I'm sorry for a delay but I didn't have access to internet during the weekend.
The only thing I can suggest is contacting your local authorities for guidelines. The following is a statement from EPA.org website, full page - http://www.epa.gov/oust/faqs/heatoil.htm
Are Heating Oil Tanks Regulated?
Heating oil includes several grades of petroleum fuel oils: No. 1, No. 2, No. 4-light, No. 4-heavy, No. 5-light, No. 5-heavy, No. 6, Navy Special Fuel Oil, and Bunker C. No.2 diesel fuel and kerosene are not defined as heating oil, but are considered a substitute for heating oil when used for heating purposes only.
Consumptive use is not intended to be limited to heating purposes only: the definition extends to any on-site use including heating, generating emergency power, and generating steam, process heat, or electricity. The exclusion does not apply to tanks storing heating oil for resale.
The premises is not limited to the building where the heating oil is stored; it includes anywhere on the same property. Thus, centralized heating units using heating oil that serve more than one building on the same property would qualify for exclusion.