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New Inventions for Extending The
Service Life of Coke Drums
Mahmod Samman, Ph.D., P.E.
Houston Engineering Solutions, LLC
(+1) 832-512-0109
RefComm
Galveston 2016
www.hes.us.com
Overview
Three issued and pending HES patents in last
two years aimed at mitigating or minimizing
classic coke drum failures:
• Non-welded skirt attachment
• Non-bolted skirt anchors
• Fatigue-resistant shell
2
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Non-welded skirt attachment
3
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Skirt Attachment Cracking
4
API 1996 Survey
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HES Tongue-and-Groove Skirt
5
6www.hes.us.com
Status
6
• Precedents:
– Sliding skirt 2002 (24+ drums in operation)
– Retrofit 2011 - in operation
– Undocumented set 30+ years in operation
• Being implemented
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Non-bolted skirt anchors
7
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Skirt Bolt failures
8
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HES Clearance-Restraint Anchors
9
10www.hes.us.com
Status
10
• Not aware of any precedents
• Being implemented
www.hes.us.com
Fatigue-resistant shell
11
www.hes.us.com
Seam Bulging
12
Weil & Rapasky 1958
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HES Staggered-Seam Shell
13
14www.hes.us.com
Status
14
• Not aware of any precedents
• No pending implementation
www.hes.us.com
Summary
Three issued and pending HES patents in last
two years aimed at mitigating or minimizing
classic coke drum failures:
• Tongue-and-Groove skirt attachment
– Being implemented
• Clearance-Restraint skirt anchors
– Being implemented
• Staggered-Seam shell design
15
