According to this wiki entry: http://wiki.openstreetmap.org/wiki/Map_Features/Units
it would be: fire_hydrant:couplings=2.5";2.5";4.5" 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 > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
