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51317--9534-The Dilemma Found During Investigative Digs

Picture for The Dilemma Found During Investigative Digs
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Coatings are supposed to be the first line of defense against corrosion, while cathodic protection is secondary. Is this really occurring? The findings of direct examination digs appear to show otherwise.

 

Product Number: 51317--9534-SG
ISBN: 9534 2017 CP
Author: Joseph Pikas
Publication Date: 2017
Industry: Coatings and Linings
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Due to great chemistry and metallurgical innovations of the steel industry higher strength steels have made significant strides in specified minimum yield strength (SMYS) wall thickness control toughness weight per foot etc. However one significant factor in these great improvements was no consideration for corrosion allowances. It has decreased with every incremental increase in the making of higher strength steels. Corrosion in carbon steel is the same whether it is a 35000 yield pipe or an 80000 yield pipe or 0.375” wall thickness versus 0.215” wall thickness. 25% wall loss on 35000 yield pipe results in a 44% on the higher strength steel pipe. Lower strength steel direct assessment results in recoat type repair while higher strength steel results in a composite repair or replacement. Unfortunately the US coating industry and pipeline operators have not kept up with these changes to offset or compliment the improvements in great improvements made in higher strength steel. The dilemma either add more corrosion allowances to the steel and/or improve the coatings. Coatings are supposed to be the first line of defense against corrosion control while cathodic protection is secondary.

Keywords: Specified Minimum Yield Strength (SMYS), Fusion Bonded Epoxy (FBE), Remaining Strength of Corroded Pipe (RSTRENG)

 

Due to great chemistry and metallurgical innovations of the steel industry higher strength steels have made significant strides in specified minimum yield strength (SMYS) wall thickness control toughness weight per foot etc. However one significant factor in these great improvements was no consideration for corrosion allowances. It has decreased with every incremental increase in the making of higher strength steels. Corrosion in carbon steel is the same whether it is a 35000 yield pipe or an 80000 yield pipe or 0.375” wall thickness versus 0.215” wall thickness. 25% wall loss on 35000 yield pipe results in a 44% on the higher strength steel pipe. Lower strength steel direct assessment results in recoat type repair while higher strength steel results in a composite repair or replacement. Unfortunately the US coating industry and pipeline operators have not kept up with these changes to offset or compliment the improvements in great improvements made in higher strength steel. The dilemma either add more corrosion allowances to the steel and/or improve the coatings. Coatings are supposed to be the first line of defense against corrosion control while cathodic protection is secondary.

Keywords: Specified Minimum Yield Strength (SMYS), Fusion Bonded Epoxy (FBE), Remaining Strength of Corroded Pipe (RSTRENG)

 

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Product Number: 51317--9542-SG
ISBN: 9542 2017 CP
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51316-7345-New Advances in Epoxy Protective Coatings

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This paper will review the features and benefits of a new epoxy coating technology that allows for true epoxy-amine curing in a single-pack product. Performance versus traditional two-component epoxy products will be compared, and environmental and convenience benefits of single-pack versus two-component packaging will be discussed.
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51317--9539-Durability of Nano-Coating for Marine Highway Bridge Application

Product Number: 51317--9539-SG
ISBN: 9539 2017 CP
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Nanoparticles are being considered in the development of durable coating systems due to their beneficial electrical and mechanical properties. The present study aims to investigate the corrosion performance of a nanoparticle enriched zinc rich primer (NPE-ZRP) for structural steel in aggressive marine exposure.
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