Piping structure of heating/heat-retaining tube

Abstract

A piping structure of a tube for heating or heat-retaining of fluid such as gas and liquid includes a conduit through which fluid is transported and a plurality of heater lines inserted into the conduit, in which the heater lines are connected in parallel. The piping structure is capable of transporting fluid over a long distance while heating the fluid or keeping the temperature of the heated fluid constant even when the total piping length is long.

1 . A piping structure of a tube for heating or heat retaining of fluid comprising:
 a conduit through which fluid is transported; and   a plurality of heater lines inserted into the conduit;   wherein the heater lines are connected in parallel.   
   
   
       2 . The piping structure according to  claim 1  further comprising at least one tube joint;
 wherein a plurality of conduits are connected with each other by the tube joint; and   wherein lead wires for transmitting power to the heater lines are connected to the heater lines through the tube joint.   
   
   
       3 . The piping structure according to  claim 2 , wherein the heater line inserted into the conduit from one side are extended to the tube joint connected to the conduit at the other side or extended to the following conduit through the tube joint. 
   
   
       4 . The piping structure according to  claim 1 , further comprising at least one heater line having a different heat value. 
   
   
       5 . The piping structure according to  claim 2 , further comprising at least one heater line having a different heat value. 
   
   
       6 . The piping structure according to  claim 3 , further comprising at least one heater line having a different heat value.