In order to reduce the flow resistance in the gas path of the lance, the through openings each have {HEAD ~ an opening width} which is larger in {TAIL ~ the circumferential direction} than in the radial direction 
In order to reduce the flow resistance in the gas path of the lance , the through openings each have { HEAD ~ an opening width } which is larger in { TAIL ~ the circumferential direction } than in the radial direction
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 HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH