[Tagging] Clarification of fire_hydrant:diameter

[François Lacombe]

It should be said that internal diameter physically change over time and
operational status of pipes.

Nominal diameter is theoretical value that is expressed in precise pressure
and temperature conditions and true at anytime.
It should be used on OSM since we prefer static data and +1 with Martin
"it's written on it".

All the best

François

Le ven. 25 janv. 2019 à 11:07, Martin Koppenhoefer <dieterdreist at gmail.com>
a écrit :

>
>
> 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).
>
> Cheers,
> Martin
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