METHOD OF EMPTYING PIPELINE SECTIONS FROM GAS IN MULTIPLE GAS PIPELINE SYSTEMS Russian patent published in 2018 - IPC F17D1/02 

FIELD: gas industry.

SUBSTANCE: essence of the invention lies in the fact that in the method of emptying pipeline sections from gas in multiline gas pipeline systems, gas from the empty section is fed to an integrated gas treatment unit, the utilization gas pressure is reduced to the gas pressure value of the integrated gas treatment unit after the primary compression and cooling the utilization gas is injected to the gas of the integrated gas treatment unit, after its primary compression and cooling, the absorbent is first injected into the mixed gas, the absorbent is first removed from the mixed gas, the mixed gas is compressed and cooled for the second time, absorbent is injected for the second time into the mixed gas, absorbent is removed for the second time from the mixed gas, the mixed gas is removed from the complex gas treatment unit and transported to a parallel pipeline. By reducing the gas pressure of the utilization in the emptied area up to the pressure of the gas of the integrated gas treatment unit after the primary compression and cooling, the pressure of the recycling gas decreases to the value of the input pressure of the gas of the integrated gas treatment plant, disposal gas is fed to purification from mechanical impurities and moisture when it is present; gas is additionally purified from mechanical impurities and moisture when it is present; disposal gas is injected into gas of integrated gas treatment unit, after its additional purification from moisture and mechanical impurities, it is first compressed and cooled by the mixed gas, the absorbent is first introduced into the mixed gas, the absorbent is first removed from the mixed gas, the secondary gas is compressed and cooled again, the second time the absorbent is introduced into the mixed gas, the second time the absorbent is removed from the mixed gas, the mixed gas is removed from the complex gas treatment unit and transported to a parallel pipeline.

EFFECT: method is proposed for emptying gas pipeline sections from gas contained in them when carrying out repair work in main gas pipeline systems.

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