Recent content by jjr1111

Thanks for the responses, the "reduced speed" spectra was a error on my part.. I collected two sets of readings at full speed and one at a reduced speed for acceleration and velocity. I uploaded both of the full speed readings and omitted the reduced speed reading by accident. As an update it...

I'll stick to one forum going forward, but to respond to both comments, it's a lobe style pump. A Waukesha Cherry Burrell Universal 2 series pump. I'm not sure I understand what "it needs an acceleration factor specific to the pump type" means? The fluid is run through a heat exchanger so...

Thanks for the feedback on the slack and bearing condition, I'll read through the IOM and get familiar with what that process to check for slack entails.

reduced speed acceleration datahttps://files.engineering.com/getfile.aspx?folder=9cc75a2b-3d4a-4edf-9501-7da2310d9838&file=acceleration_reduced_speed.JPG

reduced speed vibration motor datahttps://files.engineering.com/getfile.aspx?folder=296cd825-1eca-4c7d-b92b-6ca5b9952ea1&file=velocity_reduced_speed.JPG

Accelerationhttps://files.engineering.com/getfile.aspx?folder=6568a7ca-820e-4a63-8b63-293dfcadfd8f&file=acceleration_100%.JPG

Hey Heaviside, operating the pump at full speed gave the initial velocity and acceleration reading I posted, but it also runs at reduced speeds for short periods of time, when at these reduced speeds, the vibration is significantly reduced. I was able to capture pump vibration and acceleration...

Pic attached up the setuphttps://files.engineering.com/getfile.aspx?folder=fd6eebaa-2abb-47e2-a059-b71170aab6ac&file=pump_gb_motor.JPG

Have a filtering system that is experiencing vibrations and was posting for into in the vibration forum, but and wondering if it could be related to piping system design so wanted to post up here too. The setup is a PD pump that pumps fluid from a tank through a filter and returns to the...

So had a look at the pump this morning, it is mounted as it calls out in the manual. Both the pump and gearbox are mounted to the plate, the motor is directly mounted to the gearbox. The motor around 1350rpm, and is gear box reduced to around 347rpm. One thing I'm not sure on is the pump has...

Thanks for the feedback, I wish I would have taken a picture of the gearbox, it might have been mounted to the plate in addition to the pump. I know for a fact the motor was not mounted and just resting on jack screws, but I'm starting to think maybe the gearbox was mounted to the plate too...

When converting assumed RMS to pk-pk now get the attached, not sure what to make of this. Probalby just need to go back and remeasure and look at the frequency data..https://files.engineering.com/getfile.aspx?folder=13356998-f2d2-4743-8f75-f55ba816cfdf&file=calc.JPG

When I put the velocity and acceleration data info into the calculator for the pump (1.02 in/s and .385g) I get 23.19 Hz, which is 1391rpm, and that is close to 4X pump speed so that does make sense that what I'm seeing is pulsations from the pump assuming that you do get 4 pulsations per...

Interesting calculator, definately helps show how velocity and acceleration are related to frequency. The mfg info for this positive displacement pump states it's is a rotary pump using a circumferential piston operating principle. Here's the Link. to the type of pump I'll have to double...

Oh, thanks for the info, I learned something new. Talking with others here we don't use pulsation dampers because it's on a sterile system and there's concerns for contamination, so safe to say that the prior application didn't have one either. I'll reach out to the pump MFG and see what's...