Sabine Energy · Beaumont gas plant · 2025
Recovering 2.1 MW from an exchanger train nobody could shut down
The problem
Twelve shell-and-tube exchangers on the lean amine circuit were fouling faster than the cleaning schedule assumed. Approach temperature had drifted from 8.5°C to 14.2°C over eighteen months. The reboiler was making up the difference, steam demand was climbing, and the unit hit a throughput ceiling every August when ambient temperatures peaked.
The constraint
No shutdown window until the turnaround, fourteen months out. Capital under $250,000. Nothing could alter the pressure envelope, because re-stamping the vessels would have cost more than the energy was worth.
What I did
Clamp-on ultrasonic meters and skin thermocouples on all twelve units, because the existing instrumentation could not tell me which exchangers were actually fouling. Eighteen months of historian data became a fouling-rate model per unit, which showed four of the twelve were responsible for most of the drift.
I designed a bypass spool that let those four be isolated and cleaned while the unit stayed online, and rewrote the cleaning schedule around measured fouling rates instead of the calendar. A contractor did the tie-ins during a planned rate reduction. Process engineering reviewed and signed the modification.
Baseline year against the year after the change
Baseline year After the change
13%
Less reboiler steam41.6 to 36.2 t/h
2.1 MW
Heat recoveredMeasured over 12 months
$410k
Annual savingPayback in 7 months
+4.3%
Summer throughputCeiling removed
What was mine: the instrumentation plan, the fouling model, the bypass spool design and the business case. The tie-ins were contracted, and the modification was reviewed and stamped by our process engineering lead.