What is the maximum allowable pressure drop for gas piping systems in structures?

The maximum allowable pressure drop for gas piping systems in structures is critical for ensuring the safe and efficient operation of gas appliances. A pressure drop that is too high can lead to inadequate gas supply, resulting in improper functioning of appliances and potential safety hazards.

The value of 0.5 inches of water column (in. w.c.) is designated as the acceptable pressure drop in most gas piping applications. This standard is established to maintain a balance between system design and performance. A pressure drop of 0.5 in. w.c. is manageable and does not compromise appliance operation, ensuring that they receive an adequate gas supply under various operating conditions.

Exceeding this pressure drop can negatively impact the performance of individual appliances, subjecting them to conditions that could lead to increased emissions or failure to operate properly. Thus, maintaining the pressure drop at or below this threshold is crucial for both safety and efficiency in gas piping systems.