Plan 32

Description:

Injection of external source of liquid into the seal chamber

Features:

• Reduce flashing or air intrusion across seal faces
• Can maintain vapor point margin
• Must be provided at pressure higher than the seal chamber pressure
• Provides the best seal environment of all single seal plans

For use:

• Dirty or contaminated fluids
• High temperature applications
• Polymerizing and oxidizing fluids
• Media with poor lubricating properties

Caution:

• External source must be continuous and reliable, even during start up and shut down
• Flush fluid must be compatible with process fluid and should not vaporize at process temperature
• Product dilution will occur
• Use with close clearance throat bushing to maintain pressure and reduce flush flow
• Understand the cost of flush fluid, several gallons per minute consumption is typical