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Flow Stress Modules

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CALCULATOR MODULE : ASME B31G Flow Stress   ±

Calculate ASME B31G flow stress from SMYS and SMTS.

Flow stress can be calculated by three methods

  • Sf = 1.1 x SMYS (Plain Carbon Steel T < 120 C and Sf < SMTS)
  • Sf = SMYS + 69 MPA (SMYS ≤ 483 MPa, T < 120 C and Sf < SMTS)
  • Sf = (SYT + SUT) / 2 (SMYS ≤ 551 MPa)

SYT and SUT are the temperature derated yield stress and tensile stress for temperatures above 120 C. The derating factors are valid up to 232 C (450 F). Material specific test data should be used if it is available.

Reference : ANSI/ASME B31G Manual For Determining The Remaining Strength Of Corroded Pipelines (2012)

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CALCULATOR MODULE : AGA NG18 Flow Stress   ±

Calculate AGA NG-18 flow stress from SMYS and SMTS.

Flow stress can be calculated by three methods

  • Sf = 1.1 x SMYS (Plain Carbon Steel T < 120 C and Sf < SMTS)
  • Sf = SMYS + 69 MPA (SMYS ≤ 483 MPa, T < 120 C and Sf < SMTS)
  • Sf = (SYT + SUT) / 2 (SMYS ≤ 551 MPa)

SYT and SUT are the temperature derated yield stress and tensile stress for temperatures above 120 C. The derating factors are valid up to 232 C (450 F). Material specific stress data should be used if it is available.

Reference : AGA Pipeline Research Committee NG-18 Report 204 Ductile Fracture Properties of Selected Linepipe Steels

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CALCULATOR MODULE : PRCI PR 3805 RSTRENG Flow Stress   ±

Calculate PR-3-805 RSTRENG flow stress from SMYS and SMTS.

Flow stress can be calculated by three methods

  • Sf = 1.1 x SMYS (Plain Carbon Steel T < 120 C and Sf < SMTS) original ASME B31G
  • Sf = SMYS + 69 MPA (SMYS ≤ 483 MPa, T < 120 C and Sf < SMTS) RSTRENG
  • Sf = (SYT + SUT) / 2 (SMYS ≤ 551 MPa) modified ASME B31G

SYT and SUT are the temperature derated yield stress and tensile stress for temperatures above 120 C. The derating factors are valid up to 232 C (450 F). Material specific stress data should be used if it is available.

Reference : PRCI, Pipeline Research Committee Project, PR-3-805, “A Modified Criterion for Evaluating the Remaining Strength of Corroded Pipe,” December 22, 1989, PRCI PR-3-805 (R-STRENG) With RSTRENG Disk.

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