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In this study, the comprehensive properties of a P22 high-temperature steam pipeline with moderate spheroidization were evaluated after more than 11,700 h of operation through a series of physico-chemical properties testing, especially for a creep test. The remaining life of the P22 high-temperature steam pipeline was analyzed and predicted by the θ parameter method, to guide the normal operation of the P22 high-temperature steam pipeline.

Abstract-This paper uses discrete events modeling to apron surface activity control problem. Through dispersing runway taxiway and apron, discrete element map to Petri net basic element, build surface activity model based on Petri net. The paper build model of apron activity by Petri net theory, use Cpntools simulate real apron activity, analysis and assess real activity efficiency of aircraft, prove validity of model and improve apron efficiency.

The aircraft's engine isn't designed for taxiing on the ground. This article describes the green taxiing systems and compares their advantages and disadvantages. Setting the Beijing Capital International Airport as an example, the taxiing fuel consumption and pollutant emissions calculation model were established. This paper calculates the total fuel consumption and pollutant emissions of the different modes in one year. The results show that the green taxiing systems can significantly reduce fuel consumption and HC, CO, CO 2 , NOx emissions. TaxiBot is better for reducing fuel consumption and NOx emissions.