For heating insulated pipes, what is the general temperature drop per kilometer? Is there any difference between overhead and underground pipes?

The temperature drop of insulated pipes for heating is generally around 4-6 degrees, which is relatively common. At the same time, depending on the diameter of the insulation pipe and the distance of the transportation distance, the temperature drop per kilometer of the insulation pipe will also be affected. The larger the pipe diameter, the higher the temperature drop, and the longer the transportation distance, the higher the temperature drop.

There is no big difference in the insulation effect between overhead and buried insulation pipes. The choice of insulation materials will affect the temperature drop