Advanced Composite Material Property Data Modeling for Engineering Analysis and Design

Abstract Vintage pipelines, which in the context of this paper refer to pipelines built before approximately 1970, account for a large portion of the energy pipeline systems in North America. Integrity assessment of these pipelines can sometimes present challenges due to incomplete records and lack of material property data. When material properties for the welds of interest are not available, conservative estimates based on past experience are typically used for the unknown material property values. Such estimates can be overly conservative, potentially leading to unnecessary remedial actions. This paper is a summary of PRCI-funded work aimed at characterizing material properties and flaw characteristics of vintage girth welds. The data obtained in this work can be utilized to understand and predict the behavior of vintage pipelines, which is covered in a companion paper [1]. The material property data generated in this work include (i) pipe base metal tensile properties in both the hoop (transverse) and the longitudinal (axial) directions, (ii) deposited weld metal tensile properties, (iii) macrohardness traverses, (iv) microhardness maps, and (v) Charpy impact transition curves of specimens with notches in the heat-affected zone (HAZ) and weld centerline (WCL). These data provide essential information for tensile strength, strength mismatch, and impact toughness. In addition to the basic material property data, instrumented cross-weld tensile (ICWT) tests were conducted on CWT specimens with no flaws, natural flaws, and artificially machined planar flaws. The ICWT tests provide an indication of the welds’ stress and strain capacity without and with flaws. For welds with even-matching or over-matching weld strengths, the CWT specimens usually failed outside of the weld region, even for specimens with natural flaws reported by non-destructive examination. Having over-matching weld strength can compensate for the negative impact of weld flaws. All tested girth welds were inspected using radiography and/or phased array ultrasonic testing. The inspection results are compared with the flaws exposed through destructive testing. The ability of these inspection methods to detect and size flaws in vintage girth welds is evaluated.

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Some effects of material property data selection on crack propagation analyses

International Journal of Fatigue ◽

10.1016/0142-1123(83)90030-0 ◽

1983 ◽

Vol 5 (3) ◽

pp. 171-175 ◽

Cited By ~ 2

Author(s):

R.L. Hewitt

Keyword(s):

Crack Propagation ◽

Material Property ◽

Data Selection ◽

Property Data ◽

Material Property Data

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Assessment of Coke Drum Materials Based on ASME Material Property Data

Journal of Pressure Vessel Technology ◽

10.1115/1.4029958 ◽

2015 ◽

Vol 137 (6) ◽

Cited By ~ 3

Author(s):

Milan Nikic ◽

Zihui Xia ◽

Pierre Du Plessis

Keyword(s):

Material Property ◽

Material Selection ◽

Base Material ◽

Operating Conditions ◽

Base Materials ◽

Property Data ◽

Alternative Material ◽

Operation Cycle ◽

Heating Up ◽

Material Property Data

Delayed coking as a part of heavy oil upgrading is characterized with severe thermal–mechanical operating conditions. Coke drums operating under such conditions require proper design and material selection in order to sustain the high stresses caused by the thermal–mechanical loading. This paper has the objective to explore alternative material selections for coke drum applications based on material property data provided in ASME Boiler & Pressure Vessel Code, Section II—Materials. The materials were compared based on the stress levels obtained by using finite element analyses (FEA) for two critical loading scenarios in the coke drum operation cycle, i.e., the heating up and quenching stages. The results show that closer matching in the coefficients of thermal expansion (CTE) between clad and base materials reduce significantly the stress in the clad during heating up stage. Among other material properties, the results show that the variation in Young's modulus values of base materials plays an important role in the variation of maximum stress in the coke drum shell during the bending of the shell caused by quenching water. Among the considered 11 pairs of clad and base material combinations, the combination of SA302-C as the base material and nickel alloy N06625 as the cladding material is recommended for delayed coke drum application.

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