11170 Rolled Lined Corrosion Resistant Steel Pipes in Geothermal Environment: Investigation and Results of Field Tests

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Product Number: 51300-11170-SG

ISBN: 2011 11170 CP

Author: Ulrich Schnaut, George Furmanski, Kam Dianatkhah, Bernd Berg

Publication Date: 2011

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In order to meet the severe corrosion requirements of the geothermal power plant environment, a new type of corrosion resistant rolled lined steel pipes was tested in the laboratory and geothermal field. The rolled lined steel pipe with a corrosion resistant alloy liner provides reliable and cost-efficient solutions to the prevailing types of stress corrosion cracking (SCC), erosion corrosion and pitting corrosion. This innovative and efficient lined pipe manufacturing process allows for the first time application of liner materials with a substantial level of grip such as duplex stainless steel (UNS S32205), super duplex stainless steel (UNS S32507) as well as Alloy 625 (UNS N06625) without any strength reducing heat treatment. The corrosion resistant performance of rolled lined pipes is a result of the excellent mechanical bonding with high gripping force between the liner material and carbon steel. The liner ensures full corrosion and erosion resistance and the backing steel provides the mechanical properties such as pressure resistance. After a short description of the innovative pipe manufacturing process, this paper will present results and data provided by Scanning Electron Microscopy (SEM), X-ray fluorescence (XRF) and discusses the corrosive elements in the geothermal brine, as well as scaling products. This test program covers the field corrosion performance of the bi-metallic corrosion resistant pipes under real conditions. Laboratory tests were conducted to identify the corrosive nature of the geothermal environment and analysis of scaling products and tendencies.

Key words: Corrosion Resistant Alloy (CRA), CRA lined steel pipe, duplex, (UNS S32205), super duplex, (UNS S32507), geothermal energy