Dear All,
I am seeking for second hand / used vibration analyzer (route,analysis,balancing) If some one is willing to sale please email me at:zaqsaid@yahoo.com

Hello good people of the interwebs.  Hoping for some knowledge or bright ideas for a fan vibes diagnostics problem I'm struggling to resolve.

The equipment is a 950rpm fan belt-driven by an approx 1780rpm motor.  The fan/motor/support structure are spring-isolated. The fan is a double-wide, double-inlet squirrel cage style (axial intake, radially-up discharge).  The fan rotor has 3 bearings (DE, center, NDE) with the impellers between the center and NDE bearings.  Double row self-aligning ball bearings in pillow blocks.  SKF SNL 512-610 at the NDE and center, NSK SNN 511-609 at the DE.  Motor, fan sheave, fan shaft and (maybe) bearings recently installed. 

The primary issue is a high fan 2X, especially at the fan DE and center bearings.  Issue present and stable since post-mtce test.  It is directional at those positions - high in the horizontal and relatively low in the vertical and axial directions.  It is most directional at the center bearing.  The horizontal fan 2X is out-of-phase from DE-to-center and out-of-phase from center-to-NDE.  Seems like internal misalignment between the center and DE bearing to me but we haven't been able to find a smoking gun when inspecting the pillow blocks, their bearings and the alignment setup.  Made some minor adjustment with no improvement to vibe behavior.  There is some suspicion that belt tension is playing a role but still working through that idea...

Also of note, during coast down the 2X amplitude drops off rapidly (with no associated phase shift) from full speed (950rpm) to 800rpm.  Almost like a dynamic offset misalignment, only present at full speed.  The directionality and steep drop off during coast down motivated me to do an impact test of the center bearing in the horizontal.  Impact test results show low mobility and no phase shift at fan 2X, so resonance is not indicated. 

I attached a few slides that might help.  Any ideas or insights would be much appreciated!  Any questions, ask away!

Thanks,

Neil

Hello

I am trying to use the Adapter A 628a for balancing 2 planes but i note that the mag/phase for each measurement points have same value .

So the i have to use the adapter 648 mux for balancing job?

thanks

Hey Everyone,

I have a Vibscanner from pruftechnik.  I am looking for some clarity reguarding the balancing parameters.  In particular how to identify the shaft rotation with regard to the screen selection.  If anyone has experience with this data collector i would be greatfull for any help.

thanks in advance

Rob T.

Hi there.

Does anybody experienced failures of VL28 Gas seals in Ethane applications?

Thank you for a reply.

BR

Manfred

A 3000 RPM centrifugal fan is showing abnormal vibration readings. The vibration velocity readings vary between 20 mm/s to 350 mm/s.

The spectrum analysis is showing high amplitudes at sub harmonics of less than 1/3x frequencies.  Please refer attached screenshots. The time wave form of the vibrations is also attached.

The impeller is supported on a fan shaft in cantilever arrangement which is supported by 2 nos SKF 2212E cyclindrical bore self aligning ball-bearings. The fan is coupled to motor shaft through a Fenner pin-bush type flexible coupling. The impeller is balanced and alignment is done using laser alignment machine.

We are facing this issue since last 3 weeks and have still not identified the root cause of this issue. Any help/suggestions will be appreciated.

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What will be the effect on the mechanical seal, that installed in centrifugal pump, if the pump is running above the maximum suction and discharge pressure? Will high suction pressure increase the process flow through pump throat bush into the mechanical seal?

Vibxpert II machine sale.

  we purchased for one plant regular work purpose but unfortunately we lost the order .so planning to sell the equipment

vibration analysis with spectrum ,balancing,software 2 year license if you want external attachment length cable also available (new )  not yet used even one site also some cover not yet seal open.

Dear Experts,

We at our fertilizer plant is using Old ISO-2372 standard for casing vibrations limits. There is new standard ISO-10816 which replaces ISO2372, however, the team is of the view that old standard ISO2372 is more stringent.

Also, as we have old machines at our plant, stringent requirements will benefit in longer run to keep machines running at lower levels of vibrations and hence increase reliability.

Can anyone please tell me if our thinking is OK? Also what is the major difference between the two standards?

Regards.   

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Hi,

Just wanted to know your opinion on this case. I have detected what could might be a rotor bar issue on a newly installed vertical motor driving a pump. There are peaks and harmonics with sidebands around 2x LF in the spectrum we recently collected. I don't know the no. of bars but from textbook material I believed this is the rotor bar pass frequency. Should I worry? although the amplitude is very low and what are the telltale signs that it's really bad or not.

I was wondering about 2 points as stated below during shaft vibration measurement at the test bed.

Point 1: Why are the X&Y probes showing different values despite being in the same measurement plane configured 45deg to either side of the vertical plane? Below are the overall values for the picture attached (all are um PP).

• DEX: 38 (deviation compared to DEY is 12 microns)
• DEY: 26
• NDEX: 30
• NDEY: 33

Point 2: Why is the signal level high at low frequency for the first 2 plots (orange & green) referring to DE X&Y plots of the attached picture? whereas NDE X&Y are normal.

Kindly put some light to understand this. Your valuable response is appreciated.

Thank you

Regards

Jagadeesh

I have doubt about balancing shop floor site operating speed and testing speed Rpm

Because we calculate tolerance  ISO 1940 operating speed  1500 Rpm  but comparison of testing speed 250 Rpm  how to merge ?

Kindly support

Hello everyone

what type of (documents, certificates, ….) should demand from tenderer (Open Invitation to Tender) to avoid adamantly any deviation with API standard

thanks

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If anyone is interested, I have an as new Bently Nevada Snapshot iS, intrinsically safe complete kit in Pelican case. Touch Screen and works with System 1 software (not included). This is in perfect as new condition and includes all original accessories. This was a trade in for a VibXpert II system and was not used. Going at a very reasonable price.

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