Due to manual installation of joints, the connection of the single pipe segments is one major influence for the performance of the whole network system. For granting joint quality, minimum requirements have to be proven in a standardized European test. Recommendations for the improvement of the test procedure are given. Furthermore expected operational loads in modern district heating networks are discussed. Since flexible operation of combined heat and power plants is necessary due to peak loads from feeding in of renewable energy sources, a different load spectrum is expected for the district heating network in the future. Possible amendments for the testing may be derived and a first step for understanding the load spectrum of joints in modern district heating networks is discussed.