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51317--9506-Testing and Design of Nonmetallic Composite Repair Systems for Pipeline Intergity

Picture for Testing and Design of Nonmetallic Composite Repair Systems for Pipeline Intergity
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Pressure cycling and ultimate failure pressure testing was conducted on various pipe samples to verify the design formulas meet the specifications and are correct for use in design of field repairs. Results show that use of strain-based design methodologies for composite repair systems is suitable and effective.

Product Number: 51317--9506-SG
ISBN: 9506 2017 CP
Author: Davie Peguero
Publication Date: 2017
Industries: Materials Selection and Design , Science of Corrosion
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The specific repair design of nonmetallic composite systems is a critical component to the successful usage of this relatively new and advanced material group when applied as a repair of pipeline defects. Various design methodologies are currently available within the existing composite repair design documents ASME PCC-2 Article 4.1 and the ISO/TS 24817 based on the level of testing and understanding of the specific composite system being used. The purpose of this paper is to discuss a testing program to validate the effectiveness of a composite repair system when designed according to formulas using a strain based approach rather than a stress based approach. Simulated corrosion defects manufactured into steel pipe test spools were severe in nature including high percentage wall losses with large dimensions and also large wall losses into the weld seams of the pipe specimens representing a very severely damaged pipeline. Pressure cycling and ultimate failure pressure testing was conducted on various pipe samples to verify the design formulas meet the specifications and are correct for use in design of field repairs. The results of this testing show that the use of strain-based design methodologies for composite repair systems is suitable and effective for long term repairs being applied to pipelines.

Key words: carbon fiber, strain, composite repair, stiffness, corrosion, PCC-2, ISO 24817, pipeline integrity

The specific repair design of nonmetallic composite systems is a critical component to the successful usage of this relatively new and advanced material group when applied as a repair of pipeline defects. Various design methodologies are currently available within the existing composite repair design documents ASME PCC-2 Article 4.1 and the ISO/TS 24817 based on the level of testing and understanding of the specific composite system being used. The purpose of this paper is to discuss a testing program to validate the effectiveness of a composite repair system when designed according to formulas using a strain based approach rather than a stress based approach. Simulated corrosion defects manufactured into steel pipe test spools were severe in nature including high percentage wall losses with large dimensions and also large wall losses into the weld seams of the pipe specimens representing a very severely damaged pipeline. Pressure cycling and ultimate failure pressure testing was conducted on various pipe samples to verify the design formulas meet the specifications and are correct for use in design of field repairs. The results of this testing show that the use of strain-based design methodologies for composite repair systems is suitable and effective for long term repairs being applied to pipelines.

Key words: carbon fiber, strain, composite repair, stiffness, corrosion, PCC-2, ISO 24817, pipeline integrity

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