Regarding the pump 23+53B scheme: the sealing circulation issue of 23
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Has anyone encountered this situation? The medium is diesel; the normal temperature is 340°C. Currently, cold oil circulation is in use, with a temperature of 50–60°C. The pressure rating of the first-stage seal is 23. It has been observed that the temperature of the medium outlet pipe is low, while the temperature of the medium inlet pipe (near the seal) is high. After checking the pipes, it was found that neither the inlet nor the outlet was blocked, nor was the seal outlet blocked. The cooler also showed no signs of blockage. Normally, liquid is discharged during exhaust; as exhaust occurs, the seal inlet pipe gradually warms up (the area from the cooler to the seal inlet becomes warm, while the outlet pipe remains cool). This issue persists even after replacing the seal.
Hello, since the temperature of your medium is too high, using a heat exchanger is no longer useful! The reason is that as long as the medium flows out of the sealed chamber, its temperature drops due to heat transfer (as the air temperature is low); it further decreases after passing through the heat exchanger. When it returns to the mechanical seal, the temperature in the sealed chamber is very high, and as a result of heat transfer, the temperature of the medium at the inlet increases. Generally speaking, heat exchangers are not recommended for media at 250°C, as the heat exchange efficiency is not good! For this temperature, I still recommend using PLAN32+53B~~
The current oil temperature is very low, with a significant difference from the normal temperature (normal being over 300, while it’s currently 50-60). However, this issue does not occur with another pump of the same model
I took the old seal apart to check it, and there was no problem. I replaced it with a new one, but the same issue persisted
So, 23 is used; 21 is not utilized. It’s only used to cool the liquid inside the seal, and the flow rate is low. At present, we are using cold oil, so the temperature isn’t very high – around 50-60°C. For model 32, an external flushing medium is required, while the medium pumped by my pump is diesel
Your flow rate is not high, so the heat transfer in the pump casing heats up the flushing fluid~ That’s why either 21 or 23 doesn’t matter!
But my current temperature isn’t high; the other pump with the same model doesn’t have this problem
Do you mean that the 23 medium outlet pipeline is the pipeline for the inlet seal of the cooler? Is the medium inlet pipeline the pipeline from the mechanical seal to the cooler? Could this ambiguity in understanding be clarified?
We are using a 23+53B configuration; therefore, the BI and BO holes of the mechanical seal are fed with 53B white oil. The circulating fluid for the primary seal, which is 23B, is drawn out through a hole in the pump cover, cooled in a cooler, and then returned to the mechanical seal. However, the hole in the pump cover leads directly to the mechanical seal itself, not to the side where the medium flows. The current situation is that the temperature of the pipeline leading from the pump cover to the cooler is low, while the temperature of the pipeline returning from the cooler to the seal is high