Calculate ASME B31.3 process piping schedule for metal and plastic piping.
The piping minimum wall thickness and hoop stress wall thickness schedule can be calculated from the nominal wall thickness, fabrication tolerance and corrosion allowance.
`tm = tn - fa `
`tm = (1 - fx) tn `
`t = tm - c `
where :
tn = nominal wall thickness
tm = minimum wall thickness
t = hoop stress wall thickness
c = corrosion thickness allowance
fa = negative fabrication thickness allowance
fx = negative fabrication fraction
The minimum wall thickness equals the nominal wall thickness minus the fabrication allowance. The pressure containment wall thickness equals the nominal wall thickness minus the fabrication tolerance, and minus the corrosion allowance. Fabrication tolerance can be defined by either a fabrication allowance, or a fabrication fraction. The pipe diameter can be defined by either the outside diameter or the inside diameter. Use the Result Table option to display a table of pipe dimensions versus wall thickness, wall tolerance, or piping diameter for metal pipes, or pipe dimension versus wall thickness for plastic pipes.
Calculate metal piping maximum and minimum diameter schedule. Use the Result Table option to display a table of pipe dimensions versus wall thickness, wall tolerance, or piping diameter.
Calculate piping unit mass and joint mass schedule for metal and plastic piping. Use the Result Table option to display a table of pipe dimensions and mass versus wall thickness.
Calculate piping tensile stress, yield stress and allowable schedule for metal piping. Use the Result Table option to display a table of stress versus material type.
Plastic pipe wall thickness can be defined by wall thickness or diameter ratio (DR or IDR). Select standard diameter ratios from the plastic pipe schedule (SDR or SIDR), or use user defined diameter ratios (DR or IDR).
Reference : ANSI/ASME B31.3 : Process Piping (2018)
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