Model for remaining strength estimation of a corroded pipeline with interacting defects for oil and gas operations

Figures & data

Figure 1. Corrosion feature interaction

Figure 2. ASME B31G assumption for interacting defects (adapted from ASME B31G (2012))

Figure 3. Interacting defects model in ANSYS environment

Figure 4. Model symmetry creation

Figure 5. Meshing and load application

Table 1. Pipe section dimensions and material properties

Parameters	Values
Pipe type Pipe nominal diameter	API 5L$\times$65 steel 300 mm (NPS 12ʹ’)
Length of pipe section	300 mm
Pipe thickness	20 mm
Pipe density	7850 kg/m^3
Ultimate tensile strength	530 MPa
Yield strength	448 MPa
Young modulus	2.07 $\times$ ${10}^5$ MPa

Figure 6. Critical internal pressure estimations using ANSYS FEA

Figure 7. Relationship between the ratio of FEA over RSTRENG method and d/t

Figure 8. Strength estimations of the corroded pipeline using different methods

ASME B31G. (2012). Manual for determining the remaining strength of corroded pipelines: Supplement to ASME B31 code for pressure piping. New York: ASME Press.

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