vibration clarke.pdf
TRANSCRIPT
JU6H High Speed (2800 - 3000 rpm) Engine Vibration Guideline
Below is a general guideline showing maximum vibration limits that apply to a rigid mounted diesel engine coupled to a horizontal centrifugal pump used for standby fire protection service. Measurements are to be taken on the pumpshaft/crankshaft centerline in the horizontal, vertical and axial directions (Figure A). This guideline is developed on the basis that the baseframe structure has been completely filled with grout, there is no strain placed on the components by the piping, and the driveshaft or coupling between the engine and pump is properly aligned. The guideline below also does not apply to transient conditions, only while operating at rated speed.
600
6000
60000
2.54E‐06
2.54E‐05
0.000254
0.00254
0.0254
0.254
2.54
0.0001
0.001
0.01
0.1
1
10
100
Frequency (cycles per minute) log
Displacemen
t (m
m, pk‐pk) lo
g
Displacemen
t (m
ils, p
k‐pk) lo
g
1200
1800
2400
3000
3600
4200
4800
5400
12000
18000
24000
30000
36000
42000
48000
54000
Displacement limit = 2.394 mils P‐P (0.061 mm P‐P)
Measure Vibration on the Pump Bearing Housings and on the Engine Block at Crankshaft Centerline. (See Figure A)
Vibration Frequency (Readings Unfiltered)
Figure A
LegendAEO – Axial Reading – Engine OutboardHEO – Horizontal Reading – Engine OutboardVEO – Vertical Reading – Engine OutboardHEI – Horizontal Reading – Engine InboardVEI – Vertical Reading – Engine InboardAPO – Axial Reading – Pump OutboardHPO – Horizontal Reading – Pump OutboardVPO – Vertical Reading – Pump OutboardHPI – Horizontal Reading – Pump InboardVPI – Vertical Reading – Pump Inboard
Note: Hydraulic Institute recommends the foundation weigh at least five (5) times the weight of the pump unit.
2.54E‐070.00001
10 100 1000
Frequency (cycles per second) log
C134155
MJD 14SEP11