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Description
  • Country of manufactureIndia
In a steam turbine inlet which includes an annular steam strainer stationarily positioned therein for stopping the passage into the turbine of large metal particles in the steam, the improvement in the strainer which comprises a plurality of spaced through holes in a major portion of the strainer circumference, the through holes being of differing diameters, with holes of like diameter being positioned in longitudinally-extending, circumferential zones, holes of the largest diameter being disposed in zones where metal particles are least likely to enter the holes, holes of smaller diameter being disposed in zones where metal particles are most likely to enter the holes, and a longitudinally-extending, circumferential zone in the strainer without holes where the particles velocity and direction of movement would be damaging to any holes located in such a zone, the through holes each having an entrance end on the outer periphery of the strainer, an exit end on the inner periphery of the strainer, and an interior portion disposed between the entrance end and exit end, the exit end having a larger diameter than the interior portion to reversably slow steam velocity and decrease steam pressure drop.
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