Seal flush from pump discharge and recirculation to pump
suction with orifices
Combination of Plan 11 and Plan 13
Continuous seal chamber venting on vertical pumps .
Seal chamber heat removal
Increase seal chamber pressure and fluid vapor margin .
Vertical pumps .
Clean ,non-polymerizing fluids at moderate temperatures
Use an orifice with a minimum 3 mm ( 1/8inch )diameter .
Calculate flow rates to size orifice for adequate seal chamber
Increase boiling point margin with proper orifice and throat
Flush should be directed over seal faces .
Vent piping loop prior to starting vertical pumps .
Typical failure mode is a clogged orifice check temperatures
at pipe ends