During acoustical non-volumetric testing, what is a risk if the nitrogen pressure exceeds normal operating pressure?

During acoustical non-volumetric testing, what is a risk if the nitrogen pressure exceeds normal operating pressure?

• A. Increased leak rate
• B. Rupture of the tank
• C. Evaporation of contents
• D. No risk

Answer: (B)

In acoustical non-volumetric testing, the tank is pressurized with nitrogen to enable leak detection while keeping the volume effectively the same. Keeping the pressure within the tank’s normal operating limit is crucial because overpressurizing adds excess hoop stress to the walls. That extra stress can exceed the design strength of the tank, leading to rupture or catastrophic failure. This is the primary safety risk of exceeding the specified pressure. While a higher pressure might make a leak more detectable, the fundamental concern is the potential for structural failure from overpressure. Evaporation of contents isn’t the central risk in this gas-pressure test, and saying there’s no risk ignores the real danger of bursting the tank. Always adhere to rated pressures and proper relief procedures to prevent overpressure.

In acoustical non-volumetric testing, the tank is pressurized with nitrogen to enable leak detection while keeping the volume effectively the same. Keeping the pressure within the tank’s normal operating limit is crucial because overpressurizing adds excess hoop stress to the walls. That extra stress can exceed the design strength of the tank, leading to rupture or catastrophic failure. This is the primary safety risk of exceeding the specified pressure.

While a higher pressure might make a leak more detectable, the fundamental concern is the potential for structural failure from overpressure. Evaporation of contents isn’t the central risk in this gas-pressure test, and saying there’s no risk ignores the real danger of bursting the tank. Always adhere to rated pressures and proper relief procedures to prevent overpressure.