 |
|
|
| |
|
|
|
|
|
Monday 12 June 2006
NEW GENERATION OF PB-FREE GALVANIZED TUBES COMPLYING WITH THE EC 98/83 DIRECTIVE ON QUALITY OF WATER FOR HUMAN CONSUMPTION
L. Tortoreto, M. Memmi*, M. Bodineau **
*Surface Srl, Italy
**ESTA, France
Referee: V. Ferrari / F. Mancia
Paper presented to: Intergalva 2006
Napoli, 12-14 June 2006
New rules are going to be established in the entire EC to regulate the use of Construction Products in contact with Drinking Water (CPDW), with a common set of directives and testing procedures (EAS, European Acceptance Scheme) replacing the national regulations for the acceptance of CPDW.
Current proposals for approving the use of galvanized tubes are based on data collected with tubes coated with the old Zn-1% w Pb alloy. However, most of the piping Industry within the EU currently uses Zn-alloys containing very low Pb (<0.1%), aiming at the progressive complete elimination of the Pb from the galvanizing process.
This research program aims at up-dating the knowledge on the behavior of the galvanized tubes in contact with drinking water, with reference to the new low-Pb coatings and to the new testing method proposed for the EAS.
Two rigs were built with galvanized pipes supplied by 3 Italian galvanizers, representative of the current UE galvanizing technology and then installed in 2 different Italian sites with different waters. The rigs were run for about 130 weeks with a continuous alternation of stagnation and flow periods, according to the draft Norm suggested by CEN (WG3/TC164), and measuring on a regular base the water parameters and the metal release from the tubes of the various rigs at different stagnation times.
|
|
|
|
|
|
|
|
|
|
|
 |