Ed Avis wrote: >Sent: 09 November 2009 6:08 PM >To: [email protected] >Subject: Re: [Talk-GB] Underground Pipelines > >Isn't this analogous to the flow in rivers?
No, oil and gas pipeline are driven by pressure and go up and downhill. Only a gravity sewer acts similar to a river in that it has an upstream and downstream end. The direction of flow for major transmission pipelines (all utilities) is uni-directional. Bi-directional flow would only likely occur in distribution networks, such as a local water supply system in an urban area. Cheers Andy _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-gb
