Understanding Installation of Steam Tracing for Long-Term ...
Transcript of Understanding Installation of Steam Tracing for Long-Term ...
High-Performance Heat Tracing
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Understanding Installation of
Steam Tracing for Long-Term
Application Success
- Thomas Perry - QMax
- Carson Hannah - QMax
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High-Performance Heat Tracing
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Best Overall Solutions for Pipe Tracing
2
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Most Options for Equipment Jacketing
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Most Effective Systems for Tank Heating
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Steam Heating Systems for Piping
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High Heat Medium Heat Freeze Protection(Isolation Tracer)
Long Run Hot Oil
Special Case Heating
QMax Jacketed Pipe
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Is this a good
Steam Tracing
System
installation?
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Is this a good
Steam Tracing
System
installation?
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High-Performance Heat Tracing
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Is this a good
Steam Tracing
System
installation?
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Air Gap
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Today we’ll look at:
- Conduction Heat Transfer
- What is Heat Transfer Compound (HTC)
- Test Results – Melting Sulfur w/ Steam Tracing using HTC
- Steam Tracing Designs Tested
- Simulating Varying HTC Thicknesses
- Melt-Out Test Results
- Lessons Learned
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Heat Transfer 101
• Conduction
• Convection
• Radiation
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Conductive Heat Transfer
• Q = UAdT , U = k / l
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Conductive Heat Transfer
• Q = UAdT , U = k / l
Poor “k” = Poor Heat Transfer
Large “l”
Poor “k” = Excellent Heat Transfer
Very Small “l”
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What is Heat Transfer Compound
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Heat Transfer Compound
(HTC) is used to bridge the
thermal gap between two parts
(in this case, pipe and
conductive tracing).
HTC contains graphite and
one or more binder
components which are
formulated for different
applications.
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Heat Transfer Boundaries of Conductive Steam Tracing
1) Film Coefficient of Steam2) Conduction thru Tubing3) Conduction thru very thin HTC4) Conduction thru Aluminum 5) Conduction thru very thin HTC6) Conduction thru Pipe Wall7) Film Coefficient of Process
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3
4
56
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Purpose of Heat Transfer Compound
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Hea
t Tr
ansf
er C
oef
fici
ent
BT
U/
hr
ft2
F
500
3400
300
1920
96 67 37.5
2880
12 10
5001000150020002500300035004000
** HTC = Heat Transfer Compound (k = 0.5 BTU/hr ft F)
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Heat Transfer Compound has a poor “k” so it MUST be used in very thin layers to achieve good heat transfer.
The HTC must also stay in place for long-term success.
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Bottom Line
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How does this
affect the
thermal
performance?
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Melt-Out Testing Using Steam Tracing and HTC
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CST (Carbon Steel Tracing)
Maximize the heat transfer from a contoured, carbon steel tube to the pipe wall /process
Minimize the HTC layer between tracing and pipe
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Steam Tracing Designs Tested
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FTS (Fluid Tracing System)
Maximize the heat transfer from a single tube into pipe wall /process using highly conductive aluminum
Minimize the HTC layer between tracing and pipe
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Steam Tracing Designs Tested
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Field Effects on Thickness- Raised Weld Crowns
- Uneven Distribution of HTC
- Air Gaps between pipe & Trace
- Imperfect Fitting/Welding of tracing
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Simulating Varying HTC Thicknesses
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(3) Different Simulated Gaps
- 1/32 inch (0.031 inch or 0.8 mm)
- 3/32 inch (0.094 inch or 2.4 mm)
- 5/32 inch (0.156 inch or 4.0 mm)
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Simulating Varying HTC Thicknesses
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Melt-Out Test Results
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Melt-Out Test Results
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Melt-Out Test Results
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Melt-Out Test Results
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Melt-Out Test Results
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Take-Aways
2) Training Installers on the purpose and use of Heat Transfer Compound
3) Use a Conductive Steam Tracing System that allows for excellent contact (small layers of HTC)
4) Avoid running Steam Tracing over weld beads
1) Follow Manufacturers’ Guidelines for Installation
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Tight Contact Leads to Long-Term Success
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Loose Contact Leads to Failure
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Thank you
Thomas Perry
Carson Hannah
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