Regular vibrating noise from the tower’s return pipeline

Give it a push; wait for a strong responder. Another question: Do you mean the pipeline from the pump outlet to the tower by \"return pipeline\"?

This is a typical example of a situation where the vibration frequency of the equipment has not been studied. It is usually necessary to calculate the oscillation frequencies of the equipment and pipes in order to avoid resonance; otherwise, a lack of stress analysis may lead to lateral displacement of the equipment’s pipe ends due to uneven heating, resulting in leaks. The solution is to change the position of the top support of the tower, or to add more supports. . .

This phenomenon can be considered from several aspects: 1. Whether there is a return tank and whether the liquid level in that tank meets the requirements of the pump’s operation; 2. Whether the capacity of the return pump is too high, and if so, the outlet valve should be adjusted accordingly until the required load is met. 3. Is the outlet pressure of the pump too high? 4. Is the spray nozzle of the reflux line in the tower blocked? Did poor export performance cause the fluctuations? 5. Is the error between the pump outlet pressure and the tower pressure too small?

Is the pipeline after the pump outlet vibrating continuously? If that’s the case, the simplest solution is to reinforce the pump outlet pipeline by using a fixing bracket to secure it in place.

Thank you all for your advice. I’ll start by trying the adjustments as suggested on floor 4, but what was said on floor 3 is also correct – we’re all amateurs here. To save money, the boss hired a subpar design firm, and the construction team has been assigned multiple times, resulting in poor construction quality; it’s likely due to stress issues. I’ll reply after the experiment is done; in the meantime, I need some guidance from experts.

We have checked the pressure of the pump as well as the pipelines one after another to ensure there are no issues, but the problem still persists. Now the only option is to add more pipe clamps and see if that helps

Check the pressure fluctuations and trends in the return line to see if they are associated with vibration. Additionally, when checking the vibration levels of the pump and tower under operational conditions, it is important to note that the vibrations are generally not caused by external vibrations transmitted through the fluid. It is necessary to ensure that the pipelines remain unobstructed, that pressure remains stable, and that the pump operates smoothly; merely adding supports is not a sufficient solution.

The addition of pipe clamps did help to some extent, but the vibration phenomenon did not disappear. Moreover, the valve flanges on the side closer to the tower experience more severe vibration than those on the side further away from it. Does this indicate that the vibration originates from within the tower, such as due to loose spray pipes? Also, in the topic I initiated, there is regular vibration in the outlet pipeline on the side of the tower; the vibration comes from the gaskets of the side-line valves, and it continues even after the connections are tightened. I think it might be due to poor flow in the pipeline or steam from the casing causing some of the oil to vaporize, thus creating an air blockage. I’d like to hear from someone more experienced.

It is possible that the pump’s head is too high, resulting in a large pressure drop across the valve in the return line； It’s also possible that the flow rate in the pipeline is too high ； If it is a saturated reflux liquid, a small amount of liquid may still vaporize, causing vibration. Solution: Place the control valve near the reflux inlet of the tower ； Select the appropriate pump ； Reduce the flow rate of the pipeline.

Today, I’m discussing this issue with you once again. Through observation and experimentation, it has been found that as the pressure drop in the tower increases – which corresponds to an increase in the backflow rate – the vibration in the tower’s backflow piping becomes more intense. A few days ago, the gasket connected to the tower flange broke due to vibration, and the gasket on the valve gland also leaked as a result of vibration. Today I removed the manhole on the tower and took down the spray pipe; I found that the pipe was very clean. After measurement, the spray hole diameter is 24 mm, with a total of 20 holes. Based on a flow rate of 1.5 m/s, the volume is approximately 48 m³/h; the recirculation rate for the tower is designed to be **48 m³/h. Could this be due to oversized orifices causing air hammer in the pipes? I am eagerly awaiting everyone's responses. 2009-8-14