The test pressure required by NFPA 58 when testing dispenser piping for leakage is at:

The test pressure required by NFPA 58 when testing dispenser piping for leakage is at:

• A. Normal operating pressure
• B. 1.5 times normal operating pressure
• C. Twice the design pressure
• D. Full rated pressure

Answer: (A)

Leakage testing of dispenser piping is done at the pressure the system will operate at in service. Pressurizing the piping to normal operating pressure allows you to see leaks under the exact conditions the system will experience when propane is being dispensed. If you tested at a higher pressure, you could either force leaks that wouldn’t occur during regular use or risk unnecessary stress or damage to components. NFPA 58 specifies leakage testing at the operating pressure so the test reflects real-world performance and ensures joints and connections are truly tight when the system is in service. Higher-pressure tests serve other purposes in different sections of the code, not leakage testing for dispenser piping.

Leakage testing of dispenser piping is done at the pressure the system will operate at in service. Pressurizing the piping to normal operating pressure allows you to see leaks under the exact conditions the system will experience when propane is being dispensed. If you tested at a higher pressure, you could either force leaks that wouldn’t occur during regular use or risk unnecessary stress or damage to components. NFPA 58 specifies leakage testing at the operating pressure so the test reflects real-world performance and ensures joints and connections are truly tight when the system is in service. Higher-pressure tests serve other purposes in different sections of the code, not leakage testing for dispenser piping.