ASME B31 Diameter Schedule Calculators

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ASME B31 Pipe Diameter And Wall Thickness Schedule

Calculate ASME B31 line pipe diameter and pressure design wall thickness with and without fabrication tolerances.

For some pipe codes (eg ASME B31.4, ASME B31.8, API RP 111 and AS 2885.1) the fabrication tolerance is included in the design factor, and provided that fabrication tolerances are within the relevant specification. For these codes the pressure design or pressure containment wall thickness equals the nominal wall thickness minus the corrosion and mechanical allowance.

For other codes (eg ASME B31.1, ASME B31.3 and ASME B31.5) the fabrication tolerance must be included in the pressure design calculation. For these codes 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 allowance, 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 cross section versus wall thickness for the selected diameter.

Calculate ASME B31 line pipe diameter, pressure design wall thickness (nominal wall thickness minus fabrication allowance and corrosion allowance), and minimum wall thickness (nominal wall thickness minus fabrication allowance) from nominal wall thickness.

Select the pipe schedule (NPS or ISO etc), pipe diameter and wall thickness, or use the user defined option. Use the Result Table option to display the pipe schedule with nominal wall thickness, minimum wall thickness and pressure design wall thickness for the selected diameter.

Tool Input

schdtype : Schedule Type
diamtype : Diameter Type
- ODu : User Defined Outside Diameter
- IDu : User Defined Inside Diameter
wtntype : Wall Thickness Type
- tnu : User Defined Wall Thickness
ttoltype : Wall Thickness Fabrication Tolerance Type
- txu : User Defined Negative Wall Thickness Fraction
- tfu : User Defined Negative Wall Thickness Allowance
c : Wall Thickness Corrosion Allowance

Tool Output

ID : Nominal Inside Diameter
OD : Nominal Outside Diameter
OD/tn : Diameter Over Wall Thickness Ratio
tf : Wall Thickness Fabrication Allowance
tm : Minimum Wall Thickness
tn : Nominal Wall Thickness
tp : Pressure Design Wall Thickness
tx : Wall Thickness Fabrication Fraction

ASME B31 Pipe Diameter And Wall Thickness Schedule

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