The liquid chlorine magnetic pump fails to deliver flow
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The liquid chlorine magnetic pump does not deliver flow when started recently; it only starts to deliver flow occasionally after being turned on once. Under normal circumstances, it needs to be turned on more than twice, or even a dozen times or so, before flow is achieved. The feed pipeline is fine, and the exhaust from the pump’s exhaust pipe is thorough enough. But as long as the flow rate is not high, the sound the pump makes when it starts up is clearly abnormal, with a distinct \"thud\" sound. When the flow rate is low, there is no change or fluctuation in the pump outlet pressure. It seems like the motor is rotating, but the lower impeller part isn’t moving.
Was the pump filled before starting it? What specific type of pump is it? A standard horizontal magnetic centrifugal pump or a vertical one? Or in other forms?
It is necessary to have the pump filled with liquid before starting it; it is a vertical magnetic chlorine pump from Dalian Kehuan.
Check if your pump inlet filter is clogged! ! ! ! ! ! ! ! ! ! ! ! ! ! !
It’s not clogged, and the pump operates smoothly. . . . . . . .
Liquid chlorine has a low boiling point; it seems there might be air blockages in the pipes. It takes longer to fill the pump, and since it’s a liquid that vaporizes easily, I’m not sure whether a magnetic pump would be suitable for use
Analysis of reasons for insufficient output: 1. It is caused by mechanical failures, such as problems with the motor or the pump; this issue is easy to resolve. 2. The positive net head is insufficient, or in other words, the cavitation margin of the device is not enough, which causes liquid chlorine to vaporize at the pump’s inlet; as a result, the pump is unable to deliver fluid. One can try reducing the outlet valve to control the flow rate, or increase the inlet liquid level or inlet pressure. 3. The inlet pipeline is blocked, or there are problems with the filter or valves, resulting in insufficient liquid flow into the inlet. This fails to meet the requirements, causing the pump chamber to be filled with vaporized medium and leading to the impeller spinning idly. 4. The inlet piping is improperly designed, resulting in high suction resistance or air blockage due to the presence of air pockets at higher points. Start the pump following the correct procedure: first open the inlet valve, slightly open the outlet valve, or activate the exhaust line to fill the pump chamber with liquid. Before starting the pump, fully close the outlet valve, then start the pump and check whether the outlet pressure remains stable. If it is stable, gradually open the outlet valve to adjust it to the rated flow rate. If there are sudden large fluctuations in pressure or a return to zero during this process, it indicates a problem at the inlet – either there is a blockage, high suction resistance, or insufficient net positive suction head. It is mainly determined based on the performance of the pump; there are dedicated posts explaining the symptoms of phenomena such as cavitation and blockage.
It is clearly caused by the vaporization of liquid ammonia.
How long has the pump been running? Has the magnetic drive area been checked?
It wasn’t checked; I contacted the pump manufacturer by phone, and they said it’s not a problem with magnetic drive.
Whether it is due to inlet piping, cavitation, incomplete exhaust, blockage, or gas issues, once the problems with the motor and transmission components have been ruled out, it is presumed that the main cause lies at the impeller, resulting from the presence of gas.