In gas piping, what does bonding ensure?

Bonding in gas piping is essential because it ensures that there is an electrical connection between various metal parts of a gas system, which helps to reduce the risk of static electricity buildup. This is particularly important in preventing sparks that could ignite flammable gases. When the gas piping is properly bonded, it helps maintain a low resistance path to the ground, allowing any electrical currents, including those from static discharge, to dissipate safely.

This practice is crucial for safety and compliance with relevant codes and standards. Proper bonding is part of the overall design of gas piping systems, ensuring that any potential electrical issues do not compromise the system's integrity or pose a hazard.

The other options, while related to safety and performance in gas systems, do not accurately reflect the role of bonding. For instance, gas seals are intended to prevent leaks but are not the focus of the bonding process. Thermal expansion and pressure regulation are related to the operational and structural integrity of the piping system but do not involve the electrical safety aspects that bonding addresses.