1. End of Term Presentation: Fall 2015
Nathan Lex
CBG Tech Services Co-op
Term 4 of 5

2. About Me
 From Dublin, Ohio
 Fourth Co-op with Marathon
– Canton Fall 2013
– Canton Summer 2014
– Cincinnati Spring 2015
 Education
– Fourth year at the University of Cincinnati
– Bachelor’s in Chemical Engineering
– Graduate Spring of 2017
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3. Goals for the Fall
My Goals
 Personal Goals
– Take on as many unit engineer
responsibilities as I can
– Get the chance to learn a new unit and
understand how it is integrated with
the rest of the refinery
 Professional Goals
– Strengthen communication skills
– Strengthen technical knowledge on
unit/tower design
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4. Projects and Responsibilities
 CFU Max Rate Test
– Field data collection
– Mass and Energy Balance
– Post Audit Memo
 Deepcut TAR
– Deepcut PI Graphics
 CFU/LEP FOE Metrics
 Spring 2015 Bundle Cleaning Program Memo
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5. CFU Max Rate Test
Scope of Work
 Complete CFU Max Rate test
– Assisted operations with temperature
and pressure surveys around all heat
exchangers and pumps
– Collected routine and non-routine
samples during varying step test rates
Results
 Mass and Energy Balance
– CFU Charge Rate: 40 MBPD
– CFU Charge Rate: 46.2 MBPD
 Recommendations for future process
improvement
 Post-rate test memo
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6. Deepcut TAR: South End
Scope of Work
 Internal vessel and tower inspections
– Mechanical damage & Cleanliness
 FCO & PSSR Walk-downs
 Tracking Heat Exchanger bundle cleaning &
collecting samples
 Mic’d and verified orifice plate installation
 PI Graphics
– Update graphics to show new equipment and circuits
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7. Deepcut TAR: PI Graphics
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8. Deepcut TAR: PI Graphics cont’d…
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9. CFU/LEP FOE (Focused on Energy) Metrics
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Scope of Work:
 Identify energy metric points within the unit to track
 Develop FOE metrics and implement in UPM and Optimization Envelope
Results
 Worked with Design Engineer and Energy Technologist to determine energy
targets on the identified metric points
 Developed five metrics within the CFU
– Steam to Feed Ratios: Dehex, Debut and Deprop Towers
– Absorbed Duty to Feed Ratio: Naphtha Splitter
– Excess %O2: Naphtha Fired Reboiler
 Developed two metrics within the LEP
– Absorbed Duty to Feed Ratio: Dehex
– Excess %O2: Dehex Fired Reboiler
 Drafted memo

10. Bundle Cleaning Program-Spring 2015
Scope of Work
 Analyze pre and post-cleaning data on all exchangers cleaned in the Spring
2015
 Determine the economic/operational benefit of cleaning each bundle
– Heater duty gains
– Reducing hydraulic limitations
– Avoiding NTE limit
Results
 Developed justifications and incentives for bundles that were cleaned
 Drafted post-audit memo
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11. My Experience
My Experience
 Received the opportunity to take on
greater responsibility
– TAR
– CFU Rate Test
– FOE Metrics
 Lessons Learned
– Challenging my assumptions prior to
drawing a conclusion
 Take Away
– Greater understanding on unit
integration and tower design
– Greater confidence as an engineer
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12. Special Thanks
 Mentor: Rob Dugan
 Supervisors: Wayne Kinnel & Greg Peach
 TAR Group: Liz Chapman, Nic Adams, Devon Hill & Olivia Fischer
 Tech Service Department
 Everyone at the Catlettsburg Refinery who made this fall a great learning
experience!
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13. Questions
 Please feel free to ask me any questions you may have about my experience
here at Catlettsburg Refining LLC!
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