JPCL September 2020

 
JPCL September 2020


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Combatting Localized Galvanic Corrosion at Bolted Connections in Gravity Sludge Thickeners and Clarifiers

by R. A. Nixon, Corrosion Probe, Inc.; Corrosion Testing Laboratories, Inc.

Localized galvanic corrosion of coated carbon steel rake mechanisms at stainless steel bolted connections can result in significantly high corrosion rates, particularly when connections are overtightened in gravity sludge thickeners and clarifiers. This article explains this issue and presents a typical case history to demonstrate successful measures that can be taken to prevent this prevalent problem.


OAP Coating and Lining Systems: For Petroleum and Water Storage Tanks

by Deborah V. Simmons (Retired), Johnny C. Pourciau and Murray Heywood, Sherwin-Williams Protective & Marine

The use of coating systems formulated with optically active pigments can help to ensure correct application and inspection of interior linings for petroleum and water storage tanks. This article explains how OAP technology can help identify pinholes, eliminate holidays and reduce premature failures often caused by inadequate film thickness on angles, edges or areas that are difficult to inspect.


Field Testing for Soluble Salts: A Problem to Be Aware Of

by Simon Hope, Auquharney Associates Ltd.

The presence of soluble salts on a surface is a major factor in premature breakdown of protective coatings, and resultant increased maintenance costs for the asset owner. This article explains why the presence of salts are a problem, how to measure for salts on a surface, industry standards on the subject and the results of a case study involving salt detection and removal.


   
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