On Passing the Petroleum Professional Engineering Exam
Saturday, July 10, 2021
Casing Design: 2021 #27
The quotient of API burst resistance and the API collapse-pressure rating of a 20-in., 133 lbf/ft, K-55 casing (nominal wall thickness 0.635 in.) is closest to: A) 0.5; B) 1.0; C) 1.5; D) 2.0; E) 2.5; F) 3.0.
Pb=(0.875*2*55000*0.635)/20)=3056=3060 psi.
d/t=20/0.635=31.496.
F5=0.036 use Table 2.3 pg 56 J-55 (F5 is same as K-55).
Pcr=YS(Fr/(d/t))-F5.
Pcr=55000*((1.980/31.496)-0.036))=1493=1490 psi.
3060/1490=2.05, “D”.
(RG P55-56; TS12 P399, P402; GB 6 DTC 2).
Is it necessary to go through the steps of calculating burst and collapse? Can you just use the given burst and collapse of 3060 psi and 1500 psi from the table provided Exam Reference Guide?
Is it necessary to go through the steps of calculating burst and collapse? Can you just use the given burst and collapse of 3060 psi and 1500 psi from the table provided Exam Reference Guide?
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