What is the minimum pressure required for testing new fuel gas piping?

The minimum pressure required for testing new fuel gas piping is set at 3 psi. This pressure level is specified to ensure that the piping can withstand the operational conditions it is expected to encounter once it is in service. By testing at 3 psi, the integrity of the entire system can be evaluated, including the joints, fittings, and any other connections, ensuring there are no leaks that could pose safety hazards.

Testing at this pressure helps identify potential issues before the piping is put into use, ensuring compliance with safety standards and regulations. A higher pressure for testing might further ensure the integrity of the system, but 3 psi is the absolute minimum mandated for a reliable assessment of the piping's functionality.

In contrast, lower pressure values do not provide sufficient verification of the system's resilience against leaks under normal operating conditions, which are typically higher than the testing pressure. Therefore, the correct answer is grounded in safety and compliance with established codes for fuel gas piping systems.