Shot
Peening Success Stories for Chemical & Petrochemical
Applications
Shot
peening has proved its effectiveness in extending the
service life and enhancing the performance of metal
components by protecting them against fatigue, fretting
fatigue, stress corrosion cracking and a variety of
other failure mechanisms. Following are some of these
success stories for chemical and petrochemical applications:
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 Fabrication
of Chemical Handling Equipment
Shot
peening has been utilized as a cost savings measure
for construction of chemical handling equipment. In
cases where ammonia or chloride based solutions were
to be contained, a lower cost Stress Corrosion Cracking
(SCC) susceptible material was selected with shot peening
rather than a more expensive non-SCC-susceptible material.
Even with the additional shot peening operation, construction
costs were less than using the more expensive alloy.
The table demonstrates the effectiveness of shot peening
in combating SCC for those stainless steel alloys listed.
A load stress equivalent to 70% of the materials yield
strength was applied.
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Fatigue of Offshore Steel Structures
A
Norwegian research program concluded that the combination
of weld toe grinding and shot peening gave the largest
improvement in the life of an offshore steel structure.
This corresponds to more than a 100% increase in the
as-welded strength at one million cycles. Other research
shows that the improvement in weld fatigue strength
from shot peening increases in proportion to the yield
strength of the parent metal.
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