[Tagging] fire hydrants

Richard Welty rwelty at averillpark.net
Wed Jun 14 23:32:20 UTC 2017

an american usage note:

the "standard" hydrant in the US has 2 x 2.5" hose connections
and 1 x 4.5" pumper connection. other sizes have existed in the

the wrench required for the bolt at the top of a dry hydrant may vary,
pentagonal bolts are most common but others have been used.
this is something that a mapper can observe, and something that
a fireman cares about.

On 6/14/17 6:52 PM, Robert Koch wrote:
> Hello Alberto,
> I like your remarks and would like to work together to improve things.
> On 2017-06-14 19:06, Viking wrote:
>>> in OsmHydrant [1] there is already fire_hydrant:coupling_type with various values from Storz to Barcelona
>>> (https://taginfo.openstreetmap.org/keys/fire_hydrant:coupling_type). Then there is fire_hydrant:couplings to complement that, describing the > actual connectors: https://taginfo.openstreetmap.org/keys/fire_hydrant%3Acouplings
>>> This implementation might not be the best for various reasons, but we could consolidate its structure/values if needed.
>>> [1] https://www.osmhydrant.org/en/
>> It is a bad implementation: first of all because there is no reference on hydrants wiki page (and indeed I didn't know it) and consequentely there is a wide range of heterogeneous values that are almost useless for automatic data search.
>> By the way, let's try to improve these existing tags.
>> fire_hydrant:coupling_type indicates the standard (UNI, Storz,...)
>> fire_hydrant:couplings indicates the number and diameters.
>> Right?
> Right!
>> First question: is it possible that the same hydrant has different coupling types, for example Storz and UNI? I know that in Italy, where I work as fireman, this is not possible, so a single value in fire_hydrant:coupling_type is enough.
> In Austria I've only seen hydrants with one connector type (mostly Storz). S
>> Second question: how would you indicate the number of couplings? For example an hydrant with two UNI 45 mm couplings and one UNI 70 mm coupling would be:
>> fire_hydrant:coupling_type=UNI
>> fire_hydrant:couplings=45;45;70
>> OR
>> fire_hydrant:couplings=2 x 45;70
>> OR...?
> So far it was really up to the contributor on OsmHydrant but the
> recommended way in this case have been so far:
> fire_hydrant:couplings=2x45/1x70
> Before going on, I've to explain the rationale behind using that scheme
> first. In Austria we're using character A for 110mm diameter, B for for
> 75mm and C for either 52 (or 42). In this case it looks easily readable:
> "1B/2C" or "1A/2B".
> When it comes to "2x45/1x70" I totally agree that "45;45;70" is much
> better. Back in time when doing the implementation for OsmHydrant, I
> didn't know about using the semicolon to split values, but I like it
> more than the forward slash.
> Coming back to the Austrian "1A/2B" I would additionally allow using
> these characters instead of diameter values as well resulting in: "A;B;B"
> If the proposal is accepted I'd propose migrating all values
> automatically and changing OsmHydrant. Your scheme with repeating the
> diameter is much better readable & parse-able by humans & tools.
> Best regards,
> Robert
>> I would prefer 45;45;70 because it's more explicit and less prone to errors.
>> The use of semicolons to separate different values is commonly accepted on the wiki.
>> Alberto
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