Which medium is not permitted for pressure testing of hydrogen piping systems?

Which medium is not permitted for pressure testing of hydrogen piping systems?

• A. Nitrogen
• B. Helium
• C. Oxygen
• D. Carbon Dioxide

Answer: (C)

The use of oxygen as a medium for pressure testing hydrogen piping systems is prohibited due to the inherent risks associated with its explosive properties when combined with hydrogen. Oxygen can create a highly reactive and potentially dangerous environment, especially at elevated pressures that occur during testing. This could lead to severe accidents, including explosions. In contrast, nitrogen and helium are safer alternatives for pressure testing because they are inert gases and do not react with hydrogen under normal conditions. Carbon dioxide, while not typically used for hydrogen systems, does not pose the same reaction risks that oxygen does. Thus, oxygen's high reactivity and the potential for catastrophic incidents make it an unacceptable choice for pressure testing in these systems.

The use of oxygen as a medium for pressure testing hydrogen piping systems is prohibited due to the inherent risks associated with its explosive properties when combined with hydrogen. Oxygen can create a highly reactive and potentially dangerous environment, especially at elevated pressures that occur during testing. This could lead to severe accidents, including explosions.

In contrast, nitrogen and helium are safer alternatives for pressure testing because they are inert gases and do not react with hydrogen under normal conditions. Carbon dioxide, while not typically used for hydrogen systems, does not pose the same reaction risks that oxygen does. Thus, oxygen's high reactivity and the potential for catastrophic incidents make it an unacceptable choice for pressure testing in these systems.