33 50 00 Hydrocarbon Utilities
33 56 00 Hydrocarbon Storage
33 56 13 Aboveground Hydrocarbon Storage Tanks 33 56 21 Ground-Level Fixed Roof Hydrocarbon Storage Tanks 33 56 21.13 Double-Wall Ground-Level Fixed Roof Metallic Hydrocarbon Storage Tanks 33 56 21.16 Single-Wall Ground-Level Fixed Roof Metallic Hydrocarbon Storage Tanks 33 56 21.23 Single-Wall Ground-Level Fixed Roof Non-Metallic Hydrocarbon Storage Tanks 33 56 21.26 Double-Wall Ground-Level Fixed Roof Non-Metallic Hydrocarbon Storage Tanks 33 56 23 Ground-Level External Floating Roof Hydrocarbon Storage Tanks 33 56 26 Ground-Level Internal Floating Roof Hydrocarbon Storage Tanks 33 56 33 Underground Hydrocarbon Storage 33 56 33.13 Double-Wall Metallic Underground Hydrocarbon Storage Tanks 33 56 33.23 Single-Wall Metallic Underground Hydrocarbon Storage Tanks 33 56 33.26 Single-Wall Non-Metallic Underground Hydrocarbon Storage Tanks 33 56 33.29 Double-Wall Non-Metallic Underground Hydrocarbon Storage Tanks 33 56 33.43 Underground Hydrocarbon Storage Caverns 33 56 43 Aviation Fuel Storage Tanks 33 56 43.13 Ground-Level Aviation Fuel Storage Tanks 33 56 43.53 Underground Aviation Fuel Storage Tanks 33 56 53 Compressed Gaseous Hydrocarbon Storage Tanks 33 56 60 Moveable Hydrocarbon Storage Tanks 33 56 93 Hydrocarbon Tank Linings 33 56 96 Hydrocarbon Storage Tank Appurtenances