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