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51315-6057-Ultra High Modulus Carbon Fiber Repair Systems with Stiffness Greater than Steel for Pipeline Applications

Picture for Ultra High Modulus Carbon Fiber Repair Systems with Stiffness Greater than Steel for Pipeline Applic
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Product Number: 51315-6057-SG
ISBN: 6057 2015 CP
Author: Davie Peguero
Publication Date: 2015
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$20.00
$20.00
Fiber Reinforced Polymer (FRP) repair systems on pipe substrates have been used successfully for leak sealing and for reinforcement of pipework in low pressure applications often found in the process industries. Their use has also expanded into pipeline integrity to address corrosion and mechanical damage similar to the concept of welded steel sleeves. These types of defects result in localized elevated stress states leading to shorter design lives. Composite repairs are designed to reduce the strain in damaged areas of pipeline to specific stresses by varying the thickness of repair. This is accomplished through load sharing which results in the reinforcement of the pipe substrate. In general composite repair systems have a modulus in the range of 2-12 Msi which is 15-2.5 times less stiff than the modulus of steel which is 29 Msi. The amount of reinforcement required to reduce the stresses in the steel substrate to the original design limit is a function of the thickness of steel lost and the modulus of the composite repair system. In other words a repair system will have to be a minimum of 2.5-15 times thicker than the amount of steel lost due to substrate damage in order to lower substrate stress to their design levels. By utilizing a composite repair system whose modulus is higher than steel it is possible to design a repair thickness less than that of what was originally lost.In addition higher levels of strain reduction are possible with thinner repairs as compared to existing composite repair technologies. In this paper FEA analysis mechanical characterization and full scale testing on wall loss and dents is conducted to characterize the performance of an Ultra High Modulus moisture cured composite repair system. This high strain lowering efficiency may lead to the repair being able to address issues with gouges cracks wrinkles dents or any other damage which results in high substrate stresses. Also possible is the ability to maintain the original design pressure in areas which location class factor may change to a lower value.
Fiber Reinforced Polymer (FRP) repair systems on pipe substrates have been used successfully for leak sealing and for reinforcement of pipework in low pressure applications often found in the process industries. Their use has also expanded into pipeline integrity to address corrosion and mechanical damage similar to the concept of welded steel sleeves. These types of defects result in localized elevated stress states leading to shorter design lives. Composite repairs are designed to reduce the strain in damaged areas of pipeline to specific stresses by varying the thickness of repair. This is accomplished through load sharing which results in the reinforcement of the pipe substrate. In general composite repair systems have a modulus in the range of 2-12 Msi which is 15-2.5 times less stiff than the modulus of steel which is 29 Msi. The amount of reinforcement required to reduce the stresses in the steel substrate to the original design limit is a function of the thickness of steel lost and the modulus of the composite repair system. In other words a repair system will have to be a minimum of 2.5-15 times thicker than the amount of steel lost due to substrate damage in order to lower substrate stress to their design levels. By utilizing a composite repair system whose modulus is higher than steel it is possible to design a repair thickness less than that of what was originally lost.In addition higher levels of strain reduction are possible with thinner repairs as compared to existing composite repair technologies. In this paper FEA analysis mechanical characterization and full scale testing on wall loss and dents is conducted to characterize the performance of an Ultra High Modulus moisture cured composite repair system. This high strain lowering efficiency may lead to the repair being able to address issues with gouges cracks wrinkles dents or any other damage which results in high substrate stresses. Also possible is the ability to maintain the original design pressure in areas which location class factor may change to a lower value.
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Picture for Testing and Design of Nonmetallic Composite Repair Systems for Pipeline Intergity
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51317--9506-Testing and Design of Nonmetallic Composite Repair Systems for Pipeline Intergity

Product Number: 51317--9506-SG
ISBN: 9506 2017 CP
Author: Davie Peguero
Publication Date: 2017
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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.
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51318-11719-Investigation and case study of composite repair performance at low temperatures on buried pipelines

Product Number: 51318-11719-SG
Author: Tim Mally / Eric Locke / Mahdi Kiani / Roger Walker
Publication Date: 2018
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Impact of exposure to a low temperature environment below -30oC (-22oF) was investigated on a carbon fiber and epoxy composite repair system that had previously been qualified to the ASME(1) PCC-21 Article 4.1 nonmetallic repair standard.
Picture for Chemical Compatibility of Composite Repairs in Refineries and Petrochemical Processing Facilities
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51313-02212-Chemical Compatibility of Composite Repairs in Refineries and Petrochemical Processing Facilities

Product Number: 51313-02212-SG
ISBN: 02212 2013 CP
Author: Larry Deaton
Publication Date: 2013
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