A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Corrosion of stainless steels in potable water systems
The dissolved metal content of potable water is strictly controlled, however biofilms (the growth of bacterial and other organisms on surfaces) are known to concentrate metal ions from the water that flows over them. In time such trace metal accumulation can become potentially hazardous should the biofilm slough off the metal surface. In recent years there has been an increase in the use of stainless steel for potable water systems. It has been reported that stainless steel will leach some metal ions from its structure in the initial commissioning of a system but little is known about the interaction of this leaching with biofilm development. There are occasions when water in domestic plumbing systems is not used for long periods of time leading to stagnation of water and a risk of corrosion of stainless steel in low oxygen conditions. The stagnation of water can occur through the existence of deadlegs when water is left in the system for extended periods of time following pressure testing before the system goes into operation. Overall, metal ions are leaching from stainless steel in very low amounts. The highest detectable levels of metal ion leached from stainless steel into stagnant water and/or biofilm were iron, then molybdenum, nickel and finally chromium. It seems unlikely that the metal ions detected both within biofilms and flowing/stagnant water would affect the suitability of stainless steel pipework in potable water supplies but the results indicate the care needed in ensuring systems are flushed out properly, particularly after biocide treatment.
Corrosion of stainless steels in potable water systems
The dissolved metal content of potable water is strictly controlled, however biofilms (the growth of bacterial and other organisms on surfaces) are known to concentrate metal ions from the water that flows over them. In time such trace metal accumulation can become potentially hazardous should the biofilm slough off the metal surface. In recent years there has been an increase in the use of stainless steel for potable water systems. It has been reported that stainless steel will leach some metal ions from its structure in the initial commissioning of a system but little is known about the interaction of this leaching with biofilm development. There are occasions when water in domestic plumbing systems is not used for long periods of time leading to stagnation of water and a risk of corrosion of stainless steel in low oxygen conditions. The stagnation of water can occur through the existence of deadlegs when water is left in the system for extended periods of time following pressure testing before the system goes into operation. Overall, metal ions are leaching from stainless steel in very low amounts. The highest detectable levels of metal ion leached from stainless steel into stagnant water and/or biofilm were iron, then molybdenum, nickel and finally chromium. It seems unlikely that the metal ions detected both within biofilms and flowing/stagnant water would affect the suitability of stainless steel pipework in potable water supplies but the results indicate the care needed in ensuring systems are flushed out properly, particularly after biocide treatment.
Corrosion of stainless steels in potable water systems
Percival, S.L. (author) / Edyvean, R.G.J. (author) / Beech, I.B. (author) / Videla, H.A. (author)
2000
6 Seiten, 29 Quellen
Conference paper
Storage medium
English
Corrosion control in potable water systems
| Engineering Index Backfile | 1945
Potable‐Water Corrosion Control
| Wiley | 1974
| Wiley | 1975
Corrosion of Metals in Potable Water Systems
| Wiley | 1967
Stainless steel for potable water service
| Tema Archive | 1996