D r y f i n e s C r e e n i n G Single Deck Screen T wo Size Separation Capability Double Deck Screen with Hood Enclosures s in G le an D Double Deck Dry s creenin G m achines Dry Screening Machines A wide assortment of single deck and double deck dry screening machines are available from Derrick Each machine is custom engineered for the required duty and installation and comes complete with the appropriate feed box product collection hoppers and dust enclosure The covers and doors on the dust enclosures together with side openings on the vibrating screen frame permit easy access for inspection or screen surface replacement The lower deck screen surfaces on double deck machines can even be replaced without having to remove the upper deck screen surfaces Compared with other types of vibrating screens structural requirements are considerably less with Derrick screens since they transmit virtually no dynamic load to the surrounding support structure 15