Hydrocarbon Processing - November 2022 - 49

Maintenance and Reliability
based on the possible development of
cracks and/or blisters and delamination
after exposure. Three mild steel panels of
known dimensions were prepared to the
requirements of SSPC SP 10 with an average
substrate profile of 3 mil. The panels
were encapsulated with the foam epoxy
by 1-layer brush application. The applied
epoxy was cured at 68°F in accordance
with the manufacturer's best practices.
The dry film thickness was measured to
be 120 mil. The panels were placed in the
oven and heated until reaching 248°F.
Immediately after, the panels were
quenched into ice water covering at least
¾ of the test panels and then left immersed
until the temperature of the foam epoxy
reduced to -22°F. This test was repeated
for 50 cycles per panel. Specimens were
inspected for cracking and delamination.
Pull-off
adhesion on substrates
cleaned to SSPC 10 and SSPC 11
(ASTM D4541). The objective of this
test was to subject the epoxy foama
to pulloff
adhesion testing when applied onto
substrates prepared to the cleanliness
CUI-2
requirements of SSPC SP 10 and SSPC
SP 11. Mild steel panels of 400-mil thickness
were prepared to the requirements
of SSPC SP 10 (by abrasive blasting) and
SSPC 11 (by power tool) with an average
substrate profile of 3 mil and 1 mil,
respectively. The panels were coated with
the epoxy foam by 1-layer brush application.
One sample of the epoxy foam per
surface preparation method was allowed
to ambient cure while the other was postFIG.
14. CUI-2 after 1,000 hr of testing: no
cracking or delamination were observed on
either power-tool or grit-blasted areas.
FIG. 13. CUI-1 after 1,000 hr of testing: no
cracking or delamination were observed in
the epoxy foam. No underlying corrosion was
detected upon foam removal.
TABLE 4. Simulated CUI testing protocols
Testing regime
CUI-1
FIG. 15. No corrosion for a 2- or 3-layer
system was observed upon the removal of
the epoxy foama
. Minor rust was detected
for a 1-layer system.
Cycle details
Thermal cycle between 248°F and 140°F with
alternating hourly dry/wet periods for 1,000 hr
Thermal cycle between 248°F and 50°F with
alternating hourly dry/wet periods for 1,000 hr
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Wednesday, Nov. 9, 2022 | 10 a.m. CST / 4 p.m. UTC
Daniel Patrick
Hydrogen and CCUS
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Atlas Copco Gas and Process
How Turbomachinery Reliability Enables
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Hydrocarbon Processing
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