[Tagging] Clarification of fire_hydrant:diameter

[François Lacombe]

Hi Marc

Le ven. 25 janv. 2019 à 09:07, Marc Gemis <marc.gemis at gmail.com> a écrit :

> In Belgium it is the inner diameter of the water main. Lowest value
> I've seen is 50, highest 400 or so.
>

Are you sure it's the inner diameter instead of the nominal diameter?
They're not always equals

ISO 6708 defines the nominal diameter (DN) and it is way more used in
plumbing than the internal one.
https://www.techstreet.com/standards/din-en-iso-6708?product_id=1072836

OSM diameter=* regards the nominal diameter
https://wiki.openstreetmap.org/wiki/Key:diameter

All the best
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