Which two time components make up the hydrostatic test duration for high-pressure water mist systems?

Which two time components make up the hydrostatic test duration for high-pressure water mist systems?

• A. 5 minutes at test pressure plus 115 minutes at working pressure
• B. 10 minutes at 1.5x working pressure plus 110 minutes at working pressure
• C. 60 minutes at test pressure plus 60 minutes at working pressure
• D. 30 minutes at double working pressure plus 90 minutes at working pressure

Answer: (B)

Hydrostatic testing of high-pressure water mist systems is built to verify both peak-stress resistance and long-term integrity. The test first applies a short period at an elevated pressure (1.5 times the working pressure) to reveal any immediate leaks or weaknesses in pipes, fittings, and joints. It then holds the system at the actual working pressure for a longer period to simulate real-service conditions and detect slow leaks or gradual deformations. The correct approach uses 10 minutes at 1.5x working pressure, followed by 110 minutes at the working pressure, totaling 120 minutes. This two-phase duration ensures both instantaneous pressure boundary integrity and sustained performance under typical usage. The other options don’t fit because they alter either the pressure level or the time allocation in ways that don’t align with this two-stage verification.

Hydrostatic testing of high-pressure water mist systems is built to verify both peak-stress resistance and long-term integrity. The test first applies a short period at an elevated pressure (1.5 times the working pressure) to reveal any immediate leaks or weaknesses in pipes, fittings, and joints. It then holds the system at the actual working pressure for a longer period to simulate real-service conditions and detect slow leaks or gradual deformations. The correct approach uses 10 minutes at 1.5x working pressure, followed by 110 minutes at the working pressure, totaling 120 minutes. This two-phase duration ensures both instantaneous pressure boundary integrity and sustained performance under typical usage. The other options don’t fit because they alter either the pressure level or the time allocation in ways that don’t align with this two-stage verification.