Is there a decision tree, or other wholistic look at what is recommended for fire protection measures for flammable and combustible liquid storage tanks?

Does flashpoint of the liquid impact which system type to pursue?

This is specifically for liquid stored in day tanks inside a tank farm, but seeking out guidance here on choosing responsible systems overall.

Thanks in advance.

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I have two above ground 20,000 gallon (US) PET storage tanks, used for food grade oil, located inside in a manufacturing facility, all above ground.

I went through NFPA 30 back and forth, still couldn't find what sort of sprinkler protection do I need for this.

Cooking oil is considered a Class IIIB liquid, and all references I could were about all other classes, but IIIB. The only reference to IIIB seems to be in smaller containers, in the rack, but no tank storage mentioned.

How do I go about designing protection for the tanks? What about the surrounding area?​​​​​​​​​​​​​​​​​​​

Thanks in advance.
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We have a customer who is building a storage building that includes flammable liquids.

The liquids are Class I-B flammable (as classified under NFPA 30).

I understand that there are limits for the quantity that is allowed within one control area. The Maximum Allowable Quantity (MAQ) is 120 gallons, from NFPA 30 tables. The reading can be increased 100% when a sprinkler system is used. 

So the limit increases to 240 gallons with sprinkler protection.

The number can increase even more when stored in approved liquid storage cabinets or safety cans, which I assume the customer would prefer.

So the final MAQ becomes 240 gallons x 2 = 480 gallons.

The biggest storage room is 2,000 square feet and the customer wants to exceed the MAQ to be above 480 gallons in that storage room.

I have understood that exceeding the MAQ is permitted if the building is classified as an H-3 Occupancy (High Hazard). This occupancy applies more restrictive requirements. 

Is there any numerical value for a new MAQ limit in that case?

My current path is as follows:
Class I-B liquid storage in Storage occupancy > maximum MAQ exceeded > building re-classified as H-3 Occupancy > but where is the new MAQ?

Thanks in advance for your input. I usually design under SFS and CEA standards, and they don't have the same MAQ concept within those standards.

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