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