The heater comprises at least one heater section intended for heating the shell surface , and is supported via {HEAD ~ a suspension attachment} by {TAIL ~ means} of a supporting means on a variable, second distance from the shell axis  
by
The heater comprises at least one heater section intended for heating the shell surface , and is supported via { HEAD ~ a suspension attachment } by { TAIL ~ means } of a supporting means on a variable , second distance from the shell axis
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 REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH