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In Piping Plan 01, integral (internal) recirculation is from a high-pressure region of the pump to the seal chamber.
NOTE Piping Plan 01 is similar to a Piping Plan 11 except that internal porting is used to direct flow to the seal chamber from an area behind the impeller near the discharge. This porting also serves to vent the chamber during commissioning of the pump. This plan is recommended for clean fluids only. Piping plan 01 may be useful with liquids that thicken or solidify at normal ambient temperatures to minimize the risk of freezing the fluid in flush piping.Special attention is needed to ensure that the recirculation supplied is sufficient for the seal operating requirements.
Piping plan 01 is not recommended for vertical pumps because of difficulty in venting the seal chamber.
Malavazi NOTE: For liquids with crystallization characteristics, Quench is recommended due to micro leakage on the faces, otherwise plug the injection connection leaving the drain free to prevent environmental disasters, since the floating ring will act as a safety point.