METSO A413313 Valmet Module

Typical application template structure

Typical calculated characters vs faults

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Monitoredphenomena Character

ISO/DIN machinevibration severity (load,

stress)

Vibrationvelocity rms, from frequency range 10

Hz –1 kHz

Faultscreating high frequency vibration or

impacts , like;-Rolling element bearing fault-Lack of lubrication-Cavitation

Coupling fault

Rolling element bearing fault impulses

Vibrationacceleration rms frequency range  1

kHz -10 kHz

Envelope signal peak and FFT rms

Acceleration peak value

Vibration velocity rms

Frequency range  5-20xrpm  (rotation

frequency)

Unbalance and alignment Vibration velocity rms

1xrpm + 2xrpm

Gearbox faults Vibration velocity  in gear mesh frequency

Detailed diagnostic Signal, FFT, envelope signal and FFT, STA

analysis

Valmet DNA Operate, to see total view

Mix trends (vibrations, process parameters)

Condition monitoring results and process

data can be viewed  and analysed in same

trends using DNA history tools

This will enable maintenance engineer to

simultaneous viewing of vibrations and

related process values in the same trends

This can be very valuable to optimize

machine operation, think about cases like;

Fan vibration versus motor power or air

flow

BFP vibration versus steam / casing heat

up curve (changes in case shape)

Pump vibrations versus pump pressure /

water flow etc

Vector storing principle

To have good history without excess load into database =data

management in SQL database

Vectors (signal, spectra and equal) are stored in 3 levels– Short history– Medium history (vectors removed from short history based on delta-time between

them)– Long history (again removing based on delta-time)– Does not effect to vectors stored by ”alarm” or ”user” or  from TG run-up/coasts-down

stage (these have their own history piles

Adaptive alarm limit handling application (”IAH)

What it means

”Standard” alarm limit handling has been to use fixed warning (H or L) and

alarm (HH or LL) limits for vibration values

Adaptive handling brings the possibility to adapt alarm limits into changes in

operating conditions, typically;– Machine speed  (m/min) / rotating frequency (Hz)– Machine load

A separate application to tune the limits after system /machine / productions

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