Page 512 - Corrosion Engineering Principles and Practice

478 C h a p t e r 1 2 C o r r o s i o n a s a R i s k 479

Start on-site
investigation

Identify nature
of failure

Identify origin
of failure

Examine all Examine plant for
fracture surfaces corrosion products

Identify relation of
origin(s) of failure
to plant geometry

Is NDT
required and No
possible ?

Yes
Proceed with
NDT

FIGURE 12.1 Decision tree to guide on-site investigations dealing with
corrosion damage.

The depth of the failure analysis into the roots of a failure is the
key to accurately unearthing all the failure sources. Looking at
machinery failures one finds that there are [5]
Physical roots: The physical reasons why the parts failed
Human roots: The human errors of omission or commission that
resulted in the physical roots
Latent roots: The deficiencies in the management systems or the
management approaches that allow human errors to continue
unchecked