3.5 inch, 9.2 lb/ft tubing:
X-section area = 2.59 sq in (Baker Packer Handbook, or Redbook w/ OD & ID calc.). On the CBT exam, these dimensions would be given in a text box, or even provided in a tricky way as part of a table where you have to be familiar with tubing.
1) ST = 50 dF; BHT = 150 dF: Average = 100 dF.
2) ST = 75 dF; BHT = 75 dF: Average = 75 dF.
dT = 75 - 100 = - 25 dF.
Force applied by dT: 207(Ats)dT = 207(2.59)-25 = - 13,403 lb tension up. (A)
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