Hydrocarbon Processing - February 2022 - GP-19

SPECIAL FOCUS: TREATING SOLUTIONS
regimes (scrapping, startup/ shutdown),
solids entailment in the feed gas and defective
level controls. Therefore, it was
proposed to modify the slug catcher internal
to improve gas distribution, improve
solid removal, enhance residence time, improve
gas-liquid separation and minimize
carryover to less than 0.1 gal/MMsft3
.
Install a gas-liquid coalescer. The feed
gas filter-coalescer is an essential piece of
equipment in the AGRU, as it protects
the amine unit from any liquid carryover.
Typically, the system should be designed
with the highest removal rate (99.9% solid
removal and maximum of 0.1 ppmv liquid
in the gas outlet). Since the existing filterseparator
is under-sized, a new filter-coalescer
was recommended. An alternative
is to upgrade the existing one through the
use of different coalescing elements. The
new conditions after installing the dewpoint
control will determine the need to
replace or upgrade the existing system.
Use alternative anti-foam agent. The
current anti-foam that is used at Plant A
is silicone-based. During foaming upsets,
batch injection (concentrated anti-foam)
is applied. The excessive use of this type
has a potential to create operational issues,
such as accumulation in the system, which
could reduce amine capacity and block
equipment like the lean rich exchanger.
It was recommended to consider other
types with less potential impact, such
as
glycol-based. The appropriate type
should go through laboratory testing to
ensure effectiveness, compatibility and
minimum long-term effect.
A new type of anti-foam was implemented
and based on the continuous
monitoring of the main foaming related
parameters of the AGRU, the units' foaming
tendency was significantly reduced
and the number of foaming incidents decreased.
GP
NOTES
a ProMax
SAUD MUDAIBEGH is a Process Engineering Consultant
working for Saudi Aramco. He joined the company in
1995 and is part of the Upstream Process Engineering
Division. He worked in the Uthmaniyah Gas Plant for
3 yr as an Operation Engineer. Mr. Mudaibegh has
25 yr of experience in oil and gas processing with a
focus on gas sweetening, dehydration, NGL recovery,
and modular process units design and fabrication. He
graduated from King Fahd University of Petroleum and
Minerals with a BS degree in chemical engineering. He
is also the Chairman of Oil and Gas Process Engineering
Committee for Saudi Aramco.
MESHAL AL-HARBI is a Process Engineer working for
Saudi Aramco since 2012. He is part of the Process and
Control Systems Department/Gas Processing Group.
Mr. Al-Harbi worked in the Khursaniyah Gas Plant for
3 yr as an Area Operation Engineer, where he gained
extensive experience in several systems: acid gas
removal, acid gas enrichment, gas/liquid dehydration,
mercury removal, propane refrigeration, condensate
stabilization and NGL recovery unit. He also worked
for 2 yr as a Project Engineer in the Hawiyah Unayzah
Gas Reservoir Storage. Mr. Al-Harbi graduated from
King Fahd University of Petroleum and Minerals in 2012
with a BS degree in chemical engineering.
MUHAMMAD RIZWAN TARIQ is a Senior Process
Engineer within the Process & Control Systems
Department for Saudi Aramco. He has also served as
Staff/Senior Engineer at JGC Japan, Worley Oman,
PDO Oman and OGDCL Pakistan. Mr. Tariq has 20 yr
of experience in oil and gas processing with a focus on
gas and liquid sweetening, dehydration, LPG recovery,
condensate stabilization and sour water stripper. He
holds a BS degree in chemical engineering from Punjab
University Lahore Pakistan. He is a chartered member
of IChemE and the Engineering Council UK and a
Professional Engineer from PEC Pakistan. The author
can be reached at muhammad.tariq.1@aramco.com.
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