A designer routed a 10" steam line (550°F) straight for 140 ft between two pipe rack anchors. Stress PDF showed thermal stress = 42,000 psi (allowable = 25,000 psi).
Fix: Added two 90° turns to create a Z-shape with 15-ft legs. New stress = 18,000 psi (pass). No spring hangers needed.
[ \Delta L = \alpha \cdot L \cdot \Delta T ]
Where:
Example (Fluor Design Basis):
Carbon steel, ( \alpha = 6.5 \times 10^-6 ) in/in/°F, ( L = 100 ) ft, ( \Delta T = 300°F )
[
\Delta L = (6.5e-6)(100 \times 12)(300) = 2.34 \text inches
] A designer routed a 10" steam line (550°F)
That 2.34” must be absorbed by bends, loops, or expansion joints.
You don’t need to be an analyst, but you must read the stress PDF’s summary page for these three codes:
Primary Stress – from weight & pressure. [ \Delta L = \alpha \cdot L \cdot \Delta T ] Where:
Secondary Stress – from thermal expansion & contraction.
Fluor’s saying: "Primary = strength. Secondary = flexibility."
Fluor’s training often concludes Lesson 1 with practical heuristics designers should apply before sending the model to the Stress Engineer: Example (Fluor Design Basis): Carbon steel, ( \alpha = 6
While more robust than pumps, large diameter vessels and thin-walled tanks are susceptible to local buckling or distortion if piping loads are excessive.
Course Objective: To move beyond simple route sketching and understand why Fluor’s methodology prioritizes flexibility, supportability, and stress reduction at the layout stage—before the first stress is run in Caesar II.
Target Outcome: By the end of this lesson, you will be able to sketch a piping route that minimizes primary and secondary stresses, reducing rework by 40% and producing a "better pipe stress report" (PDF) that actually passes review on the first submission.