The pipes 19 contain pressurized water, e.g. at 2 4 bar, and the sprayers 21 have respective nozzles 21A directed {HEAD ~ downwards}, i.e. in {TAIL ~ the opposite direction} to the flow F1 
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The pipes 19 contain pressurized water , e.g. at 2 4 bar , and the sprayers 21 have respective nozzles 21A directed { HEAD ~ downwards } , i.e. in { TAIL ~ the opposite direction } to the flow F1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH