Corrosion of copper alloy fittings in a combined plastic/metal installation for hot drinking water

  • A household installation for drinking water was analysed for the water quality after an incident concerning the water distribution system in the city. Chemical analysis showed very high levels of lead in the hot water circulation system. The installation was made from multi-layer-pipes, the hot water tank from stainless steel, no obvious source of lead could be determined. After a thorough cleaning of the piping system and the tank the lead levels rose again after short time. - INVESTIGATIONS: Water samples and samples of the pipe connectors made from different copper alloys were taken during an inspection of the building. Results for water analysis and metallographic investigations of the samples are given. Close examination of the connectors showed selective corrosion along the grain boundaries for the connectors made from brass but not for the connectors made from gun metal. - RESULTS: The lead found in the hot drinking water war released from the brass connectors. Obviously theA household installation for drinking water was analysed for the water quality after an incident concerning the water distribution system in the city. Chemical analysis showed very high levels of lead in the hot water circulation system. The installation was made from multi-layer-pipes, the hot water tank from stainless steel, no obvious source of lead could be determined. After a thorough cleaning of the piping system and the tank the lead levels rose again after short time. - INVESTIGATIONS: Water samples and samples of the pipe connectors made from different copper alloys were taken during an inspection of the building. Results for water analysis and metallographic investigations of the samples are given. Close examination of the connectors showed selective corrosion along the grain boundaries for the connectors made from brass but not for the connectors made from gun metal. - RESULTS: The lead found in the hot drinking water war released from the brass connectors. Obviously the contact time of the water with the metal surfaces in the system investigated was much longer as the contact times used for the evaluation of metallic materials according to EN 15664-1. The standards for the dimensioning of hot water circulation systems available are outdated and do not consider retention time in the system but are driven by maximum availability of hot water at any time.zeige mehrzeige weniger

Metadaten exportieren

Weitere Dienste

Suche bei Google Scholar Anzahl der Zugriffe auf dieses Dokument
Metadaten
Autor*innen:Johann Wilhelm Erning
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):EUROCORR 2014 - European corrosion congress
Jahr der Erstveröffentlichung:2014
Herausgeber (Institution):DECHEMA e.V.
Erste Seite:Chapter 16, Paper 7183, 1
Letzte Seite:5
Veranstaltung:EUROCORR 2014 - European corrosion congress
Veranstaltungsort:Pisa, Italy
Beginndatum der Veranstaltung:2014-09-08
Enddatum der Veranstaltung:2014-09-12
ISBN:978-3-89746-159-8
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:02.10.2014
Einverstanden
Diese Webseite verwendet technisch erforderliche Session-Cookies. Durch die weitere Nutzung der Webseite stimmen Sie diesem zu. Unsere Datenschutzerklärung finden Sie hier.