Add corrosion allowance (typically 1.5 – 3 mm) and mill tolerance (12.5%) to get nominal thickness → select schedule.
The lowest rated component in the line (pipe, flange, valve) sets the system pressure rating. Add corrosion allowance (typically 1
) is calculated using factors like internal design gage pressure ( ), outside diameter ( ), and allowable stress ( Corrosion Allowance : Designers must add extra thickness (often 1.5 mm to 3 mm outside diameter ( )
Practical worked examples (concise)
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