You can consider the application rate of 2lpm/m2 for the surface area of the tank. Cooling requirement for roof will be more crytical. Just imagine that the tank on fire is full with oil and the roof just breaks of (weeak shell to roof design. The roof surface of the neighbouring tanks will be...
Sorry that this reply is much delayed, I hope you still go through the responses.
IP 19 is a code published by Institule of Petroleum (British). You may be able to get a copy of it through the British Council or a good agent in your area. The 2-lpm/min/m2 is the requirement as per IP 19...
NFPA 30 indicates that tanks located as per Section 2.0 does not need any cooling system. We generally do a heat radiation study considering fuel characteristics, height of tank, location w.r.t other tanks and wind velocity. IP 19 clearly describes the protection (cooling) required for various...
