinkler head activation) and is less effective at preventing accidental discharge than a pre-action system.

1. Geng, H. (2014). Data Center Handbook. Wiley.

Section 11.4.2.2, "Preaction Sprinkler Systems," p. 263: "Preaction sprinkler systems are specialized for use in locations where accidental activation is undesired, such as in... computer rooms, data centers with high-value computer equipment... The double interlock preaction system provides a high degree of assurance against accidental water discharge."

Section 11.4.2.1, "Wet Pipe Sprinkler Systems," p. 263: This section describes the system but implicitly highlights its unsuitability for data centers due to the constant presence of water in the pipes, which increases the risk of leaks.

2. University of Wisconsin–Madison, Department of Engineering Professional Development. (Courseware). Fire Protection in Mission Critical Facilities.

Module: Special Suppression Systems: The course materials detail that pre-action systems, particularly double-interlocked types, are the preferred water-based solution for data centers. They are specified to "prevent inadvertent water discharge on sensitive electronic equipment" by requiring confirmation from both a detection system and a sprinkler head before releasing water.