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 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

CRITERIA FOR SELECTION OF VARIOUS TYPES OF VIBRATION PICK UP

ACCELEROMETER FOR HIGH FREQUENCY RANGE

BEST SUITED FOR 1000 HZ ONWARDS

UNITS OF VIBRATION

(A) DISPLACEMENTMICRONS, PEAK TO PEAKMICRONS, 0 TO PEAKMICRONS, RMS

(B) VELOCITYMM/SEC, 0 TO PEAKMM/SEC, RMS

(C)ACCELERATIONM/SEC2, PEAKM/SEC2, RMSG, PEAKG, RMS

Average RMS 0 - Peak

Peak - Peak

UNITS OF VIBRATION

RMS = 0.707 x (0-Peak)Average = 0.637 x (0-Peak)Peak to Peak = 2 x (0-Peak)

SHAFT ORBIT

X

Y

Proximity Probes

INSTRUMENTS FOR VIBRATION MEASUREMENT

VIBROMETER

VIBRATION ANALYSER

FFT ANALYSER

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

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

TIPS FOR MAKING VIBRATION DATA MORE USEFUL FOR ANALYSIS

FOR CORRECT TRENDING OF VIBRATION READINGS, SAME

LOCATION SHOULD BE USED FOR ALL PERIODIC

MEASUREMENTS

REASONS OF VIBRATION IF THE MEASUREMENT IS HEALTHY, FOLLOWING MAY BE THE

REASONS OF VIBRATION PROBLEMUNBALANCE

MISALIGNMENT

LOOSENESS

PIPE PULLS

SHAFT CATENARY / BEARING LOADING

RESONANCE

UNEQUAL FLOW PATH CLEARANCES

RUBBING

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

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

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

KNOW YOUR MACHINES

KNOWLEDGE OF BEHAVIOUR FOR SIMILAR TYPE OF MACHINES

VIBRATION PRONE AREAS

INFLUENCE OF PARTICULAR OPERATING PARAMETER

INTERNATIONAL STANDARDS ON VIBRATION

ISO 10816 BEARING VIBRATION

ISO 7919 SHAFT VIBRATION

THERE ARE THREE LIMITS IN INTERNATIONAL STANDARDSLIMITS FOR NEW MACHINES

ALARM LIMITS

TRIP LIMITS

RECOMMENDED LOCATIONS OF VIBRATION MEASUREMENTS

ON BEARINGS AS PER ISO

OR

Measuring

Amplifier

45O 45O

PROXIMITY PICK-UP

L RSHAFT

Measuring

Amplifier

VERTICAL

HORIZONTALL R

SHAFT

RECOMMENDED LOCATIONS OF SHAFT VIBRATION

MEASUREMENTS AS PER ISO

THANK YOU