· High temperature and high pressure steam pipeline engineering design technology

　　As the main power source for electric power, petroleum, and chemical enterprises, high temperature and high pressure steam pipes are under very high operation pressure and temperatures.

　　Currently on the main steam pipes at 9.81MPa, and 550 ℃ or above, the "丌" shape compensator method is widely used. But, it takes up much space and is very difficult for large diameter pipe layouts. If installed vertically with high support and spring hangers, it leads to compensation with smaller capability and shorter distance, more elbow and material consumption, large temperature drop, pressure loss, fluid resistance, as well as small heating radius, high construction and operation costs. In addition, there is secondary stress, which requires more allowable stress on the piping material. Pipeline expansion caused by temperature change puts great thermal stress on tube walls. In order to solve this problem, most use imported P91material at present.

　　With the rotary compensation method, the stress on pipes is fully released, which greatly reduces the requirements for pipeline body material. Then, imported P91materials can be replaced by homemade 12CrlMoVG. At the same time, the relatively small constant thrust and reduced pipe extension saves a lot of elbows and reduces pressure and heat loss. This can not only improve pipeline safety and reliability, but also greatly reduces thermal network construction investment costs and energy consumption losses. It solves a global problem in low-power compensation techniques in high temperature and high pressure long-distance transmission pipes, and also has great significance for energy savings and emission reductions.

　　Cases: Main steam pipeline projects for Jiangsu Linggu Chemical Co., Ltd., Guizhou Kaiyang Chemical Co. , Ltd. and Shanxi Xiangyuan Cheng Feng Thermoelectricity Co. Ltd.