[Tagging] Clarification of fire_hydrant:diameter

Martin Koppenhoefer dieterdreist at gmail.com
Fri Jan 25 10:05:09 UTC 2019

Am Fr., 25. Jan. 2019 um 10:55 Uhr schrieb Marc Gemis <marc.gemis at gmail.com

> Perhaps it's my fault, I just found
> DN = Diameter Nominal. The term Diameter Nominal refers to the
> internaldiameter of a pipe.

it refers to the nominal diameter, which corrisponds roughly to the
internal diameter, but not exactly. You could look up the exact
measurements in the standards which describe the thing, if you know which
standard applies (for which use the pipe is standardized).

In OSM we should use the term "nominal diameter" or "DN" and not "internal
diameter", because this is easy to find out (is written on it).

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