[Tagging] Clarification of fire_hydrant:diameter

Marc Gemis marc.gemis at gmail.com
Fri Jan 25 09:52:34 UTC 2019

Perhaps it's my fault, I just found

DN = Diameter Nominal. The term Diameter Nominal refers to the
internaldiameter of a pipe. Together with the nominal pressure rating
and the materials class, all dimensions of a piping line, e. g. flange
dimensions, are defined by indicating the nominal diameter. Steel is
often not specified, but assumed as material.

So perhaps I should have translated binnendiameter to "internaldiameter" ?


On Fri, Jan 25, 2019 at 10:41 AM François Lacombe
<fl.infosreseaux at gmail.com> wrote:
> 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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