Select pipe material based on fluid compatibility and temperature. Calculate required diameter based on velocity constraints. Calculate total pressure drop (friction + fittings). Calculate minimum wall thickness (ASME B31.3). Select standard pipe schedule (e.g., Sch 40, Sch 80). Validate pipe rating against ASME Class.
Weld joint strength reduction factor (for high temperatures) Wall thickness coefficient (depends on material/temp) Select pipe material based on fluid compatibility and
A standard PDF might show: hf = f (L/D) (v²/2g) Calculate minimum wall thickness (ASME B31
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= Mechanical allowances (sum of corrosion allowance, erosion allowance, and thread depth). Tolcap T o l = Mill manufacturing tolerance (typically 0.1250.125 for standard seamless steel pipes). 5. Flange Pressure-Temperature Ratings (ASME B16.5)
The most common mistake in process piping is undersizing to save upfront capital. A 4-inch pipe costs less than an 8-inch pipe, but the pumping cost over 10 years might be triple. A better Module 3 PDF dedicates a full section to —the concept of balancing installed cost with energy consumption.