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方案五

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  What

  Recirculation from seal chamber to pump suction through

  orifice .

  Standard flush plan on vertical pumps .

  Why

  Continuous seal chamber venting on vertical pumps .

  Seal chamber heat removal

  Where

  Vertical pumps .

  Seal chamber pressure is greater than suction pressure .

  Moderate temperature fluids with moderate solids .

  Non-polymerizing fluids

  Preventative Maintenance

  Vent piping loop prior to starting vertical pumps .

  Use an orifice with a minimum 3 mm ( 1/8inch )diameter .

  Calculate flow rates to size orifice for adequate seal chamber

  flow .

  Reduce seal chamber pressure with proper orifice and throat

  bushing sizing

  Typical failure mode is clogged orifice check temperatures

  at pipe ends

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