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 CORROSION
CASE CR1 - Piping Corrosion, J. Cecilio
Building corrosion into your piping systems.
Problem:
High maintenance cost and early failure.
Symptom:
Define the purpose of the design. Define its
Collection of Facts:
environment.
Solution: Use basic engineering design considerations to evaluate the design
for corrosion.
a.
Design for easy cleaning and drainage.
b.
Design for easy component replacement where service failure is
anticipated.
Avoid high localized stress concentrations.
c.
Avoid dissimilar metal contacts.
d.
Minimize or exclude air.
e.
Avoid heat transfer hot spots.
f.
Join by welding rather than bolts or rivets.
g.
Use smooth wide radius bends in piping systems.
h.
Avoid metallic contact with absorptive materials.
i.
Avoid high velocities.
g.
Aluminum Corrosion in Wood, J. Cecilio
CASE CR2 -
Corrosion of Aluminum in wood-aluminum assemblies.
Problem:
Corrosion of aluminum fasteners in fender pilings.
Symptom:
Collection of Facts: Corrosion of aluminum in wood-aluminum assemblies can be
prevented by using well seasoned wood, coating aluminum with bitumen or other
electrically neutral barriers and avoiding woods that produce a pH 5.0 or
above 7.O as well as bi-metallic action.
Solution: If aluminum fasteners are specified use bitumen paint or other
electrically neutral barrier and avoid woods that produce a pH below 5.0 or
above 7.0.
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