[Tagging] Fire hydrants vs suction_point

François Lacombe fl.infosreseaux at gmail.com
Mon Aug 28 06:34:29 UTC 2017

Hi Viking,

If you mind about capacity unit, you may be interested in rating=*
It's for now used in power knowledge, to give the nominal amount of power a
power transformer or converter can transmit.

A proposal is currently under writing for transformers, and I can refine
this key like rating:intensity and then rating:water can be introduced for
fire_hydrants or whatever water feature.

I definetly think a universal tag is the best solution, whatever flow_rate
or rating:water.

All the best


*François Lacombe*

fl dot infosreseaux At gmail dot com
@InfosReseaux <http://www.twitter.com/InfosReseaux>

2017-08-28 0:18 GMT+02:00 Viking <viking81 at tin.it>:

> Hi, I've been away for a week. I'll try to read all your comments.
> First of all: Dry riser is a device. Suction point another one. Hydrant
> another one. Three different things, three different tags. Ok?
> Then I agree to remove the use of : where possible.
> The word "capacity" is in most cases synonymous of "volume", not
> "volume/time". It is suitable for a park, for a tank, for a pond. Instead
> the term "Flow capacity" is sometimes used for streams or pipelines, but I
> think that the best words are "flow rate": is there a native Englishman
> that can confirm this? In any case, I would use the word "flow", because
> it's more intuitive for non British users.
> For hydrants or suction point we need to have l/min or gpm: it is
> necessary for quick calculations when we refill the water tank. So if we
> use the universal tag flow_capacity=* (or flow_rate=*) the international
> standard unit will be m3/s, that is suitable for river, streams, etc., but
> we'll need to specify each time l/min or gpm for hydrants and suction
> points.
> Do you think that it is better to use a universal tag (flow_capacity=* or
> flow_rate=*) and specify each time the unit of measure rather than have a
> hydrant specific tag (fire_hydrant:flow_capacity=* or
> fire_hydrant:flow_rate=*) with its own default unit (l/min)?
> > Currently a contributor can create a emergency=fire_hydrant.
> > It's right, it is usable if you don't care about pressure (for example
> if you have anyway a pump with you).
> > Another day, another contributor will add additional information.
> And if we divide emergency=fire_hydrant from emergency=suction_point what
> changes? Nothing.
> If a contributor (in some cases and in some countries) can't distinguish
> an hydrant from a suction point he will randomly use one tag or the other
> (more probably emergency=fire_hydrant).
> BUT, if you have anyway a pump with you, even if the tag is incorrect, you
> can take water from that point.
> And eventually another day, another contributor will fix the tag.
> The problem is not which way we choose to tag these objects, but the
> problem is in the real world where different object are not visually
> distinguishable by an inexperienced mapper.
> I will read other comments in the next days.
> Best regards,
> Alberto
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