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<p><font face="Verdana">(as follow up on my previous reply)<br>
What could also work is in_outlet if you wish or pipe_in_outlet.<br>
You might consider to use it also on ways and areas as some are
very long and substantial. Like drain gullies, subway vents.<br>
<br>
Please refer also to man_made=chimney as a possible top-level
tag for "vents".<br>
</font></p>
<p><font face="Verdana">You asked for examples, from wikimedia
commons what could fit here:</font></p>
<p><font face="Verdana"><a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/wiki/File:Pipeline_vent_-_panoramio.jpg">https://commons.wikimedia.org/wiki/File:Pipeline_vent_-_panoramio.jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/wiki/File:Pipe_%26_Vent_(Washington,_DC)_(5640333178).jpg">https://commons.wikimedia.org/wiki/File:Pipe_%26_Vent_(Washington,_DC)_(5640333178).jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/wiki/File:Unusual_pipe-vent_atop_Portsdown_Hill._-_geograph.org.uk_-_113845.jpg">https://commons.wikimedia.org/wiki/File:Unusual_pipe-vent_atop_Portsdown_Hill._-_geograph.org.uk_-_113845.jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/w/index.php?title=Special:Search&limit=20&offset=80&profile=default&search=pipe+vent&advancedSearch-current=">https://commons.wikimedia.org/w/index.php?title=Special:Search&limit=20&offset=80&profile=default&search=pipe+vent&advancedSearch-current=</a>{}&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1#/media/<a class="moz-txt-link-freetext" href="File:Vent_pipe_(28286139058).jpg">File:Vent_pipe_(28286139058).jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/w/index.php?search=subway+ventilation&title=Special%3ASearch&profile=advanced&fulltext=1&advancedSearch-current=%7B%7D&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1#/media/File:Little_Red_Square_td_(2018-10-22)_08_-_IND_Vent_Grates.jpg">https://commons.wikimedia.org/w/index.php?search=subway+ventilation&title=Special%3ASearch&profile=advanced&fulltext=1&advancedSearch-current=%7B%7D&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1#/media/File:Little_Red_Square_td_(2018-10-22)_08_-_IND_Vent_Grates.jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/w/index.php?search=subway+ventilation&title=Special%3ASearch&profile=advanced&fulltext=1&advancedSearch-current=%7B%7D&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1#/media/File:Ventilacni_komin_metra_A_v_Sadech_Svatopluka_Cecha-1-2020-praha.jpg">https://commons.wikimedia.org/w/index.php?search=subway+ventilation&title=Special%3ASearch&profile=advanced&fulltext=1&advancedSearch-current=%7B%7D&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1#/media/File:Ventilacni_komin_metra_A_v_Sadech_Svatopluka_Cecha-1-2020-praha.jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/w/index.php?search=subway+ventilation&title=Special%3ASearch&profile=advanced&fulltext=1&advancedSearch-current=%7B%7D&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1#/media/File:Moscow,_Korovy_Val_street,_subway_ventilation_shafts_(31119247116).jpg">https://commons.wikimedia.org/w/index.php?search=subway+ventilation&title=Special%3ASearch&profile=advanced&fulltext=1&advancedSearch-current=%7B%7D&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1#/media/File:Moscow,_Korovy_Val_street,_subway_ventilation_shafts_(31119247116).jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/w/index.php?title=Special:Search&limit=20&offset=20&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1&search=drain&advancedSearch-current=">https://commons.wikimedia.org/w/index.php?title=Special:Search&limit=20&offset=20&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1&search=drain&advancedSearch-current=</a>{}#/media/<a class="moz-txt-link-freetext" href="File:Tromplaan_V_Drain_streethole,_Winschoten_(2020)_01.jpg">File:Tromplaan_V_Drain_streethole,_Winschoten_(2020)_01.jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/wiki/File:Drain_to_the_Afon_Llwyd.jpg">https://commons.wikimedia.org/wiki/File:Drain_to_the_Afon_Llwyd.jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/wiki/File:Ullrich_Water_Treatment_Plant_Intake_Lake_Austin_2020.jpg">https://commons.wikimedia.org/wiki/File:Ullrich_Water_Treatment_Plant_Intake_Lake_Austin_2020.jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/wiki/File:Water_intake_on_Faw_Mount_-_geograph.org.uk_-_1809292.jpg">https://commons.wikimedia.org/wiki/File:Water_intake_on_Faw_Mount_-_geograph.org.uk_-_1809292.jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/wiki/File:Kaitoke_weir_and_water_supply_intake.jpg">https://commons.wikimedia.org/wiki/File:Kaitoke_weir_and_water_supply_intake.jpg</a><br>
<a class="moz-txt-link-freetext" href="https://commons.wikimedia.org/wiki/File:Water_Intake_CoRB.JPG">https://commons.wikimedia.org/wiki/File:Water_Intake_CoRB.JPG</a><br>
<br>
</font></p>
<div class="moz-cite-prefix">On 20/03/2021 13:40, Bert -Araali- Van
Opstal wrote:<br>
</div>
<blockquote type="cite"
cite="mid:6fd4349c-1699-d555-88cd-fcefc5483e72@gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p><font face="Verdana">Interesting conversation and again we
divert to scientific explanations and semantics, which in my
opinion doesn't make our wiki usable and understandable for
the common mapper.</font></p>
<p><font face="Verdana">I worked for many years in engineering and
construction, also pipelines, both for liquids and gasses as
you might call them.<br>
In nearly all of the cases however we never used the term
liquid, gas, plasma or fluid. As in most of the cases that's
not what is flowing there. Air is a mixture of vapour, gas and
solids (dust particles). The liquids, especially waste water
as mentioned here in the example is a mixture of liquids and
solids, which when they exit a pipe creates vapour and gasses,
when it is in the pipe has a layer of vapour and gas on top.
That's why you can smell them.<br>
Some pipes are used to dump pure solids, like sand, rocks
etc... or slurries, a mixture which contains mostly solids.<br>
I would prefer a general understandable description:" a
substance or a mixture of substances that flow."</font></p>
<p><font face="Verdana">I even doubt if we need to describe the
substance, if we look at what is initially intended to be
tagged here.<br>
I believe the question was made if we could use this also for
air. Well, drain_socks used for air are not drain_socks, they
are vents.<br>
A drain sock is to dump any substance that falls down, does
not dissolve into the air. A vent is the opposite, it is to
dump or dissolve a substance into the air. But again, in most
practical applications, you can't differentiate them if you
are not an engineer. Vents might contain drains to drain
condensate, drains or drain socks contain vents. Those who are
not mixed function as both, nearly always as drain or vent.<br>
So in the engineering and construction world we just call them
"outlet" or "end". To avoid confusion add pipe or duct to it,
because an outlt is also used in conjunction with some shops.
I would suggest pipe, since many non technical people don't
know the difference between pipe and duct.<br>
You also want a tag for inlets, use "end", the end of the pipe
or duct can be an inlet. A sock in engineering refers to a
very specific type, you can refer to that with and attribution
key.<br>
Culverts are tunnels or pipes. Same here as with pipes and
ducts, the common technical term is pipe.<br>
</font></p>
<p><font face="Verdana">So as main tag I would prefer pipe_end=*.
To be used on pipelines, culverts and vents.<br>
<br>
They are very important features as we use them in
environmental and engineering studies to model and map
hazardous zones, which we can perfectly map in OSM and in some
cases even marked.</font></p>
<p><font face="Verdana">Greetings,</font></p>
<p><font face="Verdana">Bert Araali<br>
</font></p>
<blockquote type="cite"
cite="mid:2b620d6a-c18d-5920-e368-5dd5f563e72f@gmail.com"> </blockquote>
</blockquote>
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