41 50 00 Material Storage
41 52 00 Bulk Material Storage
41 52 13 Bins and Hoppers 41 52 13.13 Fixed Bins and Hoppers 41 52 13.23 Portable Bins and Hoppers 41 52 13.33 Bulk Material Containers 41 52 13.43 Returnable Bins and Hoppers 41 52 13.53 Throwaway Bins and Hoppers 41 52 16 Silos 41 52 16.13 Concrete Flat-Bottom Silos 41 52 16.16 Concrete Masonry Flat-Bottom Silos 41 52 16.23 Concrete Cone-Bottom Silos 41 52 16.26 Concrete Masonry Cone-Bottom Silos 41 52 16.29 Steel Cone-Bottom Silos 41 52 19 Bulk Materials Storage Tanks 41 52 19.13 Stationary Bulk Materials Storage Tanks 41 52 19.33 Mobile Bulk Materials Storage Tanks 41 52 41 Pneumatic, Block-Distributed Materials Fluidizing System for Flat-Bottom Bins and Silos 41 52 43 Aerated Trough Materials Fluidizing System for Flat-Bottom Bins and Silos 41 52 46 Pad-Mounted Aerated Disc Materials Fluidizing System for Cone-Bottom Bins and Silos