Plan 23

Description:
Product recirculation from seal chamber to heat exchanger and back to seal chamber
Features:
- Circulation is maintained by a pumping ring when pump is energized
- When pump is idle, circulation is maintained by thermosiphon effect
- Provides lower product stabilization temperature
- Can establish required fluid vapor point margin
For use:
- In hot and clean service such as boiler feed water and hot hydrocarbon services
Caution:
- Maintain less than 20” horizontal distance from seal chamber to heat exchanger
- Vent valve required at highest point of the piping system
- Seal chamber must have a close clearance throat bushing
- The seal outlet port must be facing up
- The cooler must be mounted above the pump centerline
- Fully vent the system before start up