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Corrosion of welded steel piping in domestic hot water: A case history. Corrosion de una instalacion de tubos soldados de acero galvanizado para agua caliente

Journal Article:

Abstract

Many leaks had occurred after seven years of service in the hot sanitary water system of building. The results of the failure analysis have led to the conclusion that the reduced life of the piping system was primarily promoted by the use of a dissimilar metal (galvanized steel-copper) installation and by an excessive service temperature. Through precuations were taking to electrically insulate both types of tubing by employing dielectric fittings and water flow followed the ''rule of flow'' (zinc[yields] copper), an indirect galvanic attach on galvanized steel took place. Localized corrosion was originated by microcells formed by plating out of soluble copper. Corrosive attack was most severe at weld seams. The microstructure of the weld zone was very different from that of the surrounding pipe. In addition, some pipes presented signs of incomplete fusion (welding without filling metal) and others had protruding weld seams which produced crevice attack and erosion-corrosion, respectively. Author (10 refs.)
Publication Date:
Jan 01, 1993
Product Type:
Journal Article
Reference Number:
SP-93-000361; EDB-94-019464
Resource Relation:
Journal Name: Revista de Soldadura; (Spain); Journal Volume: 23:3
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; ELECTROCHEMICAL CORROSION; HOT WATER; PIPES; CORROSION; DISTRICT HEATING; LEAKS; WELDED JOINTS; CHEMICAL REACTIONS; HEATING; HYDROGEN COMPOUNDS; JOINTS; OXYGEN COMPOUNDS; WATER; 360105* - Metals & Alloys- Corrosion & Erosion; 420500 - Engineering- Materials Testing
OSTI ID:
5654969
Country of Origin:
Spain
Language:
Spanish
Other Identifying Numbers:
Journal ID: ISSN 0048-7759; CODEN: RSLDB6
Submitting Site:
SP
Size:
Pages: 136-142
Announcement Date:

Journal Article:

Citation Formats

Herrera, E J, Soria, L, and Gallardo, J M. Corrosion of welded steel piping in domestic hot water: A case history. Corrosion de una instalacion de tubos soldados de acero galvanizado para agua caliente. Spain: N. p., 1993. Web.
Herrera, E J, Soria, L, & Gallardo, J M. Corrosion of welded steel piping in domestic hot water: A case history. Corrosion de una instalacion de tubos soldados de acero galvanizado para agua caliente. Spain.
Herrera, E J, Soria, L, and Gallardo, J M. 1993. "Corrosion of welded steel piping in domestic hot water: A case history. Corrosion de una instalacion de tubos soldados de acero galvanizado para agua caliente." Spain.
@misc{etde_5654969,
title = {Corrosion of welded steel piping in domestic hot water: A case history. Corrosion de una instalacion de tubos soldados de acero galvanizado para agua caliente}
author = {Herrera, E J, Soria, L, and Gallardo, J M}
abstractNote = {Many leaks had occurred after seven years of service in the hot sanitary water system of building. The results of the failure analysis have led to the conclusion that the reduced life of the piping system was primarily promoted by the use of a dissimilar metal (galvanized steel-copper) installation and by an excessive service temperature. Through precuations were taking to electrically insulate both types of tubing by employing dielectric fittings and water flow followed the ''rule of flow'' (zinc[yields] copper), an indirect galvanic attach on galvanized steel took place. Localized corrosion was originated by microcells formed by plating out of soluble copper. Corrosive attack was most severe at weld seams. The microstructure of the weld zone was very different from that of the surrounding pipe. In addition, some pipes presented signs of incomplete fusion (welding without filling metal) and others had protruding weld seams which produced crevice attack and erosion-corrosion, respectively. Author (10 refs.)}
journal = {Revista de Soldadura; (Spain)}
volume = {23:3}
journal type = {AC}
place = {Spain}
year = {1993}
month = {Jan}
}