Further to previous reports on the compressor slide valve - I have managed to clear the position gauge glass enough to see movement. The valve moves between approximately zero and 42%. It is only when the value reaches 42% that the broadband vibration (accel up to 10kHz) and noise can heard. Is...
Sms, thanks for the post.
Could you, or others, confirm what a problem with the slide valve would actually involve in terms of the process etc, and therefore mechanical concequences of slide not moving? I would like to clarify this before suggesting remedial action. Cheers.
If you can collect vibration measurements up to 1000Hz (Velocity), these readings can be compared against MTD guidelines for pipework. If these spectra do not exceed these guidelines it can be said that the measured point is good for up to e.g. 1x10^6 cycles. Should they exceed these guidelines...
Skip,
I can confirm that the data is collected using a epoxy-resin attached stud and accelerometer with a linear range up to 10kHz. This covers multiples of mesh on this unit. The positions at DE are as close to bearing locations as I can acertain from the drawings.
I have actually noted...
Rob, Thanks for your response, unfortunately I have followed this method in the past, and when the client decided that intrusive maintenance was required. The bearings and screws were found to be worn. There is also currently an issue with the slide valve, which seems to be stuck at 40%...I am...
Further to previous, it should be noted that overall vibration levels rarely exceed 1g rms. Velocity readings in all directions <4mm/s rms with levels higher in horizontal direction (as would be expected)
I am currently looking at the vibration monitoring on a couple of gas screw compressors, with a 5/7 ratio. There have been a number of problems with these units in the past, where instrusive maintenance has revealed worn screws and bearings. Very little of which has shown up in the vibration...
