What is the first step to take a DPV out of service?

The first step in taking a Double Check Valve Assembly (DPV) out of service is to notify the alarm company. This is crucial because the DPV is a critical component in a fire protection system. By alerting the alarm company, they can ensure that any alarms or systems relying on the DPV's operation are monitored properly during the maintenance process.

Taking such precautions is important for safety and compliance with fire codes, ensuring that any potential hazards are adequately addressed while work is being performed on the system. Additionally, notifying the alarm company ensures that they can respond to any notifications or alarms that might trigger in the meantime.

The subsequent steps, such as shutting off the air supply or opening the main drain valve, are necessary to safely conduct maintenance on the DPV but should occur only after the proper notifications have been made. Ensuring that all stakeholders are informed is a critical component of operational safety in any alarm-dependent system.