API Plan 41

• 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.

• Horizontal pumps conveying hot media with heavy solids.
• Horizontal pumps conveying hot water with sand or slag inclusions.

• 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.

• Suspended solids
• Poor lubrication
• High temperature
• Close to vaporization point

• Process side
• Flushing and cooling

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.