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WELCOME

WELCOME. BASICS OF VIBRATION. VIBRATION. CHARACTERISTICS OF VIBRATION SIGNAL AMPLITUDE FREQUENCY PHASE ORBIT. TYPES OF VIBRATION PICK UP. PROXIMITY PROBE VELOCITY PICK UP ACCELEROMETER. CRITERIA FOR SELECTION OF VARIOUS TYPES OF VIBRATION PICK UP. PROXIMITY PROBE

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WELCOME

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  1. WELCOME

  2. BASICS OF VIBRATION

  3. VIBRATION CHARACTERISTICS OF VIBRATION SIGNAL • AMPLITUDE • FREQUENCY • PHASE • ORBIT

  4. TYPES OF VIBRATION PICK UP • PROXIMITY PROBE • VELOCITY PICK UP • ACCELEROMETER

  5. CRITERIA FOR SELECTION OF VARIOUS TYPES OF VIBRATION PICK UP PROXIMITY PROBE • SHAFT VIBRATION MEASUREMENT • KEY PHASER MARKER • SHAFT CENTRE LINE POSITION • BEST SUITED FOR 1 TO 500 HZ VELOCITY PICK UP • FOR BEARING AND STRUCTURAL VIBRATION • BEST SUITED FOR 10 TO 1000 HZ

  6. CRITERIA FOR SELECTION OF VARIOUS TYPES OF VIBRATION PICK UP ACCELEROMETER • FOR HIGH FREQUENCY RANGE • BEST SUITED FOR 1000 HZ ONWARDS

  7. UNITS OF VIBRATION (A) DISPLACEMENT • MICRONS, PEAK TO PEAK • MICRONS, 0 TO PEAK • MICRONS, RMS (B) VELOCITY • MM/SEC, 0 TO PEAK • MM/SEC, RMS (C)ACCELERATION • M/SEC2, PEAK • M/SEC2, RMS • G, PEAK • G, RMS

  8. UNITS OF VIBRATION RMS 0 - Peak Average Peak - Peak RMS = 0.707 x (0-Peak) Average = 0.637 x (0-Peak) Peak to Peak = 2 x (0-Peak)

  9. SHAFT ORBIT Y X Proximity Probes

  10. INSTRUMENTS FOR VIBRATION MEASUREMENT • VIBROMETER • VIBRATION ANALYSER • FFT ANALYSER

  11. TIPS FOR MAKING VIBRATION DATA MORE USEFUL FOR ANALYSIS • LOCATION OF VIBRATION PICK UPS TO BE INDICATED • LOCATION OF PHOTOCELL TO BE INDICATED • DIRECTION OF ROTATION SHOULD BE INDICATED • KEY PHASER MARK ON ROTOR POSITION TO BE INDICATED • AXIAL VIBRATION PHASE LOGGING MUST HAVE DIRECTION INDICATION • NAME OF VIBRATION ANLAYSER SHOULD BE INDICATED • VIBRATION UNITS TO BE INDICATED

  12. TIPS FOR MAKING VIBRATION DATA MORE USEFUL FOR ANALYSIS • WHILE GIVING CONTROL ROOM VALUES, SPECIFY THE VIBRATION UNITS AND LOCATION OF THE PICKUPS • VIBRATION MUST BE MEASURED BY PORTABLE VIBRATION METER NEAR CONTROL ROOM PICKUP FOR VARYING THE CORRECTNESS OF CONTROL ROOM MEASUREMENT • PICK UP SHOULD NOT BE MOUNTED LOOSE • BRACKET FOR EXTERNAL SHAFT VIBRATION PICKUP SHOULD BE STIFF ENOUGH NOT TO PRODUCE AMPLIFICATION / RESONANCE

  13. TIPS FOR MAKING VIBRATION DATA MORE USEFUL FOR ANALYSIS • FOR CORRECT TRENDING OF VIBRATION READINGS, SAME LOCATION SHOULD BE USED FOR ALL PERIODIC MEASUREMENTS

  14. REASONS OF VIBRATION IF THE MEASUREMENT IS HEALTHY, FOLLOWING MAY BE THE REASONS OF VIBRATION PROBLEM • UNBALANCE • MISALIGNMENT • LOOSENESS • PIPE PULLS • SHAFT CATENARY / BEARING LOADING • RESONANCE • UNEQUAL FLOW PATH CLEARANCES • RUBBING

  15. REASONS OF VIBRATION • SHAFT BOW • OIL / STEAM WHIRL • DEVIATED OPERATING PARAMETERS • DEFECTIVE BEARING / ASSEMBLY OF BEARING • VIBRATION TRANSMITTION FROM OTHER SOURCE • GEAR INACCURACIES • CASING DISTORSTION • CAVITATION

  16. STEPS FOR RESOLVING THE VIBRATION PROBLEM • ACCURATE MEASUREMENT OF VIBRATION DATA • COLLECTION OF OPERATING PARAMETERS • STUDY OF HISTORY OF VIBRATION BEHAVIOUR / OVERHAULING REPORTS / RECURRING PROBLEM FACED • INTERACTION WITH O&M PERSONNELS • COLLECTION OF DETAILED VIBRATION BEHAVIOUR AT VARIOUS CONDITIONS OF OPERATION LIKE NO LOAD RUN, RUN UP, RUN DOWN, WITH AND WITHOUT EXCITATION, PART AND FULL LOAD OPERATION ETC. • VIBRATION ANALYSIS TO NARROW DOWN THE REASONS OF HIGH VIBRATION

  17. STEPS FOR RESOLVING THE VIBRATION PROBLEM • FORMULATION OF ACTION PLAN (SHORT TERM / LONG TERM) • IMPLEMENTATION OF ACTION PLAN • RESPONSE OF MACHINE AFTER IMPLEMENTATION OF ACTION PLAN • FRESH VIBRATION ANALYSIS, IF THE PROBLEM PERSISTS • IMPLEMENTATION OF NEW ACTION PLAN THE CYCLE OF VIBRATION ANALYSIS AND IMPLEMENTATION OF ACTION PLAN CONTINUES TILL THE VIBRATION PROBLEM IS SATISFACTORILY RESOLVED

  18. KNOW YOUR MACHINES • KNOWLEDGE OF BEHAVIOUR FOR SIMILAR TYPE OF MACHINES • VIBRATION PRONE AREAS • INFLUENCE OF PARTICULAR OPERATING PARAMETER

  19. INTERNATIONAL STANDARDS ON VIBRATION • ISO 10816 BEARING VIBRATION • ISO 7919 SHAFT VIBRATION THERE ARE THREE LIMITS IN INTERNATIONAL STANDARDS • LIMITS FOR NEW MACHINES • ALARM LIMITS • TRIP LIMITS

  20. RECOMMENDED LOCATIONS OF VIBRATION MEASUREMENTS ON BEARINGS AS PER ISO

  21. RECOMMENDED LOCATIONS OF SHAFT VIBRATION MEASUREMENTS AS PER ISO Measuring Amplifier Measuring Amplifier PROXIMITY PICK-UP 45O 45O VERTICAL L R R OR L SHAFT SHAFT HORIZONTAL

  22. THANK YOU

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