What is the maximum gas piping system design pressure for systems used inside of a building?

The maximum gas piping system design pressure for systems used inside of a building is indeed 5 psig. This limit is established to ensure both safety and functionality within the confines of residential and commercial buildings. At this pressure, systems can effectively deliver gas for heating, cooking, and other applications without exceeding safe operational thresholds that could lead to leaks or catastrophic failures.

Designing systems to operate at this pressure provides a good balance between ensuring adequate supply for appliance operation while minimizing the potential hazards associated with higher pressures, such as increased risk of leakage and the structural considerations of piping materials. Exceeding this pressure would typically necessitate additional safety measures and perhaps even different types of materials that can handle higher pressures, which adds complexity and cost to the system.

Understanding the pressure limits in gas piping systems is crucial for technicians, as it also governs compliance with local codes and standards that are put in place to safeguard public health and safety.