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Ductile iron pipe is sized according to a dimensionless term known as the Pipe Size or Nominal Diameter (known by its French abbreviation, DN).
This is roughly
equivalent to the pipe's internal diameter in inches or millimeters. However,
it is the external diameter of the pipe that is kept constant between changes
in wall thickness, in order to maintain compatibility in joints and fittings.
Consequently, the internal diameter varies, sometimes significantly, from its
nominal size.
·
Ductile iron has excellent
properties of machinability, impact resistance.
·
high wear and tear resistance.
·
high tensile strength, ductility,
and corrosion resistance.
·
It is strong, both the inner and
outer surfaces are smooth, free from lumps, blisters, and scars.
·
These pipes are free from cracks.
·
Ductile pipes stand up to hydraulic
pressure tests are required by service regulations.
·
These pipes are approximately 30 %
lighter than conventional cast-iron pipes.
·
The use of ductile iron pipes in
water mains may lead to saving in the cost of water supply projects.
