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方案十二

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冲洗方案
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  What

  What

  Fluid is circulated by a pumping ring in the dual seal

  assembly .

  Why

  Outboard seal acts as a safety backup to the primary seal .

  Zero to very low process emissions .

  No process contamination is allowed

  Where

  Used with dual unpressurized seals .

  High vapor pressure fluids ,light hydrocarbons

  Hazardous /toxicfluids

  Heat transfer fluids

  Preventative Maintenance

  Piping loop must self-vent to vapor recovery /flaresystem

  near atmospheric pressure .

  Process vapor pressure generally greater than reservoir

  pressure .

  Buffer fluid must be compatible with process leakage .

  Primary seal leakage is indicated by increased vent pressure .

  Reservoir level indicator shows outboard seal leakage .

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