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Zhao D.,China National Offshore Oil Corporation | Qian J.,Shanghai Richtech Engineering Co. | Wang D.,Shanghai Richtech Engineering Co.
Ship Building of China | Year: 2014

Upheaval buckling is a key point in buried pipeline design under high temperature and high pressure conditions. Three analysis methods are discussed in this paper, including analytical method, semi-empirical method and finite element method. The feature and applicability of these methods are summarized for the pipeline upheaval buckling. ©, 2014, The Editorial Board of Ship Building of China. All right reserved.

Gao F.,China National Offshore Oil Corporation | Gao Y.,China National Offshore Oil Corporation | Zhang X.,Shanghai Richtech Engineering Co. | Wang D.,Shanghai Richtech Engineering Co. | Li C.,Shanghai Richtech Engineering Co.
Ship Building of China | Year: 2014

Deepwater oil and gas resource is one of the future directions of the energy industry. In this essay, a marine drilling riser system in one semisubmersible platform working in the South China Sea is simulated with finite element method. Axial dynamic characteristics are analyzed and a comparison between hard and soft hang-off mode is provided. The finite element software Orcaflex is selected to perform the simulation of presented example. This example can supply useful technical reference for actual hang-off operation of marine drilling riser system, particularly for deepwater marine drilling riser system working in the South China Sea area.

Tang X.,Southwest Petroleum University | Qiao Q.,Southwest Petroleum University | Qiao Q.,Shanghai Richtech Engineering Co. | Li J.,Southwest Petroleum University | And 2 more authors.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2014

The experiments on desulfurizer screening, optimization of desulfurization conditions and the desulfurizer recovering were carried out for organic sulfur removal from refinery C5 fraction. The results indicated that the 5% serotonin solution (TSC5) was the best desulfurizer. Under the conditions of 0.1 MPa, 30℃, reaction time 20 min and desulfurizer to oil volume ratio 0.3, the sulfur mass fraction in refinery C5 fraction could be reduced from 106 to 8.7 μg/g, the desulfurization rate and yield were 91.8% and 99.4%, respectively. With the washing water to oil volume ratio of 1.5(the volume ratio of recycling water to oil 1.3 and deionized water to oil 0.2), the desulfurized C5 fraction was washed, by which serotonin mass fraction in C5 fraction could be reduced to 2 μg/g or less. Under the conditions of 80℃ and airspeed 180 h-1, the mixture of serotonin-rich liquid and washing water was treated by using N2 gas lifting for separation and recycling. The desulfurization effect of re-formulated TSC5 was quite the same as that of fresh one. At last, a process of organic sulfur removal from C5 fraction was proposed.

Tang X.,Southwest Petroleum University | Qiao Q.,Shanghai Richtech Engineering Co. | Cheng J.,Southwest Petroleum University | Xiang M.,Sichuan Hengri Natural gas Engineering Co.
Shiyou Huagong/Petrochemical Technology | Year: 2014

The extractive distillation of methyl tert-butyl ether (MTBE) was investigated to obtain low-sulfur product. Extractants and operation conditions of the extractive distillation were optimized. The results showed that, the solubility of MTBE in TMS (H2O with cosolvent ZRD) was 10.5. Under the optimized conditions of TMS as extractant, extraction temperature 15℃, volume ratio of TMS to MTBE 3.0, extraction time 15 s, phase separation time 7 min, distillation temperature 75℃ and distillation time 25 min, the sulfur content in MTBE could be reduced from 98.1 μg/g to 8.4 μg/g, and the desulfurization rate and MTBE yield were 91.44% and 99.69%, respectively. The sulfur content was still reduced to less than 10 μg/g after TMS was reused 5 times. This method can avoid the enrichment of sulfur in extractants, which leads to that it is difficult to obtain low sulfur MTBE product. ©, 2014, Beijing Research Institute of Chemical Industry. All right reserved.

Wu W.-W.,Shanghai Richtech Engineering Co. | Miao Q.-M.,Shanghai Richtech Engineering Co. | Wang Y.-X.,China Ship Scientific Research Center
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE | Year: 2014

This paper gives a review on VIV experimental research. A detailed introduction of the experimental study on the crossflow vortex-induced vibration of a towed circular cylinder in CSSRC's towing tank is presented and classical VIV phenomena are explained and analyzed in this study. However, some results which are much different from those in the classical literatures in the past few decades are observed at the same time. For example, instead of reduced velocity Ur from 5 to 8, the "lock-in" region happened in the reduced velocity ranged from 10 to 14 in our tests, where the reduced velocity is calculated by the natural frequency. The non-dimensional frequency (oscillation frequency over natural frequency) of about 1.8 in the "lock-in" region is also different from that of 1.0 in the classical literatures. Interestingly, the author found that some of the results given by Moe and Wu (1990), Sarpkaya (1995), Govardhan and Williamson (2000), Pan zhiyuan (2005) and so on, reported the similar phenomenon. Since above listed papers have the same points of view, whether can we say that the results in this paper are possible for the case of low mass ratio. To conclude that, however, many questions need to be answered. In an effort to gain a better understanding of VIV phenomenon, this paper presents results of further analysis on the test cases and parameters. Copyright © 2014 by ASME.

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