Engineering calculation suite

Piping Stress Analysis Calculator

ASME B31.3 Process Piping • ASME B31.1 Power Piping • Hoop, longitudinal, expansion & combined stress

Project information

Line tag / numberDescriptionProjectLocation

Piping code

Design conditions & geometry

Unit systemDesign pressure(psi or MPa)Design temperature(°F or °C)Outside diameter(in or mm)Nominal wall thickness(in or mm)Corrosion allowance(in or mm)Mill tolerance(% (e.g. 12.5))Span length(ft or m)Support spacing(ft or m)Stress intensification factor(SIF)Thermal expansion stress(psi or MPa)

Material & joint

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

Stress analysis report

P-301

Process line stress analysis • ASME B31.3

Hoop stress

9820 psi

Longitudinal stress

4910 psi

Expansion stress (×SIF)

8000 psi

Combined stress

13584 psi

Hoop stress ratio

49.1%

Expansion stress ratio

40.0%

Overall: PASS — Hoop stress governs at 49.1% of allowable. Allowable hoop stress: 20000 psi, allowable expansion stress: 20000 psi.

Detailed results

Actual wall thickness (after CA & mill): 0.253 in

Required pressure thickness: 0.124 in

Hoop stress: 9820 psi

Longitudinal stress: 4910 psi

Expansion stress (with SIF): 8000 psi

Reinforcement area reference: -0.85 in²

Standards basis

ASME B31.3 §304.1Straight-pipe wall thickness (hoop stress)

ASME B31.3 §319Flexibility and stress analysis

ASME B31.3 §320Stress intensification factors (SIF)

ASME B31.3 §304.3Branch connection reinforcement

ASME B31.1 §104Power piping stress and thickness

ASME B31.1 §119Expansion stress and flexibility

ASME B31JSIF and flexibility factor data

ASME B16.9 / B16.28Butt-welding fittings reference

ASME BPVC II-DAllowable stress values (user verified)

API 579-1 / ASME FFS-1Fitness-for-service reference

ASTM A106 / ASME SA-106Carbon-steel seamless pipe reference

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