SPRING CITY DUCTILE WARRANTY
Spring City warrants its ductile iron lamppost and
ductile iron bases to be free from defects in materials and workmanship under
normal use and operation for 25 years (AASHTO minimum design life for luminaire
support structures  less than 15
meters). The definition of “normal use” includes damage resulting from motor
vehicles traveling at posted speed limits colliding with the lamppost.
Upon receipt of proper notification from the owner,
Spring City will replace any lamppost found to be defective or damaged within
the warranty period. Spring City shall not be liable or responsible for labor
charges or other expenses involved in the removal or disposal of the original
product or the installation of the replacement product. Spring City’s liability
hereunder is limited to replacing the defective or damaged lamppost.
Why choose ductile iron?
Ductile iron, also called ductile cast iron or nodular
cast iron, is a type of cast iron invented in 1942. The increased ductility is
achieved through complex metallurgy and higher pouring temperatures. Magnesium
is added to molten cast iron, which cause the graphite in the iron to solidify
in round nodules instead the flacks in regular gray iron. Ductile Iron has been
successful because it offers a combination of versatility and properties not
available in any of its rivals. Its castability, machinability, damping
properties, and economy of prod  uction
are almost equal to those for which Gray Iron is famous, but its mechanical
properties - strength, wear resistance, fatigue strength, toughness and
ductility are competitive with many cast, forged and fabricated steel
components.
The American Association of State Highway and
Transportation Officials (AASHTO) are the nationally recognized standards
organization for the analysis of lighting structures. They acknowledge the
bending strength of ductile iron to be 3 to 4 times that of cast aluminum and
grey iron. If your application requires, or may require some time in the
future, banner arms, signage, flags or other significant load requirements
ductile iron will probably be the only material that will meet the AASHTO wind
loading requirements. Please be sure to require the manufacturer of your chosen
light standard to supply calculations for your specific application.
For complete details, please download PDF
file
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