Which condition must piping, tubing, and fittings withstand?

The requirement that piping, tubing, and fittings must withstand hydrostatic tests of at least four times the rated working pressure is crucial for ensuring their safety and reliability in high-pressure environments. This condition provides a significant safety margin beyond normal operational pressures, allowing for any potential weaknesses in the material to be identified before actual use.

Hydrostatic testing involves filling the system with water and applying pressure to ensure that it can handle conditions beyond what it will typically encounter during operation. By testing to four times the rated working pressure, manufacturers can determine if there are any leaks or structural weaknesses. This is especially important because it helps prevent catastrophic failures that could lead to gas leaks or explosions, safeguarding both people and the environment.

This rigorous testing standard is part of industry practices to ensure all components meet strong safety criteria and perform effectively under high stress, thus contributing to the overall integrity of the gas delivery system. Other choices may not address the critical need for such high safety margins or suggest conditions that don’t align with standard testing protocols for CNG systems.