A hydrostatic test should be made at which pressure for how long?

A hydrostatic test is a procedure used to verify the integrity of pressure vessels, including piping systems used in fire protection. The correct answer indicates that a hydrostatic test should be conducted at a pressure of 200 PSI for a duration of 2 hours.

This specific pressure and duration are established standards to ensure that the system can withstand operational pressures significantly above what it normally faces. The purpose of the extended duration (2 hours) is to allow for monitoring any potential leaks or weaknesses in the system that may not be immediately apparent.

Testing at 200 PSI provides a margin above usual operational resources, ensuring that the system can handle potential surges and stresses safely. It is crucial because if a system is unable to hold this elevated pressure, it indicates a potential failure point which could lead to catastrophic consequences in a real-world scenario.

Other choices suggest pressure and time combinations that may not align with the accepted standards for hydrostatic tests, which is why they are not considered correct. Proper adherence to testing protocols is essential for fire safety and compliance with fire codes.