EagleBurgmann international
EagleBurgmann WORLDWIDE
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Products
API Plan 21
API Plan 21
Recirculation from pump discharge through a flow control orifice and cooler into the seal chamber.
A Flow control orifice
B Cooler
C Temperature indicator
Seal chamber details
1 From high pressure region of pump (pump discharge or pump discharge piping)
2 Flush (F)
3 Quench (Q)
4 Drain (D)
5 Seal chamber
Example seal: EagleBurgmann H75VA4-S single pusher mechanical seal.
P&ID according to API
Key
TI Temperature indicator
Features
- Provides a cool flush to the seal.
- Plan 21 is self-venting.
- Improves the product temperature margin to avoid vapor formation.
- Helps reduce coking.
- Helps improve lubricity (e.g. hot water).
- Utilizes a close clearance throat bushing for better efficiency.
Application
- Fluids with low vapor pressure margin in seal chamber.
Remarks, checkpoints
- Minimum size of the orifice should be 3 mm (1/8").
- High cooler duty is leading to fouling and plugging on the water side.
- Plan 21 consumes more energy than Plan 23 because the fluid needs to be pumped back continuously.
- Potential plugging on the process side if the fluid viscosity gets high quickly.
Pump media characteristics
- Close to vaporization point.
- Hot, non-polymerizing clean fluids typically less than 176 °C (349 °F).
- Bad lubricity fluids (like hot water).
Location, function
- Process side
- Flushing and cooling
- Increases vapor pressure margin
Configurations
1CW-FL, 1CW-FX, 2CW-CW, 2CW-CS, 3CW-FB
3CW-BB*, 3CW-FF*, 3NC-FB*, 3NC-BB*, 3NC-FF*
* Remark: The configurations listed for each individual piping plan are to be understood as recommendations including possible utilizations which may also be applied.
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