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In Piping Plan 62, a quench stream is brought from an external source to the atmospheric side of the seal faces. The quench stream can be low-pressure steam, nitrogen, or clean water. It is used in selected single seal applications to exclude the presence of oxygen to prevent coke formation (for example, hot hydrocarbon services) and to flush away undesirable material buildup around the dynamic seal componentes (for example, caustic and salt services).
Piping Plan 62 is most effective when used with a close clearance bushing or containment device in the seal gland. This bushing not only contains the quench in the seal gland but also provides protection for the operator if a high-temperature quench is used. The drain port outlet should be larger than the quench portinlet. The drain port shall be sized to allow drainage of the quench medium.