Combined dry-pipe pre-action systems are required to have manual operation of the detection system.

Combined dry-pipe pre-action systems are required to have manual operation of the detection system.

• A. False
• B. True
• C. Not specified
• D. Only during maintenance

Answer: (B)

Combined dry-pipe pre-action systems hold water back in the piping until an initiating action occurs, then a manual step completes the process to release water into the pipes. In this setup, the detection system isn’t enough on its own to flood the dry pipes; there is a required manual action (such as operating a pull station or valve actuator) to release the pre-action valve and allow water to fill the pipes. This two-step interlock protects against false discharges and ensures a deliberate response to an actual threat. Therefore, having manual operation of the detection system is required as part of the system’s normal operation.

Combined dry-pipe pre-action systems hold water back in the piping until an initiating action occurs, then a manual step completes the process to release water into the pipes. In this setup, the detection system isn’t enough on its own to flood the dry pipes; there is a required manual action (such as operating a pull station or valve actuator) to release the pre-action valve and allow water to fill the pipes. This two-step interlock protects against false discharges and ensures a deliberate response to an actual threat. Therefore, having manual operation of the detection system is required as part of the system’s normal operation.