Activity

Reply by John from PA

Think of crest factor as an indicator of how "spiky" the signal may be. As such it can be an important parameter in signals that have...
John from PA

Reply by TLNTX

As of May 18, 2019 the project has been canceled and will be rescheduled for a later date in the year. Thanks for looking and...
TLNTX

Reply by TLNTX

John, as promised, here is a photo of what would need balanced over in Saudi. Easy balance job, single plane, rotates at 350 rpm.Takes...
TLNTX

Reply by TLNTX

John, we are looking for someone who can do field balancing. Either a person or company over in Saudi or someone traveling from another...
TLNTX

Reply by John from PA

Are you seeking services of a firm with balancing machines (Schenck, etc.) or the ability to field balance a shaft in-situ?
John from PA

Reply by NickTruck

Thank you M. Al-Shurafa for your reply which is very instructive. My question was indeed very general. I am going to submit the details...

Reply by pal

please make an bubble chart as shown below to fix the resonance.the below chart is showing only pump and motor but you please include...

Reply by Nagaraja

Replying to Ron, Attached is the photograph showing the direction of measurements (Sensor mounted) and also DVA position. I made 2 guys...

Reply by Ron Stiemsma

Below is what I call directions. When you say vertical I think up and down. Your DVA looks like it will only help the Horz 90- degrees...
Ron Stiemsma

Reply by aziz58

On line monitoring set the lower frequency at 10hz.does it correct setting when we have rotatating ring at below 10hz. On the other hand...

Reply by aziz58

Type of gear is vorecon voith gear box. As you find attachment ,the in put is ring gear and the out put is sun gear. So that is non of...

Reply by Shurafa

A general answer for a general question. Create a model for the system and assign the availability of each element to calculate the...
Shurafa

Reply by aziz58

thats right jhon.as you say the ratio fall out side. may i mistake so the gear should be star type.but according to sensor list that say...

Reply by Nagaraja

Replying to Ron and Walt As shown in the photograph the motor is in vertical direction sitting on the stool at the bottom, yes right now...

Reply by Nurudin

Hi RELI, Your existing oil (2nd) is classified as ASTM type II oil, which having extra additive for Geared Turbine (EP) and additional...
Nurudin

Reply by Walt Strong

" Just a last question to Walt... if I tune the DVA to 16.9 Hz it will vibrate more violently along with Motor which is 3.5 ton weight.

Reply by Ron Stiemsma

Still have questions. In the first post you say you are trying to address vibration in the vertical direction and the motor is in an...
Ron Stiemsma

Reply by dominich.vo

Thanks Dave for material. the lubrication is just follow the manufacturer and no any abnormal. The spec for oil is VG100, The oil was...
dominich.vo

Reply by Nagaraja

Just a last question to Walt... if I tune the DVA to 16.9 Hz it will vibrate more violently along with Motor which is 3.5 ton weight.

Reply by Nagaraja

Thanks members for all your valuable comments. Yes I have read electripete comments and all posts on DVA before I ventuted into this.

Reply by Dave Reynolds

https://www.machinerylubricati...ad/150/gear-failures https://www.rexnord.com/conten...ments/108-010_manual Here are a couple of links...

Reply by John from PA

Tuned absorbers have been well discussed here for quite some time. You might want to go to the thread at...
John from PA

Reply by Walt Strong

What are the natural frequencies in the horizontal and vertical directions (in horizontal plane) when impact-response is at/near top of...

Reply by Ron Stiemsma

Calcs look good. (this gets you in the ballpark) When you say highest vibs are in the vertical are you saying the highest vibs are in...
Ron Stiemsma

Reply by Nagaraja

Thanks again. I fixed up the DVA along max excitation. In this case vibs were high along vertical 13 mm/sec and hence I fixed up in that...

Reply by William_C._Foiles

From the initial post, I believe that you were using a tuned absorber per Fox. The concept is to design the absorber to have a natural...
William_C._Foiles

Reply by Raul Rios

I got this link on the web that I found interesting and I share it with you. What do you think? ...
Raul Rios

Reply by Nagaraja

Thanks William The bump test on DVA shows 12.5 Hz. Can u Pls elaborate what I need to do further. Will changing the DVA position help.

Reply by John from PA

Or call the OEM. In my experience you are more likely to find the total motor weight in catalogs etc. and perhaps the rotor inertia for...
John from PA

Reply by Sledder

More than likely that won't be listed anywhere.. You need to weigh it.

Reply by William_C._Foiles

When you tune the vibration absorber and bump it. One expects a dip at the running speed (or frequency of interest), not a peak. Excite...
William_C._Foiles

Reply by Kishore kumar

Dear DOMINICH.VO , increased noise floor with gear impact indication , are you maintaining and changing its lubrication as per the...
Kishore kumar

Reply by dominich.vo

Dear Mr. Kishore Kumar, Please have a look in spectrum. Some information that this pump is running with low viscosity compared with the...
dominich.vo

Reply by Kishore kumar

Dear DOMINICH.VO , it might be damaged due to operated under Misalignment or from assembly errors .If you have any Vibration spectrum ,...
Kishore kumar

Reply by Walt Strong

Re: MCSA
A clamp-on current transformer needs to have a voltage output with good frequency response. I use an inexpensive Fluke clamp-on (now...

Reply by Lampard Nguyen

Re: MCSA
Hi Masood, Yes. You can use VibXpert II for MCSA testing and analyzing. However, it will be better if you have CSA tool for evaluating...
Lampard Nguyen
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