Monitoring the operation of Cathodic Protection (CP) systems on 39,000km (22,000 miles) of pipeline through site visits and manual reading is a time consuming and costly task. (Figure 1) Of the 1300 plus rectifies sites in the subject pipeline network, more than 40 sites are […]
Another successful application is described in this article of the rapidly expanding technique of anodic protection. This report deals with kraft digesters in pulp and paper manufacturing. In the manufacture of sulfate or kraft paper products, the first stage is reduction of wood chips to […]
Copper grounding has a detrimental effect on cathodic protection (CP) of interconnected underground carbon steel piping. The copper can consume large amounts of protection current as well as introducing significant measurement errors when verifying the protection level of the piping. This paper examines the interaction […]
Austenitic chromium-nickel-molybdenum-iron alloys (904L 316L 317 L, etc.) used to construct Flue Gas Desulfurization (FGD) scrubbers and associated equipment in coal fired generating stations can experience localized corrosion. The problem may be alleviated by using more costly materials such as higher grades of stainless steel […]
Anodic protection systems have been installed in eight hydraulic continuous digesters and one impregnation vessel. Results indicate that corrosion and caustic cracking have been mitigated by the application of anodic protection. Operating characteristics, hardware improvements and digester inspection results are discussed. Potential and coupon monitoring […]
Anodic protection (AP) is powerful technique for corrosion mitigation of white and green liquor tankage. Recent improvements are discussed. The use of Distributed Current Sources (DCS) resulted in decrease of: 1) mill personnel involvement 2) logistical hurdles for repassivation 3) DC cabling costs Current distribution […]
Use of Electrochemical protection systems (Cathodic, Papritection® and Anodic) has significantly increased during the last decade. Cathodic protection has been routinely installed on underground structures such as pipelines and storage tanks however, the use of electrochemical protection systems has now gained acceptance to protect the […]
Flue Gas Desulfurization (FGD) scrubbers made of Al-6XN® super-austenitic stainless steel experienced premature through wall corrosion failure after 18 months of operation. Multiple remedial methods were evaluated A PAPTM electrochemical corrosion prevention system supplied by Corrosion Service Company Limited was chosen and installed in the […]
Anodic protection is a powerful technique used to mitigate liquor tankage corrosion. The large currents required to protect a typical vessel led to problems in the first generation of commercial systems. This article describes what caused the problems. Part II (March 2002 MP) will discuss […]
Corrosion is best defined as “the process by which a material, usually a metal, combines with certain elements within its environment to produce a product that does not retain the useful properties of the original material”. Unfortunately, this seemingly innocuous textbook definition does not convey […]
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