scope:

This European Standard provides classification, general requirements and test methods for flexible, pre-insulated, direct buried district heating pipe network systems.
It may only be used in conjunction with either part 2, 3, 4, and 5.
Depending on the pipe assembly (see table 4), the standard is valid for maximum operating temperatures of 95 °C to 140 °C and operating pressures of 6 bar to 25 bar.
The pipe systems are designed for a life time of 30 years. For pipe systems with plastic service pipes, the respective temperature profiles are defined in parts 2 and 3.
NOTE: For the transport of other liquids, for example potable water, additional requirements may be applicable.