I had added the odd sewer pipe using man_made=sewage_vent, because I had spotted some and was curious what they were. But someone in the Irish community had pointed out the under-documentation of man_made tags, so I did a bit of work, looked it up on wikidata and decided to go for man_made=sewer_vent instead. (I thought that man_made=sewer_ventilation_pipe was a bit long.) I retagged the existing ones which weren’t many anyway and added a few more from Wikimedia, especially in England, where many were covered by geograph.co.uk and one particular user (Rodhullandemu) especially.
By Phil Nash from Wikimedia Commons CC BY-SA 4.0, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Some in Ireland and in England are listed monuments, believe it or not.
Because I had noted the manufacturer for the three in Freshford, Co. Kilkenny, Ireland, two of which are listed, I started looking into documenting the manufacturer, and the same ones seemed to pop up on Wikimedia, at least where they were recorded.
So, I think it would be really cool to map the manufacturer and create wikidata entries (I’ve done so for some), because then we can have a colour-coded map of the sewer ventilation pipes highlighting the manufacturer. I think it would be interesting to see the distribution.
I’ve made an overpass query with colour codes for the manufacturers I’ve found so far.
If anyone has the ability to make a more user friendly map as an exercise, please do and let me know.
Sewer gas vent by Chris Marsh, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons
If anyone lives near one of these with the weather vane and crown, for example, I’d love to find out who made them. There are quite a few of them documented on WikiMedia, but nobody has taken the time to note the manufacturer.
I think it’s interesting to see the industrial history of Ireland and Britain represented in that way. Of course, manhole covers and post boxes could be included as well, since they were often made in the same foundries.
Edit 2023-07-20: I’ve added some “mad” nano tagging to the wikipage, just because we have the potential, and the Building of Ireland (misleading title) website describes the shape of the base (and top, but I haven’t gotten around to that) and sometimes give manufacturer, but you cannot filter by the terms. We now can.