Pump problem
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Process design: The heavy components at the bottom of the pressurized distillation tower are transported to the flash tower via a pump. The flow rate at the bottom of the tower is less than 0.1 m³/h, and the temperature of the material is around 120°C. What type of pump should be used? Is a return line needed?
Select the pump based on the material volume. When the flow rate is less than 20 tons per hour and the head is greater than 150 meters, a reciprocating pump should be used. If the transport volume is greater than 20 tons per hour, a centrifugal pump can be used. The process requires a flow rate variation of 30% to 100%, and adjustments via the return line are taken into account.
The return line is connected from behind the pump outlet valve to the pump inlet pipeline (or inside the tower)
My pump’s inlet flow rate is lower than the flow range of the pump selected; will this have any impact on the pump?
If the flow rate at the pump inlet is below the flow range of the selected pump, a return line must be used to ensure that the pump’s flow rate remains within the allowable range.