Mechanical seal flushing plans are standardized piping arrangements defined by API 682 to cool, lubricate, clean, and pressurize seal chambers, extending seal life and ensuring reliable operation. Below are the most common plans with concise English descriptions for technical documentation and catalogs.
Basic Internal Recirculation Plans
- Plan 01
Internal flow passages within the pump casing circulate process fluid to the seal chamber without external piping. Simple, low-cost, and suitable for clean, low-temperature services.
- Plan 11
Process fluid recirculates from the pump discharge through a flow-control orifice to the seal chamber. The most widely used plan for clean fluids, providing effective cooling and lubrication with minimal complexity .
- Plan 13
Fluid flows from the seal chamber back to the pump suction via a restricted orifice. Ideal for vertical pumps to prevent vapor locking and ensure continuous venting .
Cooled & Filtered Recirculation Plans
- Plan 21
Discharge fluid passes through a heat exchanger (cooler) and flow-control orifice before entering the seal chamber. Designed for high-temperature applications to lower seal chamber temperature .
- Plan 22
Combines Plan 21 with a Y-strainer to filter solids from the recirculating fluid. Suited for fluids with light particulate contamination .
- Plan 23
Closed-loop circulation with a dedicated heat exchanger; fluid is pumped from the seal chamber, cooled, and returned. Highly efficient for extreme-temperature services, minimizing process fluid usage .
External & Specialized Plans
- Plan 32
Clean, compatible fluid from an external source is injected directly into the seal chamber. Used for dirty, polymerizing, or high-solids fluids to isolate the seal from process contaminants .
- Plan 41
Recirculation with a cyclone separator to remove solids from the flush stream. Effective for fluids with moderate to high solid content .
Dual Seal Support Plans
- Plan 52
Unpressurized buffer fluid system for dual seals; circulates buffer fluid between inner and outer seals with a reservoir and heat exchanger. Used for toxic or hazardous fluids .
- Plan 53A/B/C
Pressurized barrier fluid systems for dual seals, maintaining barrier fluid pressure above process pressure to prevent leakage. Available with bladder accumulators (53A), piston accumulators (53B), or external pumping (53C) .
- Plan 54
Pressurized barrier fluid supplied from an external source to dual seals. Suitable for critical, high-pressure, or corrosive applications requiring continuous clean fluid supply .
Jiaxing Burgmann Mechanical Seal Co., Ltd
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