NFPA 58 requires that hose assemblies shall be leak tested ______.

NFPA 58 requires that hose assemblies shall be leak tested ______.

• A. Before installation
• B. At System Operating Pressure
• C. During maintenance
• D. At test pressure

Answer: (B)

Leaking hose assemblies undermine safety, so the test focuses on how the hose will perform in real use. NFPA 58 specifies that the leak test for hose assemblies be done at the system operating pressure, meaning you pressurize to the pressure the system will actually experience during normal operation. Testing at this pressure checks the integrity of the hose, fittings, and connections under realistic conditions and catches leaks that would matter in service. Using the system’s operating pressure avoids applying excessive stress that higher test pressures could cause, which could damage components or mask the true performance under normal use. While other steps may occur in different contexts (such as pre-installation checks or maintenance activities), the code requirement for this test is to verify leaks at the operating pressure the system will see.

Leaking hose assemblies undermine safety, so the test focuses on how the hose will perform in real use. NFPA 58 specifies that the leak test for hose assemblies be done at the system operating pressure, meaning you pressurize to the pressure the system will actually experience during normal operation. Testing at this pressure checks the integrity of the hose, fittings, and connections under realistic conditions and catches leaks that would matter in service. Using the system’s operating pressure avoids applying excessive stress that higher test pressures could cause, which could damage components or mask the true performance under normal use. While other steps may occur in different contexts (such as pre-installation checks or maintenance activities), the code requirement for this test is to verify leaks at the operating pressure the system will see.