Search

In order to reduce the accidents caused by static electricity, simulative experiments were carried out to obtain the relationship between electrostatic and six factors in petroleum pipeline transportation. The electrostatic current generated in simulative petroleum pipeline was measured. After several groups of experiments, six factors were determined to be of great influence on the electrostatic generation, namely the length of petroleum pipeline, the diameter of pipeline, the roughness of pipeline, the velocity of oil flow, the electrical resistivity and the kinematic viscosity of oil material in the pipeline. The experimental data are analyzed based on the Generalized Gray Incidence Model, and then from its ranking results, the most critical factor and lesser important ones can be distinguished. The experimental data and analysis results show that the velocity of fluid is the most critical factor leading to the generation of static electricity.

The corrosion protection of petroleum storage tank is important for safety work in petroleum depot. Precise prediction of soleplate corrosion may reflect the security state of a storage tank, and it can provide scientific references to the anti-corrosion and maintenance in safety management. Grey Model GM (1,1) in the Grey Theory is a good prediction method based on small volume of original data, and it is introduced and applied to predict the soleplate corrosion of No.G-2 petroleum storage tank in Luquan oil depot. In order to improving the calculation speed, the GM (1,1) model is programmed by MATLAB and is further utilized in data processing. Compared with the measurements, the prediction results meet them very well, which shows that this model is practical. Meanwhile, the prediction results also reflect the status and the corrosion rate of a petroleum tank which is of great importance for the future safety management and maintenance works. Meanwhile, the GM (1,1) is suitable for wide applications in other relative fields in oil depots.

Fire and explosion accidents occurred frequently in oil depots in China which lead to great casualties, severe environmental pollution and large economic losses. Case studies of 435 fire and explosion accidents of oil depots in China from 1951 to 2013 are reviewed in this paper. From the analysis of time scale, area, facilities& equipment, ignition sources, types of accident substances, and responsibility, the statistic results show that the most dangerous area is the loading and unloading operation area, and the most vulnerable facilities & equipment are the storage tanks. Meanwhile, the proportions of ignition sources are so evenly distributed that the prevention of fire and explosion should be equally concentrated to several impact factors. The vapor cloud explosion could be the most common accident type in oil depots, and the management responsibility dominates in all of the accident causes. According to data analysis, special lessons learned from these accidents are proposed, and the majority of fire and explosion accidents in oil depots would have been prevented or avoided if security management had been improved.

This study aimed to analyze the winter indoor thermal environment of herdsman settlement residential building in China's western mountain grassland area. The method of analysis is field testing, include indoor air temperature and humidity, outdoor air temperature and humidity .The result shows the relationship betweenindoor thermal environment and envelope materials, heating methods, location of rooms. In addition, the influence was quantified in 0~15°C in winter. Finally, advice put forward to promote the indoor thermalenvironment.

This paper introduces a quantitative detection technology of hydrogen concentration in transformer oil, which is based on ultrasonic velocity measurements. This detection technique can effectively overcome the influences on final velocity measurement result produced by temperature T, gas adiabatic index ?, number of gas molecules M , and is more suitable for industrial field on-line inspection applications.