Application of Discharge Orifice for Pipeline Magnetic Flux Leakage Inspection Gauge
In order to adapt to the fast flow rate of medium in large-diameter natural gas pipeline,the speed control system installed on the pipeline magnetic flux leakage inspection gauge to realize the active regulation of the running speed of the MFL pig is necessary,however,there is not enough installing space for the speed control system on the conventional MFL pig.For the natural gas with a certain flow rate,the method of discharge orifice was used on the MFL pig to adjust the running speed of the MFL pig.Since discharge hole with a fixed area was opened on the discharge orifice,the starting pressure difference was very important in the sending process of the MFL pig.The starting pressure difference of the MFL pig was obtained by pull test,whether the MFL pig starting normally or not could be verified by the starting pressure difference equation of the MFL pig with fixed discharge hole,and the running speed of the MFL pig was obtained by the established local resistance coefficient equation with fixed discharge hole.The reliability of the above equation and calculation process was verified by 4 industrial applications.
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NSTL
万方数据
维普
