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DN stands for diameter nominal !! it has been taken from some language which say diamteree nominelle
Above 4-1/2 inch is called Casing.Below 4-1/2 inch is called Tubing.Both measured by Internal Diameter.CASING-Is a large diameter pipe that is assembled and inserted into a recently drilled section of a boreholeTUBING - Small diameter pipe which is installed in the casing. Oil is produced through tubing because it increases the viscosity of fluid and a well's flow capabilities
Natural casing which is most common is made from pig intestines which has been flushed throughly. They also have synthetic casing though.
"Module" is the unit of size that indicates how big or small a gear is. It is the ratio of the reference diameter of the gear divided by the number of teeth. Thus:    (Module = Reference diameter ───────── Number of teeth )
The buoyed weight of the casing above the cement top.