Engineering calculation suite

Pressure Piping Minimum Thickness Calculator

ASME B31.3 Process Piping • ASME B31.1 Power Piping • ASTM reference framework

Project information

Line tag / numberDescriptionProjectLocation

Piping code

Design conditions

Unit systemDesign pressure(psi or MPa)Design temperature(°F or °C)Outside diameter(in or mm)Corrosion allowance(in or mm)Mill tolerance(% (e.g. 12.5))

Material & joint

Material specificationAllowable stress S(psi or MPa)Joint efficiency E

Calculation report

P-201

Process piping line

Required nominal thickness

0.285 in

Required minimum thickness

0.249 in

Pressure design thickness

0.124 in

MAWP check

965.0 psi

Governing case: Hoop stress (B31.3 straight pipe). Corrosion allowance of 0.125 in and mill tolerance of 12.5% included.

Detailed results

Pressure design thickness (t): 0.124 in

Minimum required (t + CA): 0.249 in

Nominal (incl. mill tolerance): 0.285 in

MAWP basis: 965.0 psi

Standards basis

ASME B31.3Process Piping — internal-pressure thickness (para. 304.1)

ASME B31.1Power Piping — internal-pressure thickness (para. 104.1)

ASME B31.3 Table A-1Allowable stress values (user verified)

ASME B31.3 Table 304.1.1Straight pipe wall thickness formula coefficients

ASME B31.1 Table A-1Power piping allowable stress reference

ASME BPVC II-DAllowable stress values for base materials

ASTM A106 / SA-106Seamless carbon-steel pipe reference

ASTM A53 / SA-53Carbon-steel pipe reference

ASME B36.10MWelded/seamless wrought steel pipe dimensions (NPS)

API 570Piping inspection code (in-service reference)

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