Recirculation from seal chamber to pump suction through
Standard flush plan on vertical pumps .
Continuous seal chamber venting on vertical pumps .
Seal chamber heat removal
Vertical pumps .
Seal chamber pressure is greater than suction pressure .
Moderate temperature fluids with moderate solids .
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
Reduce seal chamber pressure with proper orifice and throat
Typical failure mode is clogged orifice check temperatures
at pipe ends