reducing the amount of oxidant supplied via the oxidant conduit when {HEAD ~ a temperature} in the fuel conduit reaches {TAIL ~ a specified temperature} 
reaches
reducing the amount of oxidant supplied via the oxidant conduit when { HEAD ~ a temperature } in the fuel conduit reaches { TAIL ~ a specified temperature }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL