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The Gothenburg Water and Sewage works serves about
450,000 inhabitants and industries. Water is taken from the Göta river and after
treatment in two plants distributed in a network, 1750 meters in length.
Traditionally cast iron pipes have been used
but in 1970 ductile iron pipes were introduced. The soil consists of either rock, glacial
clay with a high salt content. Corrosion is a well-known phenomenon and many old pipes
have been exchanged over the years, but still there are a considerable number of pipes
from the last century in service. Typically, there have been
300-400 failures with these pipes on the main network every year.
In 1986, however, new pipes were coated in
thermoplastics and in the last few years in Plascoat PPA 571. Since this change 80 kms of
pipe has been installed and so far there has been no instance of failure or corrosion with
these pipes.
As a result of this experience, and of
controlled tests by the Swedish Corrosion Institute, Plascoat PPA 571 is
now being increasingly used for the coating of ductile iron pipes,
fittings and hydrants around the world – including the USA (Seattle).
PPA
571 Data Sheet
Independent report for insurance-based
guarantee for PPA 571ES coated items
Example:
Sigma Commercial Products
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