Water Science & Technology: Water Supply Vol 1 No 3 pp 83–90 © IWA Publishing 2001
Metallic materials in Danish supply water systems
K. Nielsen
FORCE Institute, Department of Corrosion, Park Allé 345, DK-2605 Broendby, Denmark
ABSTRACT
Characteristic corrosion phenomena and materials selection in hard
supply water areas in Denmark are reviewed. Both corrosion failures and metal
release are described. Even though good protective layers can be formed in
the majority of cast iron pipes, the ease of installation and the corrosion
resistance of plastic pipes result in the use of medium- and high-density
polyethylene and polyvinylchloride (PEM, PEH and PVC) for new pipes. Corrosion
is problematic in domestic pipes. Due to localised corrosion, selective
attack of the zinc-layer and zinc release, galvanised steel gives too many
problems. The copper release from copper pipes is too high after
stagnation. The tendency is to preferentially use the more resistant
materials such as stainless steel and crosslinked polyethylene (PEX), for
domestic pipes. Possible higher microbial growths in plastic pipes are under
investigation.
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