1. Flammable liquid tanks can only be installed inside buildings in the form of underground tanks and are intended solely for diesel and biodiesel.
2. Exceptions to item 1 of this annex include above-ground tanks for the consumption of diesel and biodiesel used to power engines for electricity generation in emergency situations, to ensure operational continuity, or for the operation of water network pressurization pumps for fire fighting, in cases where it is proven impossible to install them underground or outside the building’s horizontal projection.
2.1 The installation of the tank inside the building must be preceded by a Project and Preliminary Hazard/Risk Analysis (PHA/PRA), both prepared by a qualified professional, addressing the safety, health, and environmental aspects provided in regulatory standards, national technical standards, and, in their absence or omission, international standards, as well as other relevant regulations, and must comply with the following criteria:
a) It must be located on the ground floor, basement, or pilotis, in an area exclusively designated for this purpose;
b) It must have a leakage containment system;
c) Tanks must be housed in an internal enclosure with walls resistant to fire for at least 2 (two) hours and equipped with fire doors;
d) The maximum capacity must be up to 5,000 (five thousand) liters per tank and per enclosure, as well as a limit of 10,000 (ten thousand) liters per building, which applies to each building, regardless of interconnection between buildings through garages, walkways, tunnels, etc.;
e) Approval by the competent authority is required;
f) Tanks must be metallic;
g) They must have automatic fire detection and suppression systems, as well as emergency exits dimensioned according to technical standards;
h) Tanks must be located so as not to block access to emergency exits and fire safety systems in case of an emergency;
i) Tanks must be protected against physical damage and proximity to heat-generating equipment or ducts;
j) The need for protection against vibration and physical damage in the connection system between the tank and the generator must be assessed;
k) The building structure must be protected to withstand a potential fire originating in the areas housing the tanks; and
l) Necessary measures must be taken to ensure tank ventilation for pressure relief, as well as safe fueling operation and disposal of gases produced by combustion engines.
2.1.1 Item 2.1(d) of this annex does not apply to tanks attached to the generator structure.
2.2 The person responsible for the building’s safety must designate a technical manager for the installation, operation, inspection, and maintenance, as well as for supervising safety procedures during the tank refueling process.
2.3 Workers involved in the operation, inspection, maintenance, and refueling activities of the tank must be trained with an Intermediate Course, as provided in Annex I.
3. For underground tanks, the provisions in item 2.1(b), (e), (f), (g), (h), (i), (j), (k), and (l), item 2.2, and item 2.3, as well as those in national technical standards, and in their absence or omission, in international technical standards, apply.
4. The content of Annex III applies only to buildings and does not apply to installations whose concepts are defined in the Glossary of this Standard.
4.1 Items 1 to 3 of this annex do not apply to above-ground surface tanks located inside industrial installations, provided they do not constitute the situation defined in item 2 of this annex.