Low-temperature pipeline flange cladding device and method

Abstract

The invention discloses a low-temperature pipeline flange cladding device and method. The low-temperature pipeline flange cladding method comprises the steps that insulating layers of an upstream pipeline and a downstream pipeline of a leakage flange are dismantled, deicing treatment is achieved through high-temperature high-pressure steam, two cladding covers are hung on the leakage flange, containing grooves formed in the inner circumferential faces of the two cladding covers cooperate with each other to form a circular-ring-shaped sealing cavity, and the sealing cavity wraps the flange; anda valve arranged at a drainage hole formed in the bottom end of the lower-side cladding cover and a valve arranged at an emptying hole formed in the top end of the upper-side cladding cover are switched on, a fluororubber sealing material is added to the butt-joint position of the cladding covers and the connecting position of pipelines, bolts are fastened, the valve arranged at the drainage holeis switched off, nitrogen gas is injected into a nitrogen injection hole formed in the upper-side cladding cover for replacement, and after replacement is completed, a valve arranged at the nitrogeninjection hole and the valve arranged at the emptying hole are simultaneously switched off. The leakage position of the flange of the pipeline is wrapped through cooperation of the two cladding coverswhich are vertically and symmetrically arranged, a flange leakage point of the pipeline is blocked through the sealing cavity, gas leakage is prevented, the structure is very simple, operation is convenient and fast, and the practicability is high.

Description

technical field [0001] The invention relates to a low-temperature pipeline flange coating device and method, in particular to a natural gas pipeline flange coating device and method. Background technique [0002] Gas and oil pipelines are most likely to leak at the flange joints of two pipelines. Factors such as pipeline deformation, aging seals, and loose valves will cause leakage at the joints. At present, in the oil and gas pipeline flange leakage and plugging industry, there are generally two methods to deal with leakage: the first method is to stop production, replace the LNG (natural gas) gas in the pipeline, and then replace the new flange. The method of dealing with leakage takes a long time, increases the safety risk, and undoubtedly causes a certain economic loss; the second method needs to formulate a fixture of the corresponding size for the plugging of the flange, inject the sealing medium into the fixture, and use the sealing medium Wrap the flange and remove ...

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Problems solved by technology

At present, in the oil and gas pipeline flange leakage and plugging industry, there are generally two methods to deal with leakage: the first method is to stop production, replace the LNG (natural gas) gas in the pipeline, and then replace the new flange. The method of dealing with leakage takes a long time, increases the safety risk, and undoubtedly causes a certain economic loss; the second method needs to formulate a fixture of the corresponding size for the plugging of the flange, inject the sealing medium into the fixture, and use the sealing medium Wrap the flange and remove the fixture after the sealing medium is solidified, so as to play a sealing role. This method of dealing with flange leakage first requires a certain amount of time to make a fixture with a complex structure, and secondly, it is prone to sealing when injecting the sealing medium. The perforation between the medium leads to the failure of the seal, and this kind of sealing medium has poor low temperature resistance and low sealing success rate

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