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