After a full flow test on a water spray system how shall the system be returned to service?

• A. In accordance with the direction of the Authority Having Jurisdiction.
• B. In accordance with the manufacturer instructions.
• C. In the presence of the insurance underwriter.
• D. Using the same procedures as that for the preaction and dry valves

Answer: (B)

The key idea is that re-commissioning after a full flow test must follow the manufacturer’s instructions. Those instructions specify exactly how to restore pressure, reset controls and alarms, close any bypasses, and bring all valves back into their correct positions in the proper sequence. This ensures the system is reassembled and re-energized as designed, preserving safety, reliability, and any warranty or warranty-related expectations.

While the Authority Having Jurisdiction may require notification or approval for changes, the actual steps to return the system to service are defined by the equipment maker. Insurance underwriter involvement isn’t a standard part of the re-service process, and applying preaction/dry valve procedures isn’t appropriate for a sprayed water system’s normal re-commissioning after a full flow test.