7/28/2019 Study on Skirt-To-Shell Attachment of Coke Drum
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Paper No. PVP2011-57314, pp. 305-310; 6 pages
doi:10.1115/PVP2011-57314
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Study on Skirt-to-Shell Attachment of Coke Drum by
Evaluation of Fatigue Strength of Weld MetalYasuhiko Sasaki and
Shinta Niimoto
[+] Author Affiliations
ASME 2011 Pressure Vessels and Piping Conferenc e
Volume 3: Design and Analysis
Baltimore, Maryland, USA, J uly 1721, 2011
ISBN: 978-0-7918-4453-3
2011 ASME
A skirt-to-shell attachment of a coke drum experience severe
thermal cyclic stresses, which cause
failures due to low cycle fatigue. Various skirt attachment
designs, therefore, have been proposed and
implemented. A design where the skirt is attached by a weld
build-up is most commonly used. A design
where the skirt is attached to the drum shell by utilizing an
integral machined plate or forging has been
utilized in several projects. One of the advantages of the
integral skirt attachment is that a large innerradius can be formed
which allows reducing stress concentration compared with the weld
build-up
design. This advantage can be confirmed easily by FE-analysis in
recent years [1] [2] [3]. Another major
advantage of the integral skirt attachment is that the area of
highest stress intensity is located at the
base metal section, not at the weld metal or the heat affected
zone which are generally thought to have
lower fatigue strength. The fatigue design curve from ASME
Section VIII Division 2 [9] is based on fatigue
tests for the base metal. It is necessary to reveal differences
of fatigue strength among these metals.
This paper describes a comparison of fatigue strength of three
metals: i) base metal ii) weld metal iii)
heat affected zone provided by the low cycle fatigue test for 1
1/4Cr-1/2Mo materials. Our results
indicate that the fatigue life of the base metal is about twice
as long as that of the weld metal and about
three times as long as the heat affected zone. Accordingly, the
integral skirt attachment is more resistant
to cracking than its welded counterpart from a fatigue strength
viewpoint.
2011 ASME
Topics: Metals, Coke, Fatigue strength, Shells
ABSTRACT
Abstrac t
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