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VALIDATON OF THE ASME B31G AND RSTRENG
METHODOLOGIES FOR THE DETERMINATION OF THE
BURST PRESSURE OF CORRODED PIPES IN API 5L X70 / EN
10208-2 L485
Frédéric Dewint, AIBFrédéric Dewint, AIB--Vinçotte InternationalVinçotte International
33rdrd ASME India Oil & Gas Pipeline Conference, 2011, February 3ASME India Oil & Gas Pipeline Conference, 2011, February 3--5, Goa, India5, Goa, India
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CONTENTS
• OBJECTIVES OF THE STUDY
• FAILURE PRESSURE ACCORDING ASME B31G AND RSTRENG
• TEST PROGRAM
- Burst tests
- Strain gauge measurements
- Calculations in accordance with ASME B31G and RSTRENG
- Linear and Nonlinear Finite Element Calculations
• CONCLUSIONS
VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
REMARK
The study was performed in collaboration between
AIB-Vinçotte International (www.vincotte.com)
Fluxys (www.fluxys.com)
Labo Soete of the Ghent University (www.tribology-fatigue.ugent.be)
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
OBJECTIVES OF THE STUDY
• Validate ASME B31G and RSTRENG methodologies on pipe in X70 / L485 material with supplementary requirements related to :
- ratio yield strength / tensile strength
- impact testing at –20°C
• Demonstrate the real safety margin of corroded high pressure gaspipelines in X70 / L485 against bursting under internal pressureloading.
• Assess the capability of Finite Element calculations for predicting the failure pressure of corroded pipes and in a further step thefailure pressure of corroded fitings.
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
ASME B31G & RSTRENG
• The ASME B31G and RSTRENG methodologies are used for the determination of the remaining strength of externally corroded pipe subjected to internal pressure loading.
• Both methodologies modelize defects by their depth d and by their length L in the longitudinal direction. The defect width w is not considered explicitly in the calculation.
• RSTRENG allows to take into account more accurately the corrosion defect geometry.
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
LIMITATIONS
• Limited to corrosion on weldable pipeline steels categorized as carbon steels or high strength low alloy steels.
• Do not apply to welds except to corrosion anomalies in submerged arc seam welds.
• Defects caused by mechanical damage, such as gouges and grooves, are prohibited.
• Limited to anomalies having depths lower than 80 percent of the wall thickness.
• Limited to defects which have relatively smooth contours and cause low stress concentrations (e.g. electrolytic or galvanic corrosion, loss of wall thickness due to erosion).
• Only internal pressure loading is considered.
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
ASME B31G CALCULATION METHOD
failure pressure is Pfail = 2 x Sfail x t / D with :
D : diameter of the pipe
t : wall thickness of the pipe
Sfail : failure stress = S (1-A/Ao)/[1-(A/Ao)(MT-1)]
S : flow stress = 1.1 SMYS
A : defect area in the longitudinal plane through the wall thickness ; B31G considers A = (2/3) d L
Ao : is L t
MT : two-term Folias factor ; f(L, Dt)
L : axial extent of the defect
d : maximum defect depth
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
RSTRENG CALCULATION METHOD
failure pressure is Pfail = 2 x Sfail x t / D with :
D : diameter of the pipe
t : wall thickness of the pipe
Sfail : failure stress = S (1-A/Ao)/[1-(A/Ao)(MT-1)]
S : flow stress = SMYS + 10 ksi = SMYS + 69 MPa
A : defect area in the longitudinal plane through the wall thickness ; if no detailed analysis, i.e. : 0.85 d L
Ao : is L t
MT : three-term Folias factor ; f(L, Dt)
L : axial extent of the defect
d : maximum defect depth
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
TEST PROGRAM
• To demonstrate the validity of the ASME B31G and RSTRENG methodologies for pipe material X70/L485, a test program was defined by Vinçotte in collaboration with Fluxys and the Laboratory Soete of Ghent University :
- burst testing of the test pieces with artificial defects
- comparison with failure pressure from ASME B31G & RSTRENG
- comparison with failure pressure calculated by finite element method
- comparison of strain gauge measurements with the strains from finite element calculations
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
TEST PIECE PARAMETERS
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
TEST PIECE 4 drawing
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
Strain gauges installation
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
Strain gauges installation
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
TEST PIECE 1 tensile test results
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
TEST PIECE 1 impact test results – 2 o’ clock
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
3D model
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
TP1 : DN600 tactual = 11.3 mm Pdesign = 80 bar
Defect 3 : L = 210 mm d = 4.1 mm w = 100* mm
Actual Burst Pressure : 214 Bar
ASME B31G : 166 bar RSTRENG : 164 bar FEM-NL : 175 bar
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
TP2 : DN600 tactual = 11.4 mm Pdesign = 80 bar
Defect 2 : L = 200 mm d = 6.8 mm w = 128 mm
Actual Burst Pressure : 150 bar
ASME B31G : 143 bar RSTRENG : 133 bar FEM-NL : 83 bar
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
TP3 : DN900 tactual = 13.4 mm Pdesign = 84 bar
Defect 2 : L = 300 mm d = 4.0 mm w = 200 mm
Actual Burst Pressure : 173 bar
ASME B31G : 134 bar RSTRENG : 134 bar FEM-NL : 125 bar
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
TP4 : DN900 tactual = 13.4 mm Pdesign = 84 bar
Defect 1 : L = 300 mm d = 6.0 mm w = 600 mm
Actual Burst Pressure : 133 bar
ASME B31G : 122 bar RSTRENG : 118 bar FEM-NL : 97 bar
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
RESULTS
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
Strain Gauge Measurement Results
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
Comparison strain gauge measurements / FEM
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
Test Piece 2 - defect 1 / Von Mises stresses
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TP4 defect 1 - Von Mises strain : max. 1.1% at 75 bar
VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
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TP4 defect 1 - Von Mises strain : max. 1.8% at 82.5 bar
VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
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TP4 defect 1 - Von Mises strain : max. 3.2% at 90 bar
VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
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TP4 defect 1 - Von Mises strain : max. 5.1% at 97.5 bar
VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
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TP4 defect 1 - Von Mises strain : max. 23 % at 105 bar
VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
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VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485
CONCLUSIONS
• The failure pressures calculated with ASME B31G and RSTRENG method are conservative values compared with the actual bursting pressure values.
• The failure pressures calculated with the nonlinear FEM method are conservative values compared with the actual bursting pressure values.
• The failure pressures calculated with the linear FEM method are too conservative in order to be useful for practice.
• The correspondence between the strain gauge measurements and the FEM calculated strains was good in the range were measurements were possible.
• Corroded pipe in X70 / L485, as ordered in Belgian practice, has large safety margin against bursting under internal pressure.
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Questions & Answers
VALIDATION OF THE ASME B31G AND THE RSTRENG VALIDATION OF THE ASME B31G AND THE RSTRENG
METHODOLOGIES FOR PIPE MATERIAL X70 / L485METHODOLOGIES FOR PIPE MATERIAL X70 / L485