Problem
Although the concerned substrate is made out of a special corrosion resistant high-grade steel type, a gas washer located in a refinery showed considerable corrosion damages in several areas due to severe chemical and thermal exposures.

Parameter

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Explanations
The aim of the gas washer is to process the streaming sour natural gas by means of supply of MDEA in certain concentrations of sulphur hydrogen and carbon dioxide for the further transportation according to the pipeline standards (keyword "sweetening"). Corrosion caused by the combination of high working temperatures, pressure and the reaction of different agents and chemicals is not unusual at such constructions. Due to the long-term demands at various areas of the plant within scheduled inspections a high intensity of the corrosion damages was detected and finally it was necessary to initiate a repair procedure.

A repair by current welding methods is problematic due to the error rate at the demanding performing welding works and the necessary accompanying heat treatment after the welding (keyword stress crack, intergranulare corrosion, PWHT post weld heat treatment). Besides the damaged areas are rather huge (see also standard NACE RP0472-2000 & API Recommended Practice 582, Welding Guidelines for the Chemical, Oil and gas Industries).

For the first time trial coatings of approx. 40 kg Ceramium CH and Hardener CH1 were carried out in some damaged areas of the plant in an average layer strength of 3 mm.

A visual inspection of the coated areas approx. half a year later was positive and it was decided to order bigger quantities of Ceramium CH / Hardener CH1 for the coating of other damaged areas of the plant.

Resumée
The research of MultiMetall has succeeded in developing with Ceramium CH a PolymerCeramic which possesses a very high chemical permanence. Only with the suitable know-how the production of such a material is possible.

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		Inspektionsreport mit einer Zustandsbeschreibung verschiedener Sektionen und Ursachen der Schäden vom Juni 2008 zusammen mit einem Zustandsbericht der Beschichtung vom Mai 2009. Beide Berichte wurden uns freundlicherweise vom leitenden Ingenieur der Raffinerie zur Verfügung gestellt. Kontaktieren Sie uns zwecks Anforderung obiger Informationen!
		Inspection report with a description of the condition of various sections and origins of the damages from June 2008 together with a status report about the coating from May 2009. Both reports were friendly provided by the principal engineer. and can be allocated upon request. Please contact us for the request of above information!