vibration_severity_graph_colour

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W
e take d
u
e d
ilig
en
ce to
 th
e h
ig
h
est level o
n
 all p
ro
jects reg
ard
less o
f size o
r 
b
u
d
g
et. 
L
earn
 A
b
o
u
t A
rticles 
You can dow
nload educational articles from
 our hom
e page at w
w
w
.vibescorp.ca. H
ere are four recent articles: 
 
 
Learn About Vibration, Volum
e 1 & 2: Basics & Advanced Vibration Analysis. 
 
Electrically Induced Bearing D
am
age, aka Electrical D
ischarge M
achining (ED
M
), Shaft C
urrents. 
 
Failure Prevention of Variable Pitch in M
otion Axial Fans. 
 
 The photos below
 show
 typical projects that w
e have com
pleted. 
 Fig 1. The failure w
as due to defective bearing. 
Fig 2. The stainless steel guard helps prevent m
oisture contam
ination in cooling tow
er fan bearings (a very com
m
on problem
). 
Fig 3. A new
 fan w
as installed due to a com
plete failure of the original. 
Fig 4. Show
s a 200H
P m
otor and fan repair/replacem
ent. 
 
 
S
o
lu
tio
n
 to
 F
ig
. 1 R
eplaced both Fan Bearings 
 
S
o
lu
tio
n
 to
 F
ig
. 3 Installed Brand N
ew
 
& N
ew
 M
otor R
equired. 
 
 
 
 
C
ontrollable Pitch Fan & R
epaired M
otor. 
 S
o
lu
tio
n
 to
 F
ig
. 2 The G
uard has prolonged the 
 
S
o
lu
tio
n
 to
 F
ig
. 4 R
eplaced the O
ld M
otor based 
Life Span of the Fan Bearings from
 3 years to over 
on 20 years of running tim
e and C
om
pleted 
14 years. 
 
 
 
 
 
 
Variable Pitch in M
otion Fan M
aintenance. 
 
 
 
 
 
Fig. 1 
Fig. 2 
Fig. 3 
Fig. 4 
.001 G
.01 G
1 G
10 G
 .1 G
DISPLACEMENT Mils (x.001”) peak to peak
This Chart is based
on ISO 10816-3
VIBRATION SEVERITY GRAPH FOR GENERAL ROTATING MACHINERY 
AMPLITUDE Displacement
1 mil = 25 microns
VE
LO
CI
TY
 (i
ps
 =
 in
./s
ec
/)
 p
ea
k
VERY
ROUGH
DANGER
ROUGH
SLIGHTLY 
ROUGH
FAIR
GOOD
EXCELLENT
2
1.
.6
.4
.3
.2
.15
.1
.05
.01
VE
LO
CI
TY
 (i
ps
 =
 in
./s
ec
/)
 p
ea
k
VERY
ROUGH
DANGER
ROUGH
SLIGHTLY 
ROUGH
FAIR
GOOD
EXCELLENT
100 200 500 1000 1800 5000 10,000 20,000
VIBRATION ANALYSIS
VELOCITY, DISPLACEMENT, ACCELERATION
VELOCITY FOR ACCEPTABILITY - DISPLACEMENT FOR BALANCING 
ACCELERATION FOR BEARING HEALTH CONDITION MONITORING 
50,000 100,000
Velocity
.1 ips= 2.5 mm/s
REFERENCE POINT = 1800 rpm machine/ motor exellent condition
1.7 kHz
ACCELERATION or FORCE OF GRAVITY “G” (ips = in/sec for simplicity)
ACTUAL G = 32 fps/s = 9.8 m/s/s
.08G1.7 kHz
.4
.3
.2
.1
300 100 50 20 10 9 8 7 6 5 4 3 2 1 .8 .5
VERY
ROUGH
DANGER
.001 G
.01 G
1 G
10 G
 .1 G
DISPLACEMENT Mils (x.001”) peak to peak 
This Chart is based
on ISO 10816-3
VIBRATION SEVERITY GRAPH FOR GENERAL ROTATING MACHINERY 
AMPLITUDE Displacement
1 mil = 25 microns
UNACCEPTABLE
INTERNATIONAL STANDARD TIMES 
VE
LO
CI
TY
 (i
ps
 =
 in
./s
ec
/)
 p
ea
k
VERY
ROUGH
DANGER
ROUGH
SLIGHTLY 
ROUGH
FAIR
GOOD
EXELLENT
2
1.
.6
.4
.3
.2
.15
.1
.05
.01
VE
LO
CI
TY
 (i
ps
 =
 in
./s
ec
/)
 p
ea
k
VERY
ROUGH
DANGER
ROUGH
SLIGHTLY 
ROUGH
FAIR
GOOD
EXELLENT
100 200 500 1000 1800 5000 10,000 20,000
VIBRATION ANALYSIS
VELOCITY, DISPLACEMENT, ACCELERATION
VELOCITY FOR ACCEPTABILITY - DISPLACEMENT FOR BALANCING 
ACCELERATION FOR BEARING HEALTH CONDITION MONITORING 
50,000 100,000
BEST CONDITIONS
Velocity
.1 ips= 2.5 mm/s
REFERENCE POINT = 1800 rpm machine/ motor exellent condition
1.7 kHz
ACCELERATION or FORCE OF GRAVITY “G” (ips = in/sec for simplicity)
ACTUAL G = 32 fps/s = 9.8 m/s/s
.08G1.7 kHz
.4
.3
.2
.1
300 100 50 20 10 9 8 7 6 5 4 3 2 1 .8 .5
www.vibescorp.ca email: info@vibescorp.ca Cell: 604 - 619 - 9381
TMSERIOUS SERVICE
Professional Machinery
 
Health
 
Care
UNACCEPTABLEUNACCEPTABLE
ISO STANDARDSISO STANDARDS
BEST CONDITIONBEST CONDITION
www.vibescorp.ca
info@vibescorp.ca
604-619-9381 (24/7)
SERIOUS SERVICE
Professional Machinery Health Care