Plan 31 - Single seals - By-pass from discharge through an abrasive separator
Description: Plan 31 is a variation of Plan 11, where an abrasive separator is added to the flush line. In this plan, the product is introduced to the abrasive separator from the discharge of the pump, clean flush is piped from the separator to the seal chamber and solids are returned to the pump suction.
Advantages: Unlike a strainer or filter, the abrasive separator does not require cleaning. Solids are removed from the flush stream keeping the seal clean.
General: This plan should be used for services containing solids that have a specific gravity at least twice that of the process fluid. Typically the separator requires a minimum pressure differential of 15 psi to operate properly.
Note: A abrasive separator is subject to wear and must be maintained regularly to ensure efficient operation.