Hydrocarbon Processing - February 2022 - GP-32

PIPELINES AND UTILITIES
Recommendation. It was concluded
that the impact of the intermittent 50%
caustic concentration and the new catalyst
type corroded the titanium part, resulting
in thrust bearing failure.
The vendor confirmed that the use
of titanium is not a common selection,
Corrosion started
at the titanium
bush carrier
High concentrated
50% sodium
hydroxide injection
Insufficient
dilution upstream
the pump
Catalyst type
replacement
and reaction with
titanium part
Pump G-111 A
Trip
FIG. 3. Proprietary processa identifying the casual factors and sequence of a pump trip.
Bolts grip was lost
Bush carrier
diameter reduction
by 4 mm
All bolts became
loosened
loosened
Process SG was
analyzed 1.3 and
not 1.07 (design)
but the request had been made by the
customer during the project design. Additionally,
it was noticed that the other
pump components that are made of duplex
stainless steel did not experience any
corrosion attack.
From these findings, vendor expeBush
carrier moved
axially and radially
The free movement
resulted in skidding
Rear thrust pad
and thrust washer
shattering
The pump had high
end float that is more
than 1 mm (1.42 mm)
In sufficient thrust
load resistance
Rotor moved
axially
Impeller rubbing
with the casing
Motor overload
rience and the corrosion chart, it was
recommended to upgrade the bush
housing material upgrade to duplex
stainless-steel material. GP
NOTES
a TapRoot
FAISAL AL DOSSARY is a Consulting Services
Department Engineer for Saudi Aramco. Mr. Al Dossary's
experienced ranges from reliability programs, such as
vibration monitoring and condition monitoring,
to troubleshooting, equipment design improvement,
project management and commissioning. He graduated
from Oregon State University with a BS degree (honors)
in mechanical engineering. The author can be reached
at Faisal.dossary.32@aramco.com.
DHEDAN AL DOSSARY is a Maintenance Reliability
Engineer for Saudi Aramco. He joined the company
in September 2018 as a Reliability Engineer in the
Wasit Gas Plant Department. As a Plant Reliability
Engineer, he specializes in rotating equipment
condition monitoring, commissioning, overhauling,
troubleshooting and conducting reliability
improvement studies. Mr. Al Dossary's experience
lies in different mechanical sectors, such as static
equipment and engineering design, reciprocating
compressors pumps, steam turbines, centrifugal
pumps and compressors. He graduated from King Fahd
University of Petroleum and Minerals with a BS degree
(honors) in applied mechanical engineering. The author
can be reached at dhedan.aldossary@aramco.com.
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Hydrocarbon Processing - February 2022

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