What is the primary reason for grounding during fuel transfer operations?

Grounding during fuel transfer operations is primarily used to prevent static electricity buildup. When fuel is transferred, friction between the fuel and the transfer equipment can generate static electricity. If this static charge is not properly dissipated, it can lead to sparks or electrical discharges that may ignite flammable vapors, creating a dangerous situation. By grounding the equipment and the fuel source, any built-up static electricity is safely directed into the ground, significantly reducing the risk of fire or explosion.

While equalizing pressure, maintaining temperature control, and stabilizing fuel flow are important aspects of fuel transfer operations, they do not directly address the critical safety concern of static electricity. Grounding effectively mitigates this risk and is a key safety practice in ensuring safe fuel handling.