Does anybody have run into any code references NEC-NFPA, API referring requirement for grounding above ground DIESEL storage tanks? I have heard arguments that Diesel being higher flash point does not have issues of fires due to static discharge.
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You ground tanks for structural grounding reasons. This is not NEC. See NFPA 780, or the API standards for storage tanks.
Diesel does not have a vapor problem. Drop a match in it and it puts it out. Also it is not a “dry” liquid...no static charge from transfers. So you ground like you do a building, nothing special for the fuel.