What is the pressure drop that can be tolerated in a natural gas system for the configuration described in the flashcards?

In a natural gas system, the tolerated pressure drop is crucial for ensuring efficient operation and safety. A pressure drop of 0.3 inches of water column (in. w.c.) is generally considered a limit that allows for adequate gas flow while minimizing the risk of operational issues such as insufficient pressure for appliances to function correctly.

This specific value accounts for typical factors such as the length of the piping, any bends or restrictions in the system, and the overall demand of the gas appliances connected. A pressure drop of 0.3 in. w.c. is practical, ensuring that appliances receive enough pressure to operate effectively while providing a margin that can account for minor variances in system conditions.

Higher values of pressure drop could indicate potential issues in the pipeline, such as blockages or undersized piping, which could lead to symptoms like incomplete combustion in appliances, inefficient heating, or even safety hazards. Therefore, the chosen threshold of 0.3 in. w.c. represents a balance between operational efficiency and safety within the usual parameters of a residential or commercial natural gas system.