Method and device for rapidly replacing valve in continuous pipeline transmission

Abstract

The invention provides a method for rapidly replacing a valve in continuous pipeline transmission. A pipeline is a valve pipeline. The method sequentially comprises the following steps: 1) connecting pipes: connecting a transceiving pipe with a valve to be replaced in a condition that the valve to be replaced is switched off, wherein a sealed channel is formed by the transceiving pipe and a valve pipeline; 2) plugging the valve pipeline: positioning a driving part in the transceiving pipe, enabling the driving part to perform axial reciprocating motions along the transceiving pipe to open the valve, conveying a plugging device into the valve pipeline by the driving part, pressurizing the inner cavity of the plugging device and fixing the inner cavity in the valve pipeline; 3) removing the driving part: taking out the driving part from the valve pipeline; 4) dismounting the pipe: performing pressure release and dismounting on the transceiving pipe; 5) performing valve replacement: dismounting the valve and mounting a new valve; 6) taking out a plugging machine: connecting the transceiving pipe with the new valve, performing pressure release on the plugging device, taking the plugging device back into the transceiving pipe by virtue of the driving part in a condition that the new valve is opened, and closing the novel valve; and 7) dismounting the transceiving pipe after pressure release is performed. The method provided by the invention has the advantages of simple process, short valve replacement time, high security and reliability, and low cost. The invention further discloses a device for realizing the method.

Description

technical field [0001] The invention relates to a maintenance technology for pipelines under pressure, in particular to a method and device for quickly changing valves in pipelines without needing to drill holes in valve pipelines and to seal the holes after valve replacement. Background technique [0002] At present, the pressure-changing valve of the pipeline adopts the method of stopping the transmission or opening and blocking the non-stop transmission and replacement valve. [0003] The advantage of stop loss is that it is the safest, but the cost is very high. [0004] like figure 1 and figure 2 As shown, they are respectively the schematic diagram and the completion drawing of the occluder under the method of opening the hole and changing the valve. The pipeline 11 is connected to the main gathering and transportation pipeline 10. Machine 13 hole opening-bottom occluder 14 card sealing-cut old ball valve 15-weld new ball valve 15-take out occluder 14-lower plug ca...

AI Technical Summary

Problems solved by technology

This method of opening, plugging and changing valves needs to open holes under pressure on the pipeline 11 when sending the occluder 14 into the pipeline 11. After the valve is replaced, the hole needs to be sealed. The process is complicated and takes a long time.

On the other hand, opening or sealing holes under pressure on the pipeline may cause gas or liquid leakage in the pipeline. After the valve is replaced, the hole needs to be sealed with plug cake and flange cover. , the pipeline is also under pressure, which may also cause gas or liquid leakage, which will bring danger to the construction personnel, and after the hole is blocked, due to the long-term impact of the internal gas or liquid pressure in the pipeline, it is likely to Leakage of gas or liquid is a potential safety hazard. For safety reasons, it may be necessary to increase detection equipment. When it is detected that the gas outside the pipeline exceeds the standard or the liquid leaks, it will be repaired and replaced.

[0005] Based on the above, this method of opening a hole under pressure to replace a valve is not only complicated in process and takes a long time; it is also poor in safety and will bring follow-up troubles and increase the cost of manpower, material resources and financial resources

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