olmedo,
At a PR rum distillery, a foam system was used:
The Canadians use this:
"Subsection 4.9.3.
Storage Tanks and Containers
Storage tanks, wooden vats, aging barrels, drums or containers used to store or process alcohol must be designed, fabricated and tested in accordance with good engineering practices to withstand the anticipated maximum operating pressure or temperature. Storage tanks used for ethyl alcohol may be steel or stainless steel (for purity).
Good engineering practices are provided in a guide recommended by The Distilled Spirits Council of the United States Inc., entitled "Recommended Fire Protection Practices for Distilled Spirits Beverage Facilities."
Since exposed steel supports do not have a 2 hour fire-resistance rating they require protection as do the timber supports for tanks. Automatic sprinklers have proven to be an effective means of achieving the required protection provided there is enough space under the tank to install them. "
Try these guys...
Oh, .......and gimmie a star
-MJC
The design of the normal and emergency venting should be such that accumulation of flammable vapours inside the building is prevented. New tank installations can achieve this by directing breather vents and emergency vents, equipped with flame arresters or pressure/vacuum valves, to the outside of the building.
If ventilation design principles are applied to the building ventilation, venting into the building space may be acceptable for existing installations. Such measures include, but are not limited to: installation of automatic sprinklers throughout the tank room and under any raised tanks greater than 1.2 metres in diameter; classification of electrical equipment and wiring according to the zone classifications of the "Canadian Electrical Code"; provision of adequate natural or mechanical ventilation meeting the objectives of Article 4.9.6.1.; and training of personnel in safe operating procedures.