A case study on corrosion of stainless steel in firewater mains

Leena Carpén, Thomas Ohligschläger

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Traditionally, many firewater mains were made of carbon steel or cast iron. At present, more and more stainless steel is used as material for firewater pipes due to usually better corrosion resistance in natural waters than iron or carbon steel. In some few cases, however, unexpected corrosion failures in systems using austenitic stainless steels were observed only after a relatively short time of usage ranging from a few weeks to a few years. Most of these corrosion damages were found on the weld nuggets or in the heat-affected zones of on-site girth welds. One of the most important factors affecting the corrosion resistance of stainless steel at welds and in heataffected zones are the surface oxide films originating from the welding heat in the presence of oxygen (heat tints). Therefore, proper root shielding is important especially when welding pipes for fire protection systems where the water is taken from natural sources (e.g. from rivers, lakes or tap water), as microbially induced corrosion (MIC) can increase the risk for corrosion damages significantly. Two failure cases in fire protection systems, one in a stainless steel factory and one in a power plant have been studied and are described in this paper. A proposal for the mechanism is suggested and general recommendations how to avoid or diminish the risk for unexpected localised corrosion failures are given.
Original languageEnglish
Title of host publication6th European stainless steel conference
Subtitle of host publicationScience and market
PublisherJernkontoret
Pages129-136
ISBN (Print)9789197413190
Publication statusPublished - 2008
MoE publication typeA4 Article in a conference publication
Event6th European stainless steel conference: Science and market - Helsinki, Finland
Duration: 10 Jun 200813 Jun 2008

Conference

Conference6th European stainless steel conference
CountryFinland
CityHelsinki
Period10/06/0813/06/08

Fingerprint

Stainless steel
Corrosion
Welds
Fire protection
Carbon steel
Corrosion resistance
Welding
Pipe
Water
Heat affected zone
Austenitic stainless steel
Cast iron
Shielding
Oxide films
Lakes
Industrial plants
Power plants
Rivers
Iron
Oxygen

Cite this

Carpén, L., & Ohligschläger, T. (2008). A case study on corrosion of stainless steel in firewater mains. In 6th European stainless steel conference: Science and market (pp. 129-136). Jernkontoret.
Carpén, Leena ; Ohligschläger, Thomas. / A case study on corrosion of stainless steel in firewater mains. 6th European stainless steel conference: Science and market. Jernkontoret, 2008. pp. 129-136
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Carpén, L & Ohligschläger, T 2008, A case study on corrosion of stainless steel in firewater mains. in 6th European stainless steel conference: Science and market. Jernkontoret, pp. 129-136, 6th European stainless steel conference, Helsinki, Finland, 10/06/08.

A case study on corrosion of stainless steel in firewater mains. / Carpén, Leena; Ohligschläger, Thomas.

6th European stainless steel conference: Science and market. Jernkontoret, 2008. p. 129-136.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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N2 - Traditionally, many firewater mains were made of carbon steel or cast iron. At present, more and more stainless steel is used as material for firewater pipes due to usually better corrosion resistance in natural waters than iron or carbon steel. In some few cases, however, unexpected corrosion failures in systems using austenitic stainless steels were observed only after a relatively short time of usage ranging from a few weeks to a few years. Most of these corrosion damages were found on the weld nuggets or in the heat-affected zones of on-site girth welds. One of the most important factors affecting the corrosion resistance of stainless steel at welds and in heataffected zones are the surface oxide films originating from the welding heat in the presence of oxygen (heat tints). Therefore, proper root shielding is important especially when welding pipes for fire protection systems where the water is taken from natural sources (e.g. from rivers, lakes or tap water), as microbially induced corrosion (MIC) can increase the risk for corrosion damages significantly. Two failure cases in fire protection systems, one in a stainless steel factory and one in a power plant have been studied and are described in this paper. A proposal for the mechanism is suggested and general recommendations how to avoid or diminish the risk for unexpected localised corrosion failures are given.

AB - Traditionally, many firewater mains were made of carbon steel or cast iron. At present, more and more stainless steel is used as material for firewater pipes due to usually better corrosion resistance in natural waters than iron or carbon steel. In some few cases, however, unexpected corrosion failures in systems using austenitic stainless steels were observed only after a relatively short time of usage ranging from a few weeks to a few years. Most of these corrosion damages were found on the weld nuggets or in the heat-affected zones of on-site girth welds. One of the most important factors affecting the corrosion resistance of stainless steel at welds and in heataffected zones are the surface oxide films originating from the welding heat in the presence of oxygen (heat tints). Therefore, proper root shielding is important especially when welding pipes for fire protection systems where the water is taken from natural sources (e.g. from rivers, lakes or tap water), as microbially induced corrosion (MIC) can increase the risk for corrosion damages significantly. Two failure cases in fire protection systems, one in a stainless steel factory and one in a power plant have been studied and are described in this paper. A proposal for the mechanism is suggested and general recommendations how to avoid or diminish the risk for unexpected localised corrosion failures are given.

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Carpén L, Ohligschläger T. A case study on corrosion of stainless steel in firewater mains. In 6th European stainless steel conference: Science and market. Jernkontoret. 2008. p. 129-136