关键词: 石油, 天然气, 管道, 电磁感应加热

Abstract: The traditional liquefied gas flame heating method has been long used for pipe-end preheating before welding in construction of a pipeline. This method cannot match with modern large-scale industrialized construction of pipelines owing to its low heating efficiency, heterogeneous heating temperature and inclination to influence of climatic conditions. China Petroleum Pipelines Bureau No.3 Branch Company has developed the GDJR series of pipe electromagnetic induction heating equipment to meet China’s need for high-quality and high-efficiency construction of pipelines. This equipment adopts electromagnetic induction eddy current heating principle to preheat pipe end. Composed of intermediate frequency heating power supply and electromagnetic induction heater, this equipment can be used to preheat oil and gas steel pipe before welding, keep temperature after welding, and preheat for anti-corrosion and joint wrapping. The rated work of the equipment is 50kW while the rated work frequency is 15 to 20kHz. The temperature rising speed is 35 to 50°C/min. It has a number of advantages, such as small in volume, light in weight, quick in temperature-rising speed, convenient in operation and reliable in safety. Localized and put into wide application in construction of a number of domestic oil and gas pipelines at the present time, this equipment significantly improves preheating efficiency for pipeline construction and technically reduces the cost of engineering construction

Key words: petroleum, natural gas, pipeline, electromagnetic induction heating