Final answer:
The question regarding piped gas pressure is incomplete and lacks context, making it impossible to provide a definitive answer without additional information on the specific gas system and its application.
Step-by-step explanation:
Piped gas pressure must be sufficient to ensure delivery of gas throughout a system but not so high as to pose safety risks. The appropriate pressure varies depending on the specific application and the design of the gas delivery system. However, the question seems to be incomplete, as it does not provide sufficient context to determine the type of piped gas system in question or its intended application, which are necessary for providing an accurate answer. Typically, residential natural gas pressure is lower, often around 7 inches of water column, which equates to approximately 0.25 psi, while commercial gas pressure may be higher. But given only the options provided, without additional context or information about the specific system, an accurate recommendation cannot be made.