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for
industrial processing of dry granular materials and powders
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Pipeline and Gravity Separators
| Operation: Pipeline units are intended for inlet pipe connection at the center bottom and discharge pipe connection at the side, near the top. For gravity units, fluid is fed into an open bowl at the top and discharged through a centered port with pipe thread connection at the bottom. Flow must be controlled external to the unit to insure that the matrix is always fully flooded, so that flow is uniform, with low velocity through the matrix, where magnetic separation takes place. |
| Maximum
working pressure: The series F2 models for pipeline installation
are designed for maximum working pressure of 150 psi. (Special units with ASME Code higher pressure vessels are available.) |
| Maximum product temperature: All listed Series F2 models: 176°F (80°C); special series F2 models with thermal insulation, as well as water cooling for higher product temperatures are available. |
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Field intensity, field gradient and energy gradient. The F2 series is designed for high performance in separating fine ferromagnetic particles under difficult processing conditions. Background magnetizing fields measured in the empty separating chamber (with pole pieces but without the matrix in place) are at least 2500 Oersteds, more than twice that of models in the F1 series. With the matrix in place the background field is substantially above 2500 Oersteds. The background field induces a field several times more intense in the collecting elements. A high field gradient is provided at the collecting edges; the dimensions and orientation of the elements are essential to these high gradients. Energy gradient (HdH/dX) at the collecting edges of a standard matrix element fabricated of steel ribbon 1/4" in width and 0.02" thick is calculated as 7.2 x 1011 Gauss2/cm, assuming that the field induced in the steel near the edge is about 8500 Gauss, as measurements indicate. |
| Materials of construction: Metallic product-contact parts are types 303 and 304 stainless steel with the exception of those that carry magnetic flux. Most of those parts are type 430 stainless steel, which is highly ferromagnetic. Gravity models have anodized aluminum bowls. Standard matrix elements (“grids”) are nickel-brazed. Spiders (removable pole pieces at either end of matrix) – may also be made of hot rolled carbon steel, nickel-braze coated for corrosion resistance. |
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Matrices: The standard matrix is composed of grids fabricated of type 430 stainless steel ribbon. A ribbon crimped to provide uniform open spaces is spiral wound with a flat ribbon and nickel brazed for rigidity. The matrix supplied for a particular application is composed of grids selected for ribbon dimensions and size openings suitable for the material to be processed. Matrices made of compressed fine stainless steel wool are available for magnetic filtration of low-viscosity liquids and vapors containing no particles larger than 50 microns. Matrices composed of sheets of expanded type 430 stainless steel formed to simulate the ribbon-wound grids are also available. Since many more sheets than grids can be stacked in a given space, these matrices provide more collecting surface than the standard matrix. They are useful for magnetic filtration of liquids with low solids content, particularly when relatively long operating cycles are desirable. Expanded metal sheets are less rigid and durable than standard grids, and result in higher pressure drops |
