9.1 Additional possibilities

Bound System

The necessity of heating the pipeline

During the use of the ISOLAR system in several cases there is a need for manufacturing the ISOLAR pipes with a heating wire. If specially requested, it is possible to manufacture components and pipe sections with a built-in heating wire. The ISOLAR system provides excellent insulation, but in some cases even the slight­est loss of heat is impossible, or the perfect preserva­tion of beat is necessary. i n these cases the lost beat is provided by a built-in electronic heating wire. In special cases, for example in case of oil and chemical technology, the temperature of the transported materials should be kept within narrow boundaries, eves on long distances, independent of the temperature in the surrounding. The transport of viscous, easily hardening materials is such. In other cases the loss of beat should be prevented because the purpose of use makes it necessary, or it serves an easier way of solv­ing a problem. Pipelines providing hot water for domestic use serve as an example, where the circulating pipeline system can be omitted if the hot water arrives at the user without a loss of temperature.

The Heating System

Heated ISOLAR pipelines are manufactured with an electronic heating wire, which can provide the neces­sary amount of heat. Due to the thermal! energy pro­duced by the electric current the beating wire produces exactly the amount of beat that is lost by the insulated pipe in an equilibrium.

The heated ISOLAR components are manufactured with a foamy inner structure. The different sections of the heating wire should be connected with connectors when the pipes are joined.

It is possible to use a normal, electronic heating wire and a simple limit switch to control the temperature where there is no need to keep the temperature within narrow boundaries. In those cases when a constant temperature should be maintained, a digressive heat producing self-controlling heating wire can still provide the necessary temperature, even if the shorter sec­tions of the pipeline have different characteristics of cooling. In these cases a RAYCHEM heating wire can produce the necessary heat without a heat controlling device, not risking overheating or burning.

The heat producer by the heating wire is 10-30 W/m, depending on the circumstances and the type of wire, but a different amount of heat is also possible. The energy needed for the heating is taken from an electric power source.

Output data of heating wires

Maximum permissible heating wire length

85,00 m

Current consumption at +10ºC

0,65 A/m

during turning on after 10 sec

0,5 A/m

during operation

0,05 A/m

The heating power produced at +10ºC

 

10PTV2

33,0 W/m

pPTV2 - CT

30,0 W/m

Max. permissible environmental temperature

 

with heating wire turned off

+ 110 ºC

with heating wire turned on

+ 150 ºC

Radial stability

10 rad

Maximum permissible heating wire length

100, 00 m

Current consumption at +10 °C

0, 8 A/m

during turning on after 10 sec

0, 35 A/m

during operation

0, 2 A/m

The heating power produced at +10ºC

 

8TV2

26,0 W/m

6TV2 - CT

20, 0 W/m

Max. permissible environmental temperature

w ith heating wire turned off

+ 65 ºC

with heating wire turned on

+ 85 ºC

Radial stability

2 x 10 rad