This research analyzed corrosion and corrosion
control of ductile- and gray-iron pipe by drawing on a
large database of 1,379 pipe specimens and inspections
derived from the test programs of the Ductile Iron Pipe
Research Association. The study's objectives were
twofold: evaluate the accuracy of the 10-point soil
evaluation system published in the ANSI/AWWA Standard
for Polyethylene Encasement for Ductile-Iron Pipe
Systems; and, assess the effectiveness of polyethylene
encasement for corrosion control of ductile-iron pipe.
Study findings indicated that the 10-point system is
an accurate method for evaluating the corrosivity of
soils and predicting whether corrosion protection is
warranted. In less-aggressive soils, asphaltic ductile-iron
pipe did not require additional corrosion protection.
Polyethylene encasement controlled corrosion in
all soils tested except severe environments and, when
properly installed, provided protection beyond the
design life of the pipe.
Water suppliers can use the 10-point evaluation system
to assess the corrosivity of soils where pipe will be
buried. For those soils where corrosion control protection
is warranted, polyethylene encasement provides an effective,
economical, and low-maintenance solution. Includes 15 references, tables, figures.
| Edition : | Vol. 97 - No. 6 |
| File Size : | 1
file
, 320 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 06/01/2005 |
