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