[Tagging] fire hydrants

Robert Koch robert.koch at loggia.at
Thu Jun 15 14:57:59 UTC 2017

According to this wiki entry:

it would be:


If not given, a default unit could be specified by the wiki entry (based
on official SI units; therefore metric).
Alternatively we could tell people to always use a unit value to avoid
mistakes on this tag.

On 2017-06-15 15:09, Richard Welty wrote:
> On 6/15/17 8:38 AM, Robert Koch wrote:
>> Hello Richard,
>> On 2017-06-15 01:32, Richard Welty wrote:
>>> 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
>>> past.
>> Which coupling-type do you use? NST
>> (https://en.wikipedia.org/wiki/Hose_coupling#NST)?
> generally NST. the standardization effort in the US started immediately
> after the catastrophic 1904 Baltimore high rise fire. companies coming
> in from outside of the city found out that their equipement couldn't hook
> up.
>> If so one would describe this hydrant as:
>>     fire_hydrant:coupling_type=NST
>>     fire_hydrant:couplings=2.5;2.5;4.5
>> Open: How do we reflect the unit? Millimetres won't work for the US.
>> Possibilities:
>>     fire_hydrant:couplings=2.5";2.5";4.5"
>>   OR:
>>     fire_hydrant:couplings=2.5;2.5;4.5
>>     fire_hydrant:couplings_unit=inch
> the norm in OSM usually looks like
> fire_hydrant:couplings=2.5in;2.5in;4.5in
> but maybe spelled out (inch vs in), i'd have to check.
>>> 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.
>> There is not yet a tag for this. In Austria a typical wrench looks like
>> this: http://i.ebayimg.com/images/i/251745653405-0-1/s-l1000.jpg
>> The left side is used to open the bolt at the top, while the right side
>> can be used to open the cap of the hose couplings.
> i'd need to do some research. there are a variety of wrench types available,
> you can get an idea from the grainger website:
> https://www.grainger.com/category/spanner-and-hydrant-wrenches/fire-protection/safety/ecatalog/N-kyk?okey=hydrant+wrenches&mkey=hydrant+wrenches&refineSearchString=hydrant+wrenches&NLSCM=14&EndecaKeyword=hydrant+wrenches&searchBar=true&searchRedirect=hydrant+wrenches
> richard

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