Life Cycle Cost & Reliability For Process Equipment Page 18
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22Step 8: Pareto charts of vital few cost contributors.
The purpose of Pareto charts is to identify the vital few cost contributors so the details can be itemized
for sensitivity analysis and ignore the trivial many issues. Pareto rules say that 10% to 20% of the
elements of a cost analysis will identify 60% to 80% of the total cost—these items are the vital few items
of concern and need to be carefully considered.
The cost elements for the fix when broken strategy are shown in Figure 6 and reflect the details of Table
5. Clearly the big three items are the vital few elements of concern.
P a r e t o C o s t s F o r F i x W h e n B r o k e n S t r a t e g y
T r a i n i n g c o s t s
D i s p o s a l
C o u p l i n g
O p e r a t i o n s P M v i s i t s
V i b r a t i o n D e p t P d M
M a i n t e n a n c e P M v i s i t s
I m p e l l e r
A c q u i s i t i o n
S h a f t
H o u s i n g
M o t o r s
P u m p B e a r i n g s
E l e c t r i c i t y
S e a l
0
2 0 0 0 0
4 0 0 0 0
6 0 0 0 0
8 0 0 0 0
1 0 0 0 0 0
D i s c o u n t e d C o s t V a l u e s $ s
Figure 6: Pareto Cost Chart For Fix When Broken Strategy
When the maintenance strategy is improved by use of GMP, the absolute values decrease and the
ranking changes somewhat—even though the big three items are the same for Figure 6 and Figure 7.
P a r e t o C o s t s F o r F i x W h e n B r o k e n S t r a t e g y + G M P
T r a i n i n g c o s t s
D i s p o s a l
C o u p l i n g
O p e r a t i o n s P M v i s i t s
V i b r a t i o n D e p t P d M
M a i n t e n a n c e P M v i s i t s
I m p e l l e r
A c q u i s i t i o n
S h a f t
H o u s i n g
M o t o r s
P u m p B e a r i n g s
S e a l
E l e c t r i c i t y
0
2 0 0 0 0
4 0 0 0 0
6 0 0 0 0
8 0 0 0 0
1 0 0 0 0 0
D i s c o u n t e d C o s t V a l u e s $ s
Figure 7: Pareto Cost Chart For Fix When Broken + GMP
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