What is the maximum design operating pressure for a natural gas piping system inside a building?

The maximum design operating pressure for a natural gas piping system inside a building is 5 psig. This standard is based on safety codes and practices established for natural gas distribution systems. Operating at this pressure level ensures that the system is capable of delivering adequate gas flow for appliances while minimizing risks associated with higher pressures, such as leaks or failure of the system components.

In residential and similar applications, maintaining a pressure limit of 5 psig is also important for compatibility with standard gas appliances designed to operate safely and efficiently at this range. This pressure is adequate for most heating and cooking needs while ensuring that safety protocols are adhered to. Higher pressures, like those mentioned in other options, are generally reserved for specific industrial applications and would not be suitable for typical building installations.