Size a secondary-containment dike around tank-farm aboveground storage tanks. NFPA 30 requires containment ≥ 100% of largest tank; 40 CFR 112 SPCC requires 110% for facilities > 1,320 gal aggregate. Provided volume = (dike footprint − other tank base areas) × (dike H − freeboard).
Compliance & Site
in
in
Tanks (each)
Tank #Diameter (ft)Height (ft)
1
2
3
4
5
6
Dike Footprint
ft
ft
ft
📚 Theory
NFPA 30 vs SPCC, displacement adjustment, drainage / 5-yr fire codes.