Recent content by ArnoVonck

No we don't get rated static pressure. Indeed, it's going to a scrubber.

The 3rd of May we'll do another run-up test. I'll do as you said in Post #27

I'm sorry for the late answer. I've been on a holiday. I've went and took some pictures of the entire unit to maybe get you a better idea.

The fan has been balanced out by adding some weights to the impellers. This has been done when I wasn't on internship here yet. When I looked at the fan spinning without media through it, it seemed these weights were actually Off-balancing the impeller. I'm thinking about taking the weights off...

I shared some links to these video's in a reply above Here they are

We've actually done a new vibration measurement on the entire motor-fan unit, on many different measurement points etc.. I'm still awaiting these results but these should be in by monday. Btw: The diagonal bars you see from motor base to snail house, together with the vertical bars from motor...

Yes the impeller has been replaced with a completely new one. Both have been balanced, statically and dynamically. I'm kind of rethinking the weights on the impeller to balance it out though. I might take them off and do a run-up again. The fluid being transferred is NaOH dissolved in water...

We first replaced the bearings with non-conductive bearings. Then we replaced the entirety of the motor. So the motor/bearings aren't the problem.

Does the document attached suffice?

I can see the confusion here. The NaOH flowing through is dissolved in water.

Yes the speed is being controlled by a VFD. The VFD responds to the PIC as you can see in the document I added (the problem fan is the one called 813-F11) No, there's actually NaOH flowing through. Not air.

What do you mean by controlled? We want to control the flow of NaOH going through.

I'm not a native English speaker, don't mind my weird expressions. I uploaded the video's to youtube, but they are confidential to IMEC, so you can only access them through these links. The nominal flow of this fan is 20 000 m³/h. I'm looking for the static pressure and fan curve, I'll upload...

It pushes media into a duct yes. The media is NaOH. We've actually separated the duct once and let it rotate freely. The system still goes into resonance. It's a centrifugal fan (radial) with backward curve impeller type. I actually don't know the amount of blades and I can't find it in the...

Thank you, jrmichler! Exactly, the fan spins at 1086 RPM. - Yes, 1086 RPM at 36,2 Hz drive frequency. - I don't think these are pneumatic vibrations. I think it's a mechanical issue. Motor and fan are as it were, moving 'into' eachother whilst vibrating. - The main resonance frequency of the...