The apparatus 1, wherein said alloy lining has a thickness of {HEAD ~ from 0.5 to 5 mm} and the double layer coating has {TAIL ~ a thickness} of from 2 to 40 μm 
The apparatus 1 , wherein said alloy lining has a thickness of { HEAD ~ from 0.5 to 5 mm } and the double layer coating has { TAIL ~ a thickness } of from 2 to 40 μm
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH