I am developing a spray hose system that has ball valves every 200 meters. These valves allow for enabling a water curtain in selected segments of a long hose lay.
Each ball valve is operated by a digital network that runs on a wire pair embedded in the hoses.
The spacing could be much more than 200 meters.
The hose with embedded wire already exists from All American Hose.
The Dir of Engineering at Hale Products has co-authored a paper with me that was presented at an Electrical Engineering Conference.
The system can be used to stop/slow wildfires or it can be use to confine Rx fires.
Video demo of system at http://www.bit.ly/14J3s2g
Full web site is www.electric-fluid-pipeline.com