What is the specified pressure for natural gas systems as per NFPA 54?

The specified pressure for natural gas systems according to NFPA 54 is indeed 0.5 psi. This pressure is established to ensure safe and effective operation within the gas distribution system. Most residential and commercial natural gas systems are designed to operate safely at low pressures, and 0.5 psi is a standard maximum for those systems. This lower pressure helps in minimizing the risk of leaks and explosions, making it safer for users.

In addition, the code guidelines for installation, maintenance, and operation are informed by this pressure limit, ensuring equipment, appliances, and piping are appropriately rated for the pressures they will encounter. Higher pressures, as seen in other options, are typically associated with other types of gas systems and may not be suitable or safe for typical residential applications. Using the correct pressure not only complies with safety regulations but also optimizes the performance of the gas systems.