The Corrosion Monitoring And Protection Technology In Zizhou-Mizhi Gas Field

With developing towards high pressure、high velocity and large horsepower of hydraulic system, the pressure fluctuation and noise of hydraulic system have become major problems which encumber the development and need to be solved urgently。Using low fluctuation pump with hydraulic filter is one lf the most effective approaches to absorb pressure fluctuation as well as lessen vibration and noise of hydraulic system. H type filter and K type filter are widely used for their simple structure、light pressure loss and excellent and filtering effectIn this paper, with the method of system impedance analysis and a lot of experiments, H type filter is studied carefully. It shows that, the filtering characters of a H type filter can not be depicted completely by traditional theory. First, there should be some restraint conditions for the traditional formula; second, H type filter can not only appear better filtering performance at its resonancing frequency, but also reduce fluctuation significantly in low impedance area, which is produced by installing the hydraulic system with a H type filter; last, the relationships between the effects of H type filter and its volume are nonlinear, on the condition of a small volume, if the other parameters match well,the fluctuation of pump, supply will also be reduced notably due to the emergence of low impedance area.This paper also carries out theoretical analysis and experimental research on H-K compound type filter. It shows that, H type filter is more effective for middle and low frequency fluctuation (pumping frequency), and K type filter reduces high frequency fluctuation well, a more satisfying filtering result can be obtained in wide frequency area when H-K compound filter is used.Moreover, on the basis of above theoretical analysis and experimental investigation, the designing criterions pump with H type filter and H-K compound type filter is put forward in this paper.