Hi all. @Marc
> and is this tag well used? I am not able to judge whether values are realistic Well, as in every tag, there are wrong values. But now, with a more clear description on the wiki, there will be less errors and future corrections will be possible. Anyway all values of fire_hydrant:diameter=# should go in the new tag diameter=#, or whatever else we choose. > what do others think? if somebody find it is not appropriate, I think that it > would be desirable to split out the "meaning change" > to validate the rest of the proposal. At this point, after the discussion of pros and cons, I think that the "meaning change" has no more sense. @Francois: fire_hydrant:count=# --> devices=# +1 I'm against grouping more than one hydrant one a node, but if we want to keep this possibility, devices=# for me is better. > A pressurized hydrant : emergency=fire_hydrant + optional > water_source=network + even more optional pressure=* > A pillar connected to a water tank where water can be pumped from : > emergency=fire_hydrant + water_source=water_tank + pressure=0 > A pipe going permanently in a river or a pond where water can be pumped from : > emergency=fire_hydrant + water_source=pond + pressure=0 +1 @Martin: > unfortunately this is not yet defined unambiguously In hydraulics in general, the diameter is the nominal one [0] that is related but not equal to the inner diameter. On hydrants in particular, the number that is die-casted on them, is the nominal diameter of the undergound junction towards the water network. Also couplings diameters are always nominal diameters of the threads [1]. Maybe it is enough to document on the wiki that when diameter=* is used for hydrants, it is referred to nominal diameter? > Not sure about pressure=0 though, shouldn't that be 1? The wiki mentions also > "suction" for dry hydrants In hydraulics, pressure normally is measured relatively to atmospheric pressure. So 0 is correct. However, to avoid misunderstandings, we can keep pressure=suction for these cases. Best regards, Alberto [0] https://en.wikipedia.org/wiki/Nominal_Pipe_Size [1] https://en.wikipedia.org/wiki/ISO_metric_screw_thread --- Questa e-mail è stata controllata per individuare virus con Avast antivirus. https://www.avast.com/antivirus _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
