Insufficient flow at the pump outlet
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The pump’s inlet is connected to a vacuum tank; after the material is heated by a heater at the pump’s outlet, it returns to the vacuum tank. The vapor from the top of the vacuum tank then enters the distillation tower. Recently, I’ve noticed that the flow rate at the pump’s outlet is insufficient. When the outlet valve is opened wider, the pipeline vibrates, and there is no pressure indicated on the pressure gauge. The material inside consists of propylene glycol, salts, and water. No faults were found after removing the pump, but it still doesn’t deliver the required flow rate. Could anyone help me analyze this issue? Thank you. The desired flow rate is 500 tons per hour
Has the inlet filter been cleaned? Is the pump cavitating?
Is there a problem with the pump’s seal?
The problem might lie in the negative pressure level of the vacuum tank.
Check for changes in the pressure of the vacuum tank, as well as changes in the composition or boiling point of the material.
In this situation, there is no flow at the outlet; therefore, the pressure on the outlet pressure gauge certainly won’t rise. The pipes vibrate heavily, and cavitation occurs. Reducing the opening of the outlet valve should help improve the situation.
The filter was removed; I reduced the vacuum level, and the flow rate improved. Why?
What changes will occur if there is too much recombined component?
First, check the equipment – its integrity, the front-end filters, pipeline issues, and so on. Check the process after checking that.
If it is a centrifugal pump, by connecting the inlet to a vacuum tank, the pressure at the inlet of the centrifugal pump becomes negative; without backpressure, the pump cannot operate properly