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Piping Plan 02 has a dead-ended seal chamber with no recirculation of flushed fluid.
Piping Plan 02 is more common in the chemical industry in applications with low seal chamber pressures and process temperatures. The process fluid should be relatively clean to avoid excessive erosion of the seal gland, seal chamber, or seal parts created by the swirling flow pattern. The vapor pressure sensitivity of the process fluid should also be taken into consideration to avoid flashing conditions in the seal chamber or at the seal faces. Piping Plan 02 can be used with cool clean fluids with high specific heats, such as water, in relatively low-speed pumps. The product temperature margin should be carefully reviewed for any application where the selection of Piping Plan 02 is being considered.
Pumps may optionally be provided with cooling or heating jackets to assist in controlling the temperature in the seal chamber. Cooling jackets are prone to fouling in high-temperature applications and shall be used only with great care.
Malavazi NOTE: For liquids with crystallization characteristics, Quench is recommended due to micro leakage on the faces, otherwise plug the injection connection (flush inlet) leaving the drain free to prevent environmental disasters, since the floating ring will act as a safety point.