What is required to prevent electrostatic buildup in tanks when using crude oil washing systems?

To effectively prevent electrostatic buildup in tanks when using crude oil washing systems, grounding the tank is essential. The correct measure involves attaching a grounding cable to the tank. This practice ensures that any static electricity that builds up during the crude oil washing process can be safely discharged to the ground, thereby minimizing the risk of ignition and potential accidents.

Electrostatic discharge can occur due to the movement of fluid within the tank, especially because crude oil can generate static electricity when it is agitated. By grounding the tank, you create a pathway for the electrical charge to dissipate safely, which is a critical safety measure when handling flammable materials like crude oil.

Other mentioned options do not directly address the prevention of electrostatic buildup. Decanting, maintaining tank pressure, or restricting the use of materials do not effectively mitigate static electricity’s hazards as a grounding cable does. Ensuring proper grounding is a fundamental safety procedure in oil and chemical processing industries.