Where can i find the specifications/guidelines for:
1. Fire monitor water application rates for petroleum storage tanks?
2. Pump sizing requirements for said petroleum storage tanks based on amount of tanks on site?
I would start looking here, NFPA 58 - Liquefied Petroleum Gas Code
For the protection of petroleum tanks you should read NFPA 30 and the applicable API standards. If foam systems are required, then they must be designed per NFPA 11.
API does have a document with some guidelines on estimating the water demand for fire protection, but I don't remember which one is. You'll have to look into their catalog.
You might have a look at :
Many of the application rates cited in API documents originate from NFPA standards and codes
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