Drawoh:
yes, if you see the original picture, you'll see that the bolts touch the base plate frame and go through the vibration pads. However, an analysis of the noise in the apartment indicates vane pass freqeuncy of the pump (5 vanes * 3500 RPM /60) = 291Hz is most prevelant. We are looking...
Tmoose:
The piping up the flex joint was the only change to the piping.
Walt:
The flex connector is before the first ceiling hanger, but there is a small vertical support from the foundation to the pipe before the Flex connector (Labeled as "rigid mount" in the picture). I agree that adding...
Walt,
The Pump guy (I've down graded him from Engineer) did say the pump was running at 3600rpm, so perhaps a Vane Pass frequency of 5x3550 makes sense.
What conclusion would one draw from this? Should we be looking to altering the impeller? perhaps the vane angle or to a staggered vane?
Walt,
I don't have the pump info yet - it will take me a little time to get it. I did manage to record the noise. Toward the end of the recording you'll hear the pump wind down as it's being shutoff. Let me know if the recording is clean enough to run FFT on it.
thanks again for all your help...
Let me try to answer several posts/questions here:
The vibration pads are new and I don't think where properly selected based on the loaded/operating weight of the pump. But again, my thinking is that vibration pads are used to reduce noise/vibrations from getting into the supporting structure...
Walt,
you are correct about the label being mixed up. My apologies. But back to my question, should we have isolation pads under the pump if our primary concern is noise/vibration transmission to the roof tank supply?
Folks,
I am working with my building management to resolve a recent issue with the building rooftop water tank refill pipe transmitting a very audible humming noise to an apartment in the building. The pump is located in the basement and tank feed pipes run directly under the 1st floor...
