methodical phase analysis
Post on 02-Jun-2018
232 Views
Preview:
TRANSCRIPT
-
8/11/2019 Methodical Phase Analysis
1/31
Methodical Phase Analysis
by
Franois (Frank) Gagnon
2007 by Frank Gagnon
April 2007 / Frank Gagnon
http://www.vibra-k.com/mailto:fgagnon@vibra-k.commailto:fgagnon@vibra-k.comhttp://www.vibra-k.com/http://www.vibra-k.com/http://www.vibra-k.com/ -
8/11/2019 Methodical Phase Analysis
2/31
Breaking Down PHASEANALYSIS into EASY
STEPS
1999, 2007 by Franois Gagnon
Vibra-K Consultants Ltd.
fgagnon@vibra-k.com
The machine illustration is 1997 Technical Associates of Charlotte and is used under Fair Use as a
teaching adjunct to expanded material developed by Frank Gagnon
-
8/11/2019 Methodical Phase Analysis
3/31
-
8/11/2019 Methodical Phase Analysis
4/31
Phase &
Unbalance
Taking the pain
OUT of phaseanalysis
-
8/11/2019 Methodical Phase Analysis
5/31
Phase implies a comparison
Measured Phase in relation to
Rotor position (for balancing)
Another point or locations measuredphase
What it was before
-
8/11/2019 Methodical Phase Analysis
6/31
Phase Measurement
Two-channel execution (comparativephase or complex spectra) offer thesimplest approach
No need for a visible reference off
the rotor
-
8/11/2019 Methodical Phase Analysis
7/31
Phase Analysis Tolerance
The phase difference seen in the lasttwo slides (tables) of thispresentation allow for a variation
Typically 30 degrees
So 60o is equivalent to 90o
-
8/11/2019 Methodical Phase Analysis
8/31
Phase Analysis Tolerance
More than one phenomenon may be drivingphase!
Some authors suggest up to 40o
difference as a tolerance: we findTHIRTY is enough
The caveat about two or more phenomenaacting simultaneously does apply (such as,
for example, unbalance AND misalignment)
-
8/11/2019 Methodical Phase Analysis
9/31
Complete Machine
-
8/11/2019 Methodical Phase Analysis
10/31
FIRST ROTOR / the motor
One rotor at a time in 6 easy steps
-
8/11/2019 Methodical Phase Analysis
11/31
First Step / OB Axial
-
8/11/2019 Methodical Phase Analysis
12/31
2nd Step / IB Axial
-
8/11/2019 Methodical Phase Analysis
13/31
3rd Step / H Phases together
-
8/11/2019 Methodical Phase Analysis
14/31
4th Step / Vertical Phases
-
8/11/2019 Methodical Phase Analysis
15/31
5th Step / Axial Phases Together
-
8/11/2019 Methodical Phase Analysis
16/31
6th Step / H and V
-
8/11/2019 Methodical Phase Analysis
17/31
So far, what have we found ?
?
-
8/11/2019 Methodical Phase Analysis
18/31
Second Rotor / the pump
Same six easy steps
-
8/11/2019 Methodical Phase Analysis
19/31
1- IB Axial
-
8/11/2019 Methodical Phase Analysis
20/31
2- OB axial
-
8/11/2019 Methodical Phase Analysis
21/31
3- Horizontal Phases
-
8/11/2019 Methodical Phase Analysis
22/31
4- Vertical Phases
-
8/11/2019 Methodical Phase Analysis
23/31
5- Axials together
-
8/11/2019 Methodical Phase Analysis
24/31
6- H & V Together
-
8/11/2019 Methodical Phase Analysis
25/31
Both Rotors Together
ACROSS THE COUPLING in
two easy steps
-
8/11/2019 Methodical Phase Analysis
26/31
2) Radial Phases across the
coupling
-
8/11/2019 Methodical Phase Analysis
27/31
-
8/11/2019 Methodical Phase Analysis
28/31
Conclusion ???
Motor has abnormal vertical
phase behavior (180o)
Axial phases across the
coupling are opposed (180o)
Vertical phase across thecoupling are opposed (180o)
-
8/11/2019 Methodical Phase Analysis
29/31
Radial Phase Analysis
-
8/11/2019 Methodical Phase Analysis
30/31
Phase
Difference
0o 30 to
60o90o 120 to
150o180o
Unbalance
(general)H & V
Static(force)
H & HV & V
H & V
Couple H & V H & HV & V
Dynamic H & HV & V
H & V H & HV & V
Eccentric H & V H & V
Resonance H & V H & V
Acrosscoupling
Normal Misalignment(parallel)
Radial Phase Analysis
-
8/11/2019 Methodical Phase Analysis
31/31
Axial Phase AnalysisAxialPhase
0o 30 to60o
90o 120-150o
180o
BearingFace
NormalAll points
Abnormal(4 point
system)
Abnormal(2 point
system)
AcrossRotor
Normal Bent Shaft
AcrossCoupling
Normal AngularMisalignment
top related