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