Design Temperature Tests - Heat networks with d ≥100mm are tested. In this case, the design temperature in the supply pipeline and in the return pipe should not exceed 100 0 C. The design temperature is maintained for 30 minutes, while the increase and decrease in temperature should not be more than 30 0 C / hour. This type of test is carried out after the networks have been pressure tested and breaks have been eliminated.
Tests to determine thermal and hydraulic losses - This test is carried out on a circulation circuit consisting of supply and return lines and a jumper between them, all branches of the branch are disconnected. In this case, the decrease in temperature along the ring is caused only by heat losses of the pipelines. The test time is 2t to + (10-12 hours), t to is the travel time of the temperature wave along the ring. Temperature wave - an increase in temperature by 10-20 0 C above the test along the entire length of the temperature ring, is established by observers and the temperature change is recorded.
- The test for hydraulic losses is carried out in two modes: at maximum flow and 80% of the maximum. For each mode, at least 15 readings must be taken with an interval of 5 minutes .
During preliminary crimping, the strength and density of not only the welds, but also the walls of the pipeline are checked, since manufacturing defects are possible in the pipes. The pipeline is tested in sections (sections), without fittings, equipment and insulation. If pre-insulated pipes are used, only welded joints are tested. - During preliminary crimping, the strength and density of not only the welds, but also the walls of the pipeline are checked, since manufacturing defects are possible in the pipes. The pipeline is tested in sections (sections), without fittings, equipment and insulation. If pre-insulated pipes are used, only welded joints are tested.
- The final pressure testing is carried out after the installation of the heating network is completed, with the trench filled in, except for the joints between sections.
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