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Using Portable Material Property Devices for Pipe Grade Determination

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The industry has been developing in-situ techniques to measure pipe properties in lieu of destructive approaches. This paper will review the techniques available to meet regulation changes announced in 2016 and propose procedural applications to improve repeatability and reliability.

Product Number: 51317--9267-SG
ISBN: 9267 2017 CP
Author: Steve Biagiotti
Publication Date: 2017
Industry: Corrosion Monitoring and Control
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$20.00

Sweeping changes to the United States (U.S.) pipeline safety regulations were announced in 2016 many of which were prompted by the Department of Transportation (DOT) incident findings. Of special note is the new requirement (49 CFR Part 192.607) to determine and verify the physical characteristics of any installed line pipe valves flanges and components where material records are not available. PHMSA estimated in 2013 that at least 5400 miles of line pipe may lack the Reliable Traceable Verifiable and Complete (RTVC) records needed to establish material properties in an HCA Class 3 or Class 4 locations.The industry has been working toward the development of in-situ techniques to measure pipe properties. Attempts to use hardness grain size and chemical composition of line pipe are being pursued as a means to compare the responses with API 5L grade specifications. Joint Industry Development efforts have made progress toward understanding the correlation between hardness and mechanical properties but the techniques are empirically derived and lack the direct material property relationships between the measurement technique and true stress-strain behaviors.Frictional sliding principles (tribology) unlike rebound hardness test methods are based in mechanical engineering and material science and relate deformation parameters as a function of strain rate to true stress and true strain behavior. Extensive deformation responses have been modeled using finite element analysis (FEA) yielding a catalog of yield and tensile strength material combinations. Field measurements are performed under controlled stylus conditions and speeds then the resulting surface responses are compared to this catalog of material responses to establish the actual yield and tensile strength of the component. The technique equally works on pipe valves flanges or other components. The results of an extensive validation study will be shared to demonstrate the accuracy and reliability of the technique as will an overview of the science behind the methodology.Recent applications traversing longitudinal weld seams have revealed unique signatures for LF-ERW versus HF-ERW manufacturing processes. These profiles will have added benefit during field application and characterization of installed line pipe.

Key words: procedure, NDE material verification, grade, yield strength determination, sampling, 192.607

Sweeping changes to the United States (U.S.) pipeline safety regulations were announced in 2016 many of which were prompted by the Department of Transportation (DOT) incident findings. Of special note is the new requirement (49 CFR Part 192.607) to determine and verify the physical characteristics of any installed line pipe valves flanges and components where material records are not available. PHMSA estimated in 2013 that at least 5400 miles of line pipe may lack the Reliable Traceable Verifiable and Complete (RTVC) records needed to establish material properties in an HCA Class 3 or Class 4 locations.The industry has been working toward the development of in-situ techniques to measure pipe properties. Attempts to use hardness grain size and chemical composition of line pipe are being pursued as a means to compare the responses with API 5L grade specifications. Joint Industry Development efforts have made progress toward understanding the correlation between hardness and mechanical properties but the techniques are empirically derived and lack the direct material property relationships between the measurement technique and true stress-strain behaviors.Frictional sliding principles (tribology) unlike rebound hardness test methods are based in mechanical engineering and material science and relate deformation parameters as a function of strain rate to true stress and true strain behavior. Extensive deformation responses have been modeled using finite element analysis (FEA) yielding a catalog of yield and tensile strength material combinations. Field measurements are performed under controlled stylus conditions and speeds then the resulting surface responses are compared to this catalog of material responses to establish the actual yield and tensile strength of the component. The technique equally works on pipe valves flanges or other components. The results of an extensive validation study will be shared to demonstrate the accuracy and reliability of the technique as will an overview of the science behind the methodology.Recent applications traversing longitudinal weld seams have revealed unique signatures for LF-ERW versus HF-ERW manufacturing processes. These profiles will have added benefit during field application and characterization of installed line pipe.

Key words: procedure, NDE material verification, grade, yield strength determination, sampling, 192.607

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