Protection methods for LNG pipelines transported by sea to extremely cold regions
A technology for liquefied natural gas and cold areas, which is used in the marine transportation of LNG pipelines and the protection field of LNG pipelines in extremely cold areas, to save the cost of cleaning, protection and maintenance, and improve the effect of protection and maintenance.
Active Publication Date: 2020-12-08
OFFSHORE OIL ENG QINGDAO +1
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Problems solved by technology
[0004] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and provide a protection method for liquefied natural gas pipelines transported by sea to extremely cold regions, which not only effectively prevents steel structure modules such as liquefied natural gas from being The pollution of impurities to the pipeline and the corrosion of the inner wall of the pipeline by humid air solve the problem of subsequent cleaning of the pipeline and save the cost of cleaning, protection and maintenance of the pipeline; moreover, it improves the protection and maintenance effect of steel structure modules such as liquefied natural gas during shipping
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[0044] Such as figure 1 Shown, the present invention adopts following steps:
[0045] Step 1: Spray gas-phase corrosion inhibitor into the non-sealed carbon steel pipeline to protect the pipeline;
[0046] Vapor phase antirust agent is also known as: Vapor phase antirust powder, which is sprayed in the form of powder or mist. Vapor-phase corrosion inhibitor, at room temperature, the gas emitted automatically is adsorbed on the surface of the metal, which can inhibit the atmospheric corrosion of the metal. Because the gas-phase corrosion inhibitor does not need to directly contact the metal surface, it can make the surface, inner cavity, and Pipelines and even gaps can be protected, and have the advantages of long anti-rust period, easy operation, low cost and wide application range.
[0047] Now take the vapor phase corrosion inhibitor VpCI-337W as an example to introduce its application method. It is a water-based antirust spray. The liquid is light red. It is atomized and...
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A protection method for liquefied natural gas pipelines transported by sea to extremely cold regions, the following steps are adopted: 1: spray a gas-phase corrosion inhibitor into the unsealed carbon steel pipelines, and seal the carbon steel pipelines; Put a desiccant inside the carbon steel pipeline and seal the pipeline; three: fill the inside of the closed pipeline with nitrogen for protection; four: seal and protect the end of the pipeline preserved by sea. The invention not only effectively prevents the pollution of external impurities to the pipeline and the corrosion of the inner wall of the pipeline by humid air during the sea transportation of steel structure modules such as liquefied natural gas, solves the problem of subsequent cleaning of the pipeline, and saves the cost of cleaning, protection and maintenance of the pipeline ; Moreover, the protection and maintenance effect of steel structure modules such as liquefied natural gas during sea transportation is improved.
Description
technical field [0001] The invention relates to marine transportation of liquefied natural gas pipelines, in particular to a protection method for marine transportation of liquefied natural gas pipelines to extremely cold regions. It belongs to the field of offshore oil engineering. Background technique [0002] At present, for liquefied natural gas and other steel structure modular construction projects, the construction is generally completed in modules at the construction site first, and then the modules are transported by sea to the destination for assembly. This places demands on the protection of the modules during sea transport. If the protection of the sea transportation is not good, the pollution of the pipeline by external impurities and the corrosion of the inner wall of the pipeline by the humid air cannot be avoided, which will inevitably lead to subsequent cleaning of the pipeline. In this way, it not only wastes manpower and material resources, but also incr...
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IPC IPC(8): F17D5/00
CPCF17D5/00
Inventor 刘传丰徐庚向娟王娴姬晓东冷涛田王金豪刘超祁德路仝强崔爱娥杨丽丽邓推姜维吕文斌
Owner OFFSHORE OIL ENG QINGDAO