Construction process for online inner coating protection of on-service underground pipeline and its special apparatus
A technology for underground pipelines and construction techniques, applied in the direction of pipe components, pipes/pipe joints/fittings, mechanical equipment, etc., can solve the problems of inability to prevent, high construction costs, and inability to construct long-distance pipelines online, and achieve extended service life, The effect of broad market prospects
Inactive Publication Date: 2008-12-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
[0011] Among them, the airflow coating method and the hose coating method need to be coated and hose coated under elevated temperature conditions, the process and tooling equipment are complex, and the construction cost is high; moreover, it cannot be used for online construction of long-distance pipelines at room temperature
The hose coating method still cannot prevent the further development of the existing localized corrosion perforation and corrosion cracking
Method used
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Embodiment Construction
[0055] The main construction equipment and tooling for underground pipeline leak plugging repair and internal coating anticorrosion of the present invention are engineering vehicles equipped for on-site or field operations, including: pigging equipment, online internal coating equipment, internal coating quality testing equipment, etc.
[0056] like Figure 6 Shown is a schematic diagram of a pipeline pig (Pig) pigging operation. Pigging equipment includes: engineering vehicle 1, pressure recorder 2, pig signal transmitter 3, PIG pig 4, engineering vehicle 1 is equipped with a generator and an air compressor, and the pipeline to be processed is connected with a pressure recorder 2. A pig signal transmitter 3 is provided on the PIG pig 4 in the pipeline to be treated.
[0057] Its working process is as follows:
[0058] (1) Use compressed air as the power to push the pig pipe pig with a cutter to remove the scale and rust in the pipeline. If necessary, it must be repeated until...
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The present invention relates to the construction process and apparatus for forming inner protection coating to on-service underground pipeline. The construction process includes the steps of pre-treatment, forming the leakage preventing layer, forming the inner protecting base coating and the facing layer. The step of forming the leakage preventing layer includes forming the bottom layer to block leakage and crack, sealing the surface micropores and micro crack and painting diluted micropore sealing layer. The step of forming the inner protecting base coating and the facing layer includes painting one inner protecting base coating and painting one facing layer. The apparatus for the construction includes pipeline cleaning apparatus, on-line inner coating apparatus and inner coating quality inspecting apparatus. The present invention is suitable for repairing various kinds of underground pipeline.
Description
technical field [0001] The invention relates to a repair technology for an in-service underground pipeline, in particular to an in-line inner coating protection construction process for an in-service underground pipeline. Background technique [0002] The oil, gas and water pipelines in service generally suffer from severe corrosion, scaling and early corrosion and cracking, which seriously affect normal production and even unreasonably early scrapping. [0003] This is clearly seen in the following typical cases. like Figure 1-2 The early corrosion perforation of the hot water pipeline is shown. The design life of the hot water pipeline is 30 years, but the actual service life is only 4 years. The most dense perforation: 22 corrosion perforations / m. like image 3 Shown, pipeline fouling (low flow rate); Figure 4 As shown, the fouling of pipelines and valves is an early failure situation. [0004] Research indicates( Figure 5 ), in the brine with high chloride ion co...
Claims
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IPC IPC(8): F16L55/162
Inventor 杜元龙彭海泉高立群
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI