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Products
API Plan 31
API Plan 31
Recirculation from the pump discharge through a cyclone separator delivering the clean fluid to the seal chamber. The solids are delivered to the pump suction line.
A Cyclone separator
B Contaminated liquid IN
C Clean liquid OUT
D Separated liquid OUT
Seal chamber details
1 From clean discharge connection of cyclone separator
2 Flush (F)
3 Quench (Q)
4 Drain (D)
5 Seal chamber
Example seal: EagleBurgmann SH single pusher mechanical seal.
P&ID according to API
Features
- Plan 31 is a variant of Plan 11 (Plan 11 + cyclone separator).
- The cyclone separator removes solids and prevents all but a few minor particles from reaching the seal chamber.
- The media properties retained as solids are routed back to pump suction.
Application
- Horizontal pumps conveying media like water with sand particles.
- Horizontal pumps conveying media with heavy suspended solids.
Remarks, checkpoints
- Specific gravity of the solids should be at least twice that of the pumped media. In other cases Plan 32 is recommended.
- The installation of the pump throat bushing must be ensured.
- Do not use for extremely contaminated media. Plan 32 is recommended in such cases.
- Can lead to reduced reliability due to abrasive wear inside the cyclone.
- Routine inspection of the cyclone for abrasive wear is recommended.
Pump media characteristics
- Suspended fluids
Location, function
- Process side
- Flushing and cooling
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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