Labyrinth compressor pressure holding
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The labyrinth compressor fails to maintain pressure; when the compressor is not running, the pressure cannot be retained! The external pressure holding is fine, but once connected to the compressor, the pressure drops rapidly! Subsequently, blind plates were installed on the safety valve and the bypass line, but it was not effective! It’s not clear which part is faulty at the moment; the airtightness around the compressor is fine! May I ask where the external leaks of a compressor can occur? ! ! reward_7ree
Which factory are you from? Has the equipment been in use?
It should be a labyrinth seal; the possibility of leakage from a dry gas seal is low
But where does the escaped air go? A leak check was performed on site with no leaks found, and the venting system either became completely blocked or both valves closed shut! So where does all that worry go?
The last edit to this post was made by xueran on 2015-12-15 at 21:26. Pressure is leaking from the shaft; the labyrinth seal cannot maintain pressure. Check whether there are any leaks at the exhaust points of the labyrinth seal
Could you be more specific? I checked the side cover of the compressor and found no leaks. Which part of the shaft do you mean? I’ll send you a few pictures later; please give me some advice then
We keep it running; when the pressure drops, we add ethylene. Generally, the pressure decreases by about 3 kPa per hour
A labyrinth seal relies on labyrinth-sealed bearings; when the compressor is in operation, the pressure on the shaft side is high, leading to leakage outward. The design of the labyrinth seal structure helps to reduce this outward leakage. In our case, it’s a three-chamber labyrinth seal, and an inert gas pressure is needed to hold back the outermost chamber. The mixed gas of process gas and inert gas is then discharged outward from another chamber. Without the support of inert gas, or if the pressure of the inert gas is lower than that on the process side, it simply won’t work
The shaft is supposed to pass through the cylinder block; it rotates during operation while the cylinder block remains stationary, which creates a gap between them； This gap will allow the high-pressure gas inside the cylinder to leak out, so we need to seal it in order to control the amount of leakage; common sealing methods include labyrinth seals, dry gas seals, floating ring seals, and mechanical seals ； What you’re referring to here is a labyrinth seal. After the machine stops, if there is pressure inside the cylinder, it will leak through this gap. Of course, if it involves hazardous substances, sealing gas will be used; I’m not sure if you have that in place, but even if you do, leakage can still occur ； There is also an explanation for 9 leaks.