The pressure at the outlet of the 32% NaOH transfer pump is normal, but there isn’t enough flow at the point of use. Could someone please help analyze this?
Thread Content
32% alkali solution transfer pump: flow rate of 90, head of 80. Outlet pipe diameter is 6 inches. There are three points of use, each branching off from the main pipe. The first and second usage points are located 600 meters after the exit, while the last usage point is at 700 meters. The height of these usage points is approximately 20 meters, and 30 cubic meters are required. Currently, the first usage point is not in use, while the second point is being used as a tank truck. When both the first and second usage points are shut down, a flow rate of 40 cubic meters can be maintained at the third usage point; however, when the valve at the second usage point is opened to allow a flow rate of 30 cubic meters, the flow rate at the third usage point drops to around 10 cubic meters. And when the third utility point is turned off, the second utility point is fully activated, yet the flow rate remains just over 40 cubic liters. Could some expert please help analyze what’s going on? Is it related to pipe resistance, or is it the case that the pump’s capacity is not sufficient to meet the demands of all three usage points, or two of them at the same time? Thank you. I’m a bit in a hurry; waiting for a reply.
The specific details aren’t explained in detail: 1) it’s important to ensure that the vertical height from the storage container to the pump inlet is sufficient; 2) things will improve if the back pressure of the storage container can be increased.
Currently, 1 is not in use; mainly 2 and 3 are being used. The outlets are at atmospheric pressure. What other data is needed? I’ll check that
The reservoir is at atmospheric pressure; there is no cavitation at present. The current liquid level is around 3 meters, which meets the requirements for inlet pressure
Has the process been verified? Are there valves in the inlet pipeline to control flow? Also, check whether the pump inlet filter is clogged, which could be causing insufficient flow.
The diameter of the inlet pipe is fine, but the inlet pipe is too long, resulting in high resistance at the inlet.
Your head loss is clearly too low. Under normal conditions, a head loss of 1 meter corresponds to a straight-line distance of 10 meters; with the additional resistance caused by elbows and valves, your head loss becomes very low
Agreed, pick a location and add a pipeline pump.
Could you help calculate it? I’ll check what data is needed. It’s a real challenge right now; I’m running out of resources day by day
It’s unlikely to add a pipeline pump; it mainly depends on certain criteria. If those criteria are met, I can add a pump to separate the various points
Don’t understand? ? ? ? ? ? ? ? ? ? ? ? ? ?