Preaction Sprinkler System Calculator

Calculate preaction system requirements for data centers, museums, freezers, and water-sensitive environments per NFPA 13.

Double interlock requires both detection AND sprinkler activation
NFPA 13 requires 60 sec max for most systems

Preaction System Types

Type Valve Opens When Best For
Single InterlockDetection activatesFreezers, museums
Double InterlockDetection AND sprinklerData centers, telecom
Non-InterlockDetection OR sprinklerModerate sensitivity

Preaction System Advantages

Water Damage Prevention

Dry piping prevents accidental water discharge from mechanical damage or corrosion leaks. Critical for data centers and archives.

Early Warning

Detection system provides alert before water flows, allowing investigation and manual intervention if it's a false alarm.

Freeze Protection

Dry piping can be used in unheated spaces without antifreeze. Common in freezers and loading docks.