Filler air leakage
Thread Content
My company’s two-stage reciprocating compressors have air leakage at the seal gaskets between the second-stage cylinder and the intermediate housing. Even after replacing the seal rings, the leakage persists. When nitrogen protection is enabled, air also leaks from between the piston rod and the pressure plate. What could be the cause of this?
Is there a problem with the packing seal? Is the air leakage within the acceptable range?
Send a video to see what the structure looks like.
Oh, was the filler installed in the wrong direction? . . .
We have seven packing boxes; according to the specifications, they should be of type B and type C. The first five are of type B, while the last two are of type C. Let me explain – see if there are any issues: starting from the side closest to the pressure measurement, there is the radial ring, then the tangential ring, and finally the flow-blocking ring. This is the configuration for type B. Since we use nitrogen sealing, the arrangements for the last two positions are symmetric. That is, for type B, it’s tangential ring, wedge ring, radial ring; whereas for the last group, it’s radial ring, wedge ring, tangential ring. I paid close attention to any rough edges during installation, and nothing seemed to be wrong
There is a principle behind the location where the sealing ring is installed; it is merely a suggestion for reference.
If the filler is fine, check whether the piston rod is worn
Is it possible for the piston rod to oscillate excessively?
In my opinion, there are several reasons: 1. The piston rod exhibits excessive vibration, which is caused by severe wear of the piston rings; this can be preliminarily determined from the compressor’s air delivery volume； 2. If the filler is installed too loosely, tightening measures can be taken ； 3. There are issues with the quality of the filler ； 4. Defects on the surface of the piston rod ； 5. The compression ratio is too high; in other words, the spring stiffness of the outlet valve is too strong, or alternatively, the outlet pressure is high ； 6. During multi-stage compression, internal leakage in the outlet valve of the current stage and the inlet valve of the next stage causes the pressure from the next stage to enter the cylinder of the current stage, resulting in an increase in pressure within that cylinder ； Personal opinion!