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5.2 Outdoor Thermal System

5.2.1 The seismic design calculation of outdoor thermal pipelines shall be carried out in accordance with the relevant provisions of the current national standard "Code for Seismic Design of Outdoor Water Supply and Drainage and Gas Thermal Engineering" GB 50032.

5.2.2 The selection of pipes for outdoor thermal pipelines shall meet the following requirements:
1 Pipes should be made of steel pipes and flanged or welded;
2 At 7 degrees, 8 degrees, and the foundation soil is a liquefiable land section or an area of 9 degrees, the accessories of the main pipeline of the thermal pipeline shall be ductile iron, cast steel or non-ferrous metal materials
In areas of 8 degrees and below, the thermal insulation material of the underground thermal pipelines should have good flexibility.

5.2.3 The arrangement and laying of outdoor heat pipes shall meet the following requirements:
1 The pipelines should be avoided in high-kill, deep pit, collapse and landslide areas;
2 The main pipe should be arranged in a ring, and the segmented valve should be reasonably set. When a branch arrangement is adopted, branch valves and bypass pipes should be reasonably set;
3 Pipes should be laid directly underground or in trenches, not overhead. When it is 9 degrees, pipe trench laying should be adopted;
4 The thermal inlet shut-off valve should be set outside the building, and a flexible connection should be set behind the valve;
5 Anti-seismic and anti-deformation measures shall be taken in combination with preventing the expansion and contraction of thermal pipelines;
67 degrees and the foundation soil is a liquefiable area or an area of 8 degrees or 9 degrees, flexible connections should be provided on the inlet and outlet pipes of the pump;
7 When the pipeline passes through the wall or foundation of the building (structure), it shall meet the following requirements:
1) A sleeve shall be provided on the wall or foundation that passes through the pipeline, and the gap between the pipeline and the casing shall be filled with flexible materials;
2) When the crossing pipeline and the wall or foundation are embedded, a flexible connector should be provided near the crossing pipeline.
8 When thermal pipelines are laid directly underground and cannot avoid active fault zones, the following measures shall be taken:
1) The pipeline should be orthogonal to the fault zone;
2) The pipeline should be laid in the sleeve, and the surrounding should be filled with fine sand;
3) Pipes and sleeves should be made of steel pipes;
4) Emergency shut-off valves should be provided on the pipelines on both sides of the fracture zone.

5.2.4 Valve wells and thermal chambers on outdoor thermal pipelines shall meet the following requirements:
1 Valve wells and thermal chambers on pipelines may not be subjected to seismic check calculations;
2 Valves on pipelines should be equipped with valve wells;
37 °, 8 ° and the foundation soil is a liquefiable land section or an area of 9 °. The auxiliary structures such as valve wells and thermal chambers of pipelines should not adopt masonry structures.