This may be a UK/North America difference, but I would have called the thing you describe a "dry riser", and a standpipe is just a short section of rigid pipe to connect a hose to a (below ground level) fire hydrant.
Graham -- Graham Jones Hartlepool, UK.
_______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging