What is the specific gravity of natural gas used in the NFPA 54 pipe sizing capacity tables?

The specific gravity of natural gas used in the NFPA 54 pipe sizing capacity tables is 0.60. This value is critical because specific gravity plays a significant role in determining the flow characteristics of gas within a piping system. A lower specific gravity indicates that the gas is lighter than air, which affects how it disperses and flows through various pipe sizes.

In the context of the NFPA 54 guidelines, using the correct specific gravity ensures accurate calculations for gas pressure requirements, capacity, and overall safety in gas systems. This value is derived from common natural gas compositions, which typically have a specific gravity close to 0.60, allowing for standardization in design and installation practices across the industry.

Understanding and correctly applying this specific gravity in calculations is essential for compliance with safety standards, ensuring efficient system performance, and minimizing the risks associated with gas installations.