Pipe / elbow wall thickness calculator (to ASME B31.1, B31.3, B31.4 and B31.8)

Pipemill: for the design, analysis and layout of piping components

Pipemill can calculate, in accordance with ASME B31.1, B31.3, B31.4 and B31.8 codes:

  • minimum wall thicknesses for:
    - single element pipes
    - curved elbows.
  • a range of pipe sizes, in one run for B31.1 and B31.3, so allowing the rapid preparation of a piping specification document.

The nearest commercially available pipe sizes are output, using an integral database.

Calculations to ASME B31.3 include Chapter IX, high pressure design andfatigue analysis.

Input data

  • pressure, temperature, allowable stress, corrosion allowance, mill tolerances, weld joint factors, etc.
  • optionally, a range of pipe sizes from 0.5 in. nb (nominal bore) up to 80 in. diameter for evaluation in accordance with ASME B31.1 and B31.3 in English or Metric units
  • curved elbow details, as an alternative to straight pipe.

Calculated pipe sizes

  • minimum required wall thickness, or the minimum corroded wall thickness
  • when applicable, a range of suitable pipe sizes (diameter and wall thickness per size), which can be printed as a single printout.

Analysis support

  • Example analyses
  • Integral database of commonly available pipe sizes, with automatic input of selected pipe data
  • Explanatory notes on ASME B31.1, B31.3, , B31.4, and, B31.8
  • Scientific calculator.
Screenshot: wall thickness calculator


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