Sub surface or Surface foam inyection system for fire fighting

[JoseAcevedo]

For fuel Storage tanks fire protection I have the following questions:

1.- When sub surface foam inyection system is recommended?.
2.- Best Inyection foam system for Diesel & Jet A1 (sub surface or surface inyection).
3.- Application rate of foam for Diesel, Jet A1, HFO (Heavy Fuel Oil) & Gasoline.
4.- Type of foam conentrate to be use eather in sub surface or surface inyection system.
5.- Is sub suface foam inyection system recommended for fire fighting in vertical storage tanks with Diesel or Jet A1