Episode 38 · Piping Systems
Piping, Part 2: The Pipe Itself
Part two of Piping Systems treats a pipe as a pressure vessel that also has to survive its route through a plant. Allowable stress, wall-thickness decisions, weld factors, manufacturing tolerance and corrosion allowance explain the pressure design. Sizes, schedules and materials connect calculations to procurement, while thermal growth and occasional loads turn the line into a structure. The episode follows those choices toward installation and hydrotesting before the final part examines transients.
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Inside this episode
- Previously, and the drawing on the desk
- A pipe is a pressure vessel stretched out
- Where the allowable stress comes from
- The refinements: weld factors, tolerance and corrosion allowance
- Sizes and schedules: the strange language of pipe
- Choosing materials: the menu
- Codes: the collected scar tissue of an industry
- Fittings, bends and branches: where the stress gathers
- Joining pipe: welds, threads and flanges
- Gaskets and bolts: a spring that holds a seal
- Valves: the moving parts of a still system
- Supports: holding up a heavy, long, thin thing
- Welding, inspection and heat treatment
- Outside the pipe: coatings, insulation and the hidden enemy
- Thermal expansion: the quiet giant
- Flexibility: designing a pipe that can bend
- Flixborough, 1974: when a bypass became a catastrophe
- Pipe stress analysis: the three questions
- The occasional loads: wind, earthquakes, settlement and slugs
- Lina's routing: making room to grow
- Why it matters: the pipe as a structure
- Epilogue: hydrotest day, and the fast-closing valve
Production credits & AI disclosure
Scripts generated with Claude Opus. Synthetic narration generated with Edge TTS. Reviewed, listened to, and approved by Sankalp Thakur.