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Sealed joints with regard to corrosive processes
Using typical examples, the author gives a survey about corrosion and corrosion mechanism of static seals and packings. Corrosive processes at statically and dynamically sealed joints in pipelines, pumps, valves and vessels cause avoidable costs and reduce operational safety and service life of plants. The manifestation of corrosion have been divided into three main types: crevice corrosion, contact corrosion and electrochemical corrosion. By selecting appropriate sealing materials and sealing designs corrosion at sealed joints can be considerably reduced. When mounting the sealing material care should be taken to ensure sufficient and uniform contact pressure between metallic sealing surface and sealing material as well as the use of sealing auxiliaries, eg. adhesives, 'release pastes' or lubricants, without corrosive secondary reactions under industrial conditions. Some corrosion problems could be avoided by using high purity Flexible Graphite. It's recommended to take attention to Halogen content and Sulfur content of sealing material. For Packings made of Flexible Graphite there are specific 'Anticorrosion' - grades available with low Sulfur content as well as with inhibitors on the basis of Bariummolybdate.
Sealed joints with regard to corrosive processes
Using typical examples, the author gives a survey about corrosion and corrosion mechanism of static seals and packings. Corrosive processes at statically and dynamically sealed joints in pipelines, pumps, valves and vessels cause avoidable costs and reduce operational safety and service life of plants. The manifestation of corrosion have been divided into three main types: crevice corrosion, contact corrosion and electrochemical corrosion. By selecting appropriate sealing materials and sealing designs corrosion at sealed joints can be considerably reduced. When mounting the sealing material care should be taken to ensure sufficient and uniform contact pressure between metallic sealing surface and sealing material as well as the use of sealing auxiliaries, eg. adhesives, 'release pastes' or lubricants, without corrosive secondary reactions under industrial conditions. Some corrosion problems could be avoided by using high purity Flexible Graphite. It's recommended to take attention to Halogen content and Sulfur content of sealing material. For Packings made of Flexible Graphite there are specific 'Anticorrosion' - grades available with low Sulfur content as well as with inhibitors on the basis of Bariummolybdate.
Sealed joints with regard to corrosive processes
Hirschvogel, A. (author)
1998
7 Seiten
Conference paper
English
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