We are using some field used parts as an adapter for a test part. Some parts were sent out to be heat treated to a higher hardness and some are being used as is.
My question is does the heat treatment process in any way reset or undo any fatigue damage that may have been done to the part? Say...
yes it is. And yes, ideally it should have been a closed pressurized tank. There was not nearly enough coordination between the chiller manufacturer, the HPU manufacturer, and myself. Lessons learned.
absolutely no problem! I always do my best to post a resolution. I always hate when I come...
Wow I have missed a lot of responses. I'm sorry, things got busy and two other projects took primary focus. I will do the best I can to respond and catch up,
So we did try manually closing the butterfly valve before the pump was turned off and the water hammer issue stopped. Tested several...
Okay, thank you very much! I apologize, I did not think it would be considered a double post since I posted in two completely different areas and figured a wider range of people would see and hopefully respond. I apologize and will refrain from doing so again.
Hello, could anyone point me in the right direction to find stress-strain, stress-life, and strain-life curves that could be used to build a materials database in Ansys? I have tried several times searching Google and have come up with very few results that I can turn into a materials database...
Hello, could anyone point me in the right direction to find stress-strain, stress-life, and strain-life curves that could be used to build a materials database in Ansys? I have tried several times searching Google and have come up with very few results that I can turn into a materials database...
Littleinch and Katmar, thank you both very much for your valuable input! I really appreciate the assistance understanding what is going on in this system.
Yes, I was thinking of the piping as a closed loop, but I suppose I was incorrect to say the system was closed loop since the tank is indeed...
Yes, the pump turns off at the same time the valve starts to close, so the pump is off for about 10 seconds before the valve becomes fully closed.
So it sounds like you are saying the height of the riser is enough for there to be a low enough pressure at the top to boil off some fluid and...
I apologize, the first post was incorrect. I don't know what I was thinking. I have corrected it.
The valve is closed when the pump starts. It begins to open when the pump starts and takes approx. 10 seconds to fully open. The shock occurs when the pump starts and the valve is still closed.
I...
Hey electricpete, thank you very much for the detailed response! I apologize it has taken me so long to respond.
So the sensors on these motors are vibration sensors reading in in/sec from 3-1000Hz. The manufacturer recommended trip setting is 0.15in/sec RMS (which I also thought sounded low...
Total fluid volume is about 500gal and the tank volume is 100gal. That may have been a detail I left out, the inlet and the outlet of the chiller is very near the floor. Inside the chiller unit, the pump of course siphons from the bottom of the tank and the return enters the tank approximately...
I am struggling to figure out if a closed loop pipe system could drain all or even some of the fluid out of the pipe back into the reservoir after the pump shuts off.
Fluid is 50/50 propolene glycol / water. The system is a chiller fluid system. The reservoir is a vented tank. The pump pulls...
Strong,
Thanks for replying! I apologize I did not word that very clearly. I meant if the PLC is logging it then there is a signal that we could connect the data acquisition system to and record the data, then do the FFT. My apologies.
@GregLocock I do not believe so. There are no current transformers installed that I am aware of. If there are, they are most likely internal to the motor controller and we would not be able to access those.
EDIT: actually maybe, I do remember seeing current on the hmi screen so if the PLC is...
Trying to diagnose some vibration issues here in a large 8,600hp VFD driven electric motor. Bearings are pressurized oil journal bearings. Directly coupled to another motor to apply a load, so no gear mesh frequencies or blade pass frequencies possible here. Frame is rigidly bolted to a stong...
