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Localized Corrosion Managing Clamp in a Crevice Between Clamp and CRAs Pipe/Tube Line

Picture for Localized Corrosion Managing Clamp in a Crevice Between Clamp and CRAs Pipe/Tube Line
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To support installed tube lines, plastic clamp systems (which cause a high risk of corrosion failure of the pipe and tube) have been widely used. Crevice corrosion resistance of such was investigated based on the standard test methods. Characteristics were analyzed and operational life time estimated.

Product Number: 51317--9281-SG
ISBN: 9281 2017 CP
Author: Byoung Young Yoon
Publication Date: 2017
Industries: Corrosion Monitoring and Control , Science of Corrosion
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$20.00
$20.00

Fluid flowing CRA pipe/tube line systems are usually subjected to repeated impulse and vibration. To support installed pipe/tube line plastic clamp systems have been widely used for various industries such as oil and gas industries ship building and power plants. However the plastic clamp system has high risk of corrosion failure on the pipe and tube underneath plastic clamp bodies which are supporting component for the clamp. Local failure (crevice corrosion) is initiated and propagated by changes in local chemistry within the crevice (between plastic clamp body and metal pipe and tube line). The localized corrosion in crevice is not predictable and once it is initiated the corrosion is extremely accelerated. As a result it can develop leakages that may lead to abrupt failure of CRA tubing/piping system.To prevent localized corrosion on the metal pipe/tube line underneath the clamp body the galvanic effect is used. In this paper the effect of inserting sacrificial anode between plastic clamp and pipe/tube line is investigated based on standard test method. And the corrosion characteristic of sacrificial anode is analyzed from lab test and field test results. Furthermore the operational life time of the anode inserting clamp is estimated.

Key words: Localized Corrosion, Crevice Corrosion, Clamp, Stainless Steel, Marnie Atmosphere

Fluid flowing CRA pipe/tube line systems are usually subjected to repeated impulse and vibration. To support installed pipe/tube line plastic clamp systems have been widely used for various industries such as oil and gas industries ship building and power plants. However the plastic clamp system has high risk of corrosion failure on the pipe and tube underneath plastic clamp bodies which are supporting component for the clamp. Local failure (crevice corrosion) is initiated and propagated by changes in local chemistry within the crevice (between plastic clamp body and metal pipe and tube line). The localized corrosion in crevice is not predictable and once it is initiated the corrosion is extremely accelerated. As a result it can develop leakages that may lead to abrupt failure of CRA tubing/piping system.To prevent localized corrosion on the metal pipe/tube line underneath the clamp body the galvanic effect is used. In this paper the effect of inserting sacrificial anode between plastic clamp and pipe/tube line is investigated based on standard test method. And the corrosion characteristic of sacrificial anode is analyzed from lab test and field test results. Furthermore the operational life time of the anode inserting clamp is estimated.

Key words: Localized Corrosion, Crevice Corrosion, Clamp, Stainless Steel, Marnie Atmosphere

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Online Continuous Corrosion Monitoring for Detection Monitoring and Control of Localized Corrosion

Product Number: 51317--9065-SG
ISBN: 9065 2017 CP
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The authors will demonstrate that deploying only a modest number of point measurement devices in an area of elevated localized corrosion risk will provide the best possible combination of probability of detection (POD) as well as ongoing wall thickness monitoring for localized corrosion attack.
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A new design for testing crevice corrosion on tube has been developed and qualified using finite elements simulations. The results show a relatively good distribution in pressure below the gasket.

 
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