Deepwater wet heat-insulation anode pipeline and method for manufacturing same

Abstract

The invention discloses a deepwater wet heat-insulation anode pipeline and a method for manufacturing the same. The deepwater wet heat-insulation anode pipeline comprises a steel pipe, a sintered epoxy powder anticorrosion coating, a vacuum heat-insulation layer, a wet heat-insulation layer and bracelet anodes; the sintered epoxy powder anticorrosion coating, the vacuum heat-insulation layer, the wet heat-insulation layer and the bracelet anodes are sequentially arranged on the outer surface of the steel pipe; the vacuum heat-insulation layer comprises two semicircular vacuum heat-insulation plates which are radially symmetrically adhered on the surface of the sintered epoxy powder anticorrosion coating and are integrally buried in the wet heat-insulation layer; composite polyurethane is integrally poured and is solidified to form the wet heat-insulation layer; the two semicircular bracelet anodes are inlaid in the wet heat-insulation layer in an embracing manner, the outer surfaces of the bracelet anodes are lower than the outer surface of the wet heat-insulation layer, and wires of the bracelet anodes are buried in the wet heat-insulation layer and are connected with the steel pipe. The deepwater wet heat-insulation anode pipeline and the method have the advantages that the deepwater wet heat-insulation anode pipeline is reasonable in structure, simple in manufacture, good in integral sealing performance and excellent in practicality, the applicable temperature of the deepwater wet heat-insulation anode pipeline can reach 150 DEG C, and the maximum applicable water depth of the deepwater wet heat-insulation anode pipeline can reach 3000m.

Description

technical field [0001] The invention relates to corrosion protection of a deep-water oil and gas transportation pipeline, more specifically, the invention relates to a deep-water wet-type thermal insulation anode pipeline which can be used in severe marine corrosive environments and has a good protection function and a manufacturing method thereof. Background technique [0002] The ocean is a harsh corrosive environment. Therefore, the carbon steel pipeline used for submarine oil and gas transportation is prone to external corrosion under the joint action of soil, sea mud and seawater in the ocean. Therefore, corrosion protection of the pipeline is essential. Only Only by doing this work well can the service life of the pipeline be extended, thereby ensuring safe production and improving comprehensive economic benefits. [0003] In general, carbon steel pipelines for subsea oil and gas transportation often use external anti-corrosion coatings and cathodic protection for join...

AI Technical Summary

Problems solved by technology

The pipeline is complicated to set up, difficult to construct, difficult to guarantee the quality, has great limitations in the use area, and has the following defects:

[0005] (1) In order to maintain the overall waterproof effect of the outer protective layer, when installing the bracelet-type anode, the wire can only be extended along the pipe surface of the outer protective layer of the pipeline to the end of the pipe and then connected to the inner steel pipe. The wire of the bracelet-type anode protrudes from the surface of the outer protective layer, which brings difficulty to the waterproof protection of the wire part, not only cannot guarantee the waterproof effect of the waterproof cap, but also makes the insulation layer easy to enter water and fail

[0006] (2) The bracelet-type anode is installed on the outer surface of the outer protective layer at a distance of 1500mm from the end of the steel pipe. With such an arrangement, the length of the concrete counterweight layer at the end of the steel pipe where the anode is installed is less than 1000mm, which weakens the concrete distribution of this part. The anti-slip ability between the heavy layer and the outer protective layer, and therefore it is easy to cause the concrete counterweight layer to slip during the pipeline laying process, which in turn leads to the slippage of the waterproof cap and the breakage of the anode wire, resulting in the scrapping of the entire pipe. It must be cut off and replaced again, seriously affecting the efficiency of pipeline laying

[0007] (3) The insulation layer is made of rigid polyurethane foam, and its density is only 80-100kg / m under normal circumstances 3 , its compressive strength is only 0.65-0.85MPa, and its applicable temperature does not exceed 100°C, so it is only suitable for use in shallow water with a water depth of no more than 60 meters, and it is not enough to resist the hydrostatic pressure when the water depth exceeds 60 meters

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