方案四

　　What

　　wal

　　Seal flush from pump discharge through orifice

　　Default single seal flush plan

　　Why

　　Seal chamber heat removal

　　Seal chamber venting on horizontal pumps .

　　Increase seal chamber pressure and fluid vapor margin .

　　Where

　　General applications with clean fluids

　　Clean ,non-polymerizing fluids .

　　Preventative Maintenance

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

　　Calculate flow rates to size orifice for adequate seal chamber

　　flow .

　　Increase boiling point margin with proper orifice and throat

　　bushing sizing

　　Flush should be directed over seal faces with piping at 12

　　O'clock position .

　　Typical failure mode is a clogged orifice - checktemperatures

　　at pipe ends