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Unformatted text preview: to drop
completely out of the casing string. If it can
ever happen, maximum load concept
requires that it be designed for. Therefore
with on backup to subtract from the load,
the load line becomes the resultant
also(Fig.8). 151 Fig.8 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 152 76 A collapse design factor(CDF), like the previously
discussed BDF, is applied to incorporate wear
considerations into the design and the design line is
Fig.10 shows a common occurrence, section2 and 3
have collapse strengths which are sufficient but the
collapse strength for section1 truncates on the
collapse design line. If only 3 sections are to be
used, section 1 must be replaced with another
section which will satisfy the collapse requirement.
153 Fig.9 Collapse Design Fig.10 Collapse Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 154 77 If no restriction is placed on the number of sections to be used,
the bottom portion of section 1 must be upgraded. This is what is
illustrated in Fig.11a and Fig.11b. Notice that the burst design is
also upgraded to reflect the pres...
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This document was uploaded on 03/28/2014.
- Fall '14