Plan 14 - Single seals - By-pass from discharge through seal chamber back to suction
Description: Plan 14 is a combination of Plans 11 and 13. Flush is taken off of pump discharge, sent to the seal chamber, and piped back to pump suction.
Advantages: Cooling can be optimized with the flush directed at the seal faces. Plan allows for automatic venting of the seal chamber.
General: Often used on vertical pumps to provide adequate flow and vapor pressure margin independent of throat bushing design.