Facts & Figures Book - KPI-JCI

Screenin gscreen typically runs very steep when screening at veryfine openings. A primary feature of the incline screen isits relatively low cost. It may also have a lower operatingcost by using less horsepower and having fewer shaftsand bearings.FACTS ABOUT INCLINE SCREENS:1. Incline screens have an operating angle of typically10-35 degrees.2. Produce a higher material travel speed and a thinnerbed depth than a flat screen, reducing the potential formaterial spill-over from volumetric surges.3. Size for size, incline screens are more economical interms of capital expenditure and power consumptionthan a flat screen, and requires fewer shaft assembliesand parts to maintain and replace.4. The increased profile height provides more accessibilityfor maintenance, screen media changes, etc.5. Circular stroke pattern produces fewer “G’s” than flatscreens, more of a “tumbling” motion. The material has atendency to pick up velocity as it moves down the deck.6. Can be configured to retain material on the deckslonger by rotating the screen’s direction, essentiallythrowing the material backwards.BASED ON THIS DATA, AN INCLINED SCREENIS RECOMMENDED WHEN THE FOLLOWINGCONDITIONS EXIST:• The producer has a relatively consistent feed volumeand gradation to the screen.• The desired results can be achieved with the strokepattern being produced by a single or dual shaftassembly.• The material is relatively dry (in dry applications) anddoes not plug the opening.• All of the above are true and the producer does notrequire a low-profile height.• Large volumetric surges of material that could potentiallyspill over the rear and sides of flat screens arefrequent.• A replacement screen is required to fit within existingor fixed screen towers/structures.• The economics of capital expenditure and maintenanceare top priority.142