Hydrocarbon Processing - August 2022 - 71

Plant Design, Engineering, Construction and Commissioning
acid gas is separated in the reflux drum and
sent to the acid gas enrichment unit.
The lean amine solution from the bottom
of the stripper column is pumped by
a booster pump through a lean-rich heat
exchanger and then through air coolers to
the top of the contactor. To ensure cleanliness
of the circulated selective amine solution
in the contactor, a 15% slipstream of
the lean solution is passed through a mechanical
filtration system.
Acceptance criteria for soft startup.
A soft startup can be declared successfully
completed when at least two of the following
three criteria are achieved:
* The frequency of strainer cleaning
is reduced to less than one cleaning
activity per strainer every two days.
* Qualitative proof that water
samples are getting clearer every
operating day for three consecutive
days, then stable/no change for
an additional day.
* Stable water chemistry parameters are
achieved for at least two consecutive
days through lab sampling.
PLANT TEST RUNS
Amine System A. Amine System A
was placed under a soft startup on December
4, 2019, and in cold circulation
until December 13, 2019. During the
cold circulation phase, four of the lean
amine cooler bays (50%) were isolated
and amine was run through the other
four bays to increase turbulence and
ensure cleanliness (FIG. 2). After the
system was stabilized and the in-service
bays were deemed clean, the bays were
isolated and the other four bays were put
in service. The switching practice continued
until consistent readings on the
pump strainers were achieved. Following
that, amine System A was placed in
hot circulation.
As previously highlighted, one of the
acceptance criteria of the soft startup is
sample bottle clarity. FIG. 3 shows the
progression of water clarity by the samples
collected from amine System A. It
can be clearly seen that the water in the
system became clearer and cleaner during
the soft circulation period.
The first sample (on the right) shows
the highest level of dirt. Moving to the
left, the samples progressively show an
improvement in water quality.
Fin fan tubes were cleaned by limiting
flow to four bays at a time, which allowed
turbulence flow across the fin fan tubes.
TABLE 1. Lab analysis for water samples, amine System A
Analysis
Conductivity
TDS
TSS
Total iron
12/11/19
428
210
3
0.98
Amine System A
12/12/19
430
215
3
1.1
1/14/19
422
211
7
1.08
Unit
micros/cm
ppm
ppm
ppm
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