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Products
API Plan 41
API Plan 41
Recirculation from the pump discharge through a cyclone separator delivering the clean fluid to a cooler and then to the seal chamber. The solids are delivered to the pump suction line.
A Cyclone separator
B Cooler
C Temperature indicator
D Contaminated liquid IN
E Clean liquid OUT
F Separated liquid OUT
Seal chamber details
1 From cooler
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
- Plan 41 is a variant of Plan 31 (Plan 31 + cooler).
- A 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 the pump suction.
- The cooler cools down the media and improves the pressure margin to the vapor pressure.
Application
- Horizontal pumps conveying hot media with heavy solids.
- Horizontal pumps conveying hot water with sand or slag inclusions.
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.
- Not applicable for extremely contaminated media. Plan 32 is recommended in such cases.
- Cooler performance is high and may lead to water side fouling.
- 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 solids
- Poor lubrication
- High temperature
- Close to vaporization point
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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