Balaceamento

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FACILITIES INSTRUCTIONS,
STANDARDS, & TECHNIQUES
VOLUME 2-2
Previously Published as: Power O&M Bulletin No. 13

Field Balancing Large Rotating Machinery

ENGINEERING DIVISION
FACILITIES ENGINEERING BRANCH
DENVER OFFICE
DENVER, COLORADO

UNITED STATES DEPARTMENT OF THE INTERIOR
Bureau of Reclamation

Revised January 1983
by
Darrell Temple
Mechanical Engineer

Reprinted August1989
Reprinted June 1994
Internet Version Prepared October 1998

PREFACE

One of the primary responsibilities of the Facilities Engineering Branch is to provide technical assistance to
field maintenance personnel. Bulletins such as this are written to provide assistance and knowledge for field
personnel to better perform plant operations. Also, it helps to minimize the number of fieldtrips by Denver
Office personnel.
Since the previous edition (No. 13A, 1946) of this bulletin is outdated and more technical than necessary,
effort has been made to simplify the procedures and to update the bulletin.

iii

CONTENTS


Page

Theory of balancing ...................................................

1


Instrumentation and measurement................................

2Vector techniques........................................................

4


Vector addition............................................................

4


Vector subtraction.......................................................

5


Component vectors......................................................

5


Staticbalancing...........................................................

6


Static balancing - example...........................................

6


Dynamic balancing......................................................

9


Dynamic balancing - example......................................

9


Analytical static balancing - example...........................

16


Analytical dynamic balancing - example.............

17v

CONTENTS-Continued
FIGURES

Figure

Page

I

Elevation of rotor having unbalanced mass......

2


2

Plan of rotor.....................................................

2


3

Vibration amplitude measuring points

location .........................................................

3


Vector OA direction and magnitude.................

4


4
5

Vector addition.................................................

4


6

Vector subtraction.............................................

5


7

Component vectors...........................................

6


8

Static balancing - vectors..................................

8


9



Dynamic unbalanced rotor................................

9


10

Dynamicbalancing - upper guide bearing.........

11


11

Dynamic balancing - lower guide bearing.........

12


12

Dynamic balancing - lower guide bearing,

check...............................................................

14


Dynamic balancing - balance weight

distribution .....................................................

15


14

Conditions at the upper guidebearing...............

16.


15

Weight distribution on rotor arms ....................

17


16

Deflections at upper guide bearing.....................

19


17

Deflections at lower guide bearing.....................

19


18

Divided weight for upper rotor arms No. 2

and 3 ..............................................................

21


Divided weight forlower rotor arms No. 5
and 6 ................................................................

21


13

19

vi

FIELD BALANCING
LARGE ROTATING MACHINERY
Mechanical vibration sources are:

1. Purpose
This bulletin is intended as a guide to aid plant
maintenance personnel in balancing large rotating
machinery. Vibration literature1 can be obtained for
study in more technical...
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