Calculate for fuel tank exposures surface

Hi to all,
I'm a project engineer working in Chile and need to know some reference for calculating "fuel exposures surface" for diesel and gasoline vertical tanks. I had hear than exposed surface for a vertical fuel tank is the distance between quote "0" of the tank and 10 meters in high from the floor. It's that correct? Someone has a document code reference from where I can check?
Thanks
Carlos Giani from Chile

 

[25362]

Sr Giani, pregunto si Ud se refiere a la superficie expuesta a un incendio exterior .

 

[drox]

¿Este tanque a cual usted refiere, es bajo presion o atmosferica?
Puede ser API 650 (atmosferica) o ASME VIII
Is this tank under pressure or atmospheric?
It could be API 650 (atmospheric) or ASME VIII

 

[Giani]

efectivamente se trata de un parque de estanques atmosféricos de acuerdo a API 650, hice consultas a la NFPA y ellos me reconderon comprar API 2021 Managment of Atmosferic Storage Tanks Fires, espero encontrar la solución a mis dudas de proyecto, en todo caso cualquier sugerencia será muy bienvenida.
mi correo es cgiani@sispam.cl
Gracias