Compressor pressure issue
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Our facility has a D-type compressor (with three stages of compression). The problem is that the compressor’s flow rate is fine, but the pressure at the third stage doesn’t increase – there is one piston ring for the first stage, one for the second stage, and two for the third stage. I was wondering if this could be a problem with the piston rings in the third stage Please ask an expert to help answer
Personally, I think if there’s a problem with the third-stage ring, it shouldn’t prevent pressure buildup; at most, the pressure on the second stage will increase until the safety valve activates, or it may exceed the allowable pressure range
By traffic you mentioned, are you referring to the level of traffic? Is there no issue with that? Your third stage is the final stage; under normal circumstances, no pressure is generated at this stage. Either the piston in the third stage does not perform any work, or there is a problem with the valve in that stage, or the valves in the circuit or the drain valves are leaking severely. If it’s due to the first two reasons, then it will be reflected in the display of your three-stage inlet pressure or two-stage outlet pressure ； If it’s due to the reasons mentioned later, then I suggest you check it carefully. If you can provide more detailed information, it will be easier to get answers from many sailors
The flow rate refers to the inlet flow rate of the compressor; this value is roughly the same as before. The only difference is that the pressure at the third stage is not as high as it used to be. I checked and found that the pressure at the second stage isn’t very high either, remaining within the normal range. If there were a problem with the third-stage component, the pressure at the second stage should increase. I suspect there might be a leak in the third stage, as there is an automatic valve behind it that controls the pressure there. It seems to me that the opening degree of this valve is greater than before, but the PLC shows values that are the same as before. Could there be a problem with the automatic valve?
You can determine whether there is internal leakage in the valve by checking the temperature of the pipeline downstream of the valve
The key is that the automatic valve behind stage 3 must be opened; this valve is used to control the pressure at stage 3. Due to inappropriate selection at the time, the valve can no longer be closed further once it is opened to a relatively small degree – if it is closed completely, there will be no gas flowing in the subsequent stages
If the second-stage pressure remains unaffected and the inlet flow rate does not change, the most likely explanation is an increase in internal leakage within the valve, which leads to a drop in the pressure at the third-stage outlet.
I think so too; if there’s a problem with the third-stage ring, the pressure in the second stage will increase, which causes some headaches. It’s possible that the zero point of the automatic valve has shifted, and there might also be leaks in the third stage later on
There is a problem with the third-stage ring or valve; the second-stage pressure will definitely be displayed. The fact that the third-stage pressure has decreased indicates that pressure is being released after the third-stage outlet.
Hmm, I see. Thank you for your analysis
Is it the pipeline pressure after stage three? The pressure of the piston machine has nothing to do with the machine itself; it depends on the gas used at the downstream end and the pipe resistance.