What is the second step in taking a DPV out of service?

The second step in taking a Double Check Valve Assembly (DPV) out of service involves shutting off the air supply to the DPV. This step is crucial because it ensures that there is no pressure in the system, allowing for a safe and controlled process to follow. Maintaining safety while working on pressure systems is paramount, and securing the air supply minimizes the risk of accidental discharge or release during subsequent steps.

Following this action, it would typically be necessary to proceed with other steps such as notifying the alarm company or cracking open the main drain valve, but the order of operations is designed to prevent any hazards before any additional work is done on the DPV. Shutting off the air supply also indicates to personnel that this valve assembly is being taken out of service, ensuring everyone is aware of the procedure being enacted.