[Tagging] pressurized=* on pipelines

[François Lacombe]

Hi Kyle

Le mer. 15 sept. 2021 à 01:12, Kyle Hensel <K.y.l.e at outlook.co.nz> a écrit :

> Following on from
> https://lists.openstreetmap.org/pipermail/tagging/2021-September/062422.html
> regarding pressurized waterways:
>
>
>
> There is currently no way to indicate whether a man_made=pipeline is
> pressurized
> Some wastewater pipelines use gravity to flow to the bottom of the hill
> (unpressurized), whereas some pipelines are obviously pressurised like LPG
> and geothermal steam.
>

You can use pressure=yes unless you know the actual value in bar.
https://wiki.openstreetmap.org/wiki/Key:pressure


>
>  So, if we were to introduce pressurized=yes/no for pipelines, would it
> make sense to replace waterway=pressurized with
> waterway=canal/river/stream/ditch and pressurized=yes/no? To be consistent.
>
> pressurized=yes/no would only be allowed on waterway=* if tunnel=* is also
> present.
>

As river, canal, stream or ditches are open flow waterways, it makes less
sense to combine them with pressurised.
If pressure>0, then waterway=pressurised is expected.
https://wiki.openstreetmap.org/wiki/Key:waterway#Values

Tunnels aren't the only infrastructure that can handle pressure.
Depending on the construction (tubes or not), waterway can also be combined
with man_made=pipeline (for penstocks for instance).
There are some discussions about that in
https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies

Best regards

François
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