What is the difference between Thickness Class & Pressure Class Ductile Iron Pipe?
• The basic difference is a change in terminology in how Ductile Iron is classified under the specifications. The design and manufacturing requirements have not changed since 1976. The difference between the two is the thickness classes have no particular meaning, while the pressure classes define the actual working pressure of the pipe. This allows the end user to specify a pipe that meets the design requirements of a given pipeline. Ductile Iron is still the most conservatively designed pipe in the water works industry.
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