API 682 plan 52
api plan 52
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API Plan 52 (Unpressurised Vessel) | API 682 Piping Plan for Mechanical Seals

  • Typical Application: Suitable for dual-face, unpressurized mechanical seal configurations where buffer fluid pressure remains below seal chamber pressure.

    Buffer Fluid Reservoir

    • Provides a reserve volume for the buffer fluid.
    • Supports convenient filling, draining, and routine maintenance.

    Venting & Emission Control

    • The reservoir can be vented and connected to a recovery or flare system.
    • Helps prevent direct atmospheric release of volatile process vapors.

    Circulation System

    • Supply and return lines connect the reservoir with the seal chamber.
    • Circulation can be driven by a pumping ring or thermosyphon effect.

    Temperature Control

    • A cooling coil or external heat exchanger can be added when required.
    • Water-cooled or air-cooled configurations are available.
    • Helps control buffer fluid temperature during operation.

 

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API Plan 52 is a seal pot and buffer fluid system for dual mechanical seals. It provides unpressurized buffer fluid circulation between the two seals.

The system uses an external reservoir, circulation piping, cooling components, and instrumentation. These components facilitate continuous buffer fluid circulation for seal lubrication and cooling.

The system can direct process-side leakage and volatile gases to a recovery or flare header. This helps reduce direct atmospheric emissions and supports safe and reliable seal operation.

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