Maryrose Jakeway interned as a mechanical engineer at ArcelorMittal Burns Harbor. During her summer internship, she completed safety tours of the facility and received training in CPR and arc flash safety. For her projects, she created a report on a recent fire and analyzed the operational envelope of a steam pressure reducing valve after a failure in March. By modeling the steam system and comparing ideal conditions to actual conditions, she aimed to understand why and how the failure occurred and develop lessons learned.
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IntroductionIntroduction
Maryrose Jakeway
Michigan State University
Mechanical Engineering
Exp Grad: December 2016
MEU Op Tech
Manager: Derek Rinaldo
Mentor: Kaethe Pfeiffer
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What I Did This SummerWhat I Did This Summer
For Fun
Reading/Cooking/Painting/Exploring the
Area/Binge Watching TV
Boat Cruise
RailCats Game
White Sox Game
For Work
Safety Tours & Training
Eagle Incident Report
Power Station SPRV
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Tours & Training (1-2)Tours & Training (1-2)
Safety Tours
Sewage Pumping Station
Shops Complex
Docks
Locomotive Repair
Fabrication Shop
Machine Shop
Crane Repair
Central Spares
Main Shop &
Annex Building
Blast Furnace
Closed Water
Pumping Station
Lakewater
Pumping Station
No. 1
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Tours & Training (2-2)Tours & Training (2-2)
Additional Tours
Power Station
Steel Producing
Iron Producing
Sinter Plant
Hot Mill
I/N Tek & I/N Kote
Research & Development
Training
CPR / First Aid
Arc Flash
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ProjectsProjects
Eagle Incident Report
Created follow-up document for June 6th fire under waste treatment
bridge.
Power Sta South 900/265 psi Steam Pressure Reducing Valve (PRV)
Modeled S. PRV steam system.
Analyzed current design to determine nominal operational envelope.
Compared ideal conditions to 3/20/15 failure.
In progress: Operational Procedure Report.
7. Safety Valves on 265 # pipe
Damage resulting from 3/20/15
Learned how to perform an engineering
and failure analysis.
First learn how and why things
work.
Then look at a failure.
What fails? When? Why? How?
Knowing max steam flow rates at
different pressures/ temperatures
changes the operating envelope of the
system and how the equipment will
respond.
Develop a model of the system.
South PRV: LearningSouth PRV: Learning
LessonsLessons
8. 500 600 700 800 900 1000 1200
200 2.725 3.059 3.38 3.693 4.003 4.31 4.917
250 2.151 2.426 2.688 2.943 3.193 3.44 3.929
300 1.767 2.005 2.227 2.442 2.653 2.861 3.27
400 1.258 1.477 1.651 1.817 1.978 2.136 2.446
500 0.993 1.159 1.304 1.441 1.573 1.701 1.95
600 0.795 0.946 1.073 1.19 1.302 1.411 1.621
700 0.793 0.908 1.011 1.109 1.204 1.385
800 0.678 0.7383 0.877 0.964 1.048 1.209
900 0.588 0.686 0.772 0.852 0.928 1.071
1000 0.514 0.608 0.688 0.761 0.831 0.962
1100 0.453 0.545 0.619 0.687 0.75 0.872
Input
Temperature (属F) 900
Pressure (PSIA) 900
Sp. Volume (ft
3
/lb) 0.852
Diameter (inches) 20
Min Velocity (ft/s) 100
Max Velocity (ft/s) 300 1250
Output
Min Capacity (klb/h) 921.83
Max Capacity (klb/h) 2,765.49 135.6
Pressure(PSIA)
Temperature (属F)
Properties of Superheated Steam
Velocity (ft/s)
For known capacity and
unknown velocity, use
alternative input/output.
Alternative Input
Capacity (klb/h)
Alternative Output
This model uses the continuity equation to determine capacity at a
given temperature, pressure, pipe dimension, and an assumed range of
operational velocity.
*specific volume is automatically found using steam table