This is something outside my area of expertise, as I’ve never worked in the oil or fuel industries. The two best references on static electricity hazards and good practices are the books from CCPS by Tom Pratt, and also by Larry Britton. Here are the web references for the books:

Avoiding Static Ignition Hazards in Chemical Operations by Laurence G. Britton

Electrostatic Ignitions of Fires and Explosions by Thomas H. Pratt