Does NFPA 30, 31, 37 Apply to Diesel Generators?

What NFPA Standard(s) apply for two diesel generator tanks?

Two diesel generators (not emergency or standby), outside (but have enclosures) with each diesel tank stored underneath, the tank is rectangular in shape and has ~5,000 gallons of diesel fuel.

Looking at the following code path; IMC Chapter 13 for fuel oil piping and storage and IFC Chapter 6--> 605.4 Fuel Oil Storage Systems --> storage above ground in quantities exceeding 660 gallons --> NFPA 31; OR IMC Chapter 9 engine and gas turbine-powered equipment and appliances.

Is this approach correct?

In reviewing both NFPA 37 and NFPA 31, both seem to be applicable; however, when it comes to "outside aboveground tanks" of this capacity, they both reference NFPA 30 (Section 6.3.3 for NFPA 37 and 7.9.3 for NFPA 31).

So here's the main question - is NFPA 30 applicable here?

I base this on a few things:

1. NFPA 30 Scope section 1.1.2 item 9 - it says it is NOT applicable to "liquids in fuel tanks of... stationary engines" ; and
2. All the boundary and tank to tank separation requirements throughout chapter 22 are based on the diameter of the tank.

This leads me to believe this standard was not written for the type of tanks I have, but instead typical giant circular storage tanks.?

Any insight is greatly appreciated.

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