Natural gas pipeline anti-corrosion structure laid underwater

Abstract

The utility model relates to a natural gas pipeline anticorrosion structure laid underwater, which comprises a pipeline body laid on the seabed, an anticorrosion layer, a sacrificial anode layer and a protective layer, the pipeline body comprises a steel pipe, the steel pipe is wrapped with a reinforced grade 3PE anticorrosion layer, the anticorrosion layer is uniformly wrapped with the sacrificial anode layer, and the protective layer is arranged on the outer side of the steel pipe. A protective layer is arranged outside the sacrificial anode layer; compared with the prior art, the utility model has the advantages that the aluminum alloy sacrificial anode layer is additionally arranged outside the steel pipe anti-corrosion layer, the modified glass fiber reinforced plastic protective layer is arranged outside the sacrificial anode layer, pipeline welding is carried out on the coast, and the anti-corrosion layer, the sacrificial anode layer and the protective layer are mounted, so that the pipeline laying construction at the seabed is simple; the steel pipe has very high insulating property, mechanical damage resistance and better marine environment corrosion resistance, the service life of the gas pipeline is greatly prolonged, and accidents are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe anti-corrosion, in particular to an anti-corrosion structure of a natural gas pipeline laid underwater. Background Art

[0002] In recent years, the number of natural gas pipelines laid on the bottom of waters has gradually increased, and steel pipes are mostly protected by the following anti-corrosion methods: First, the outer wall of the steel pipe adopts an external anti-corrosion layer: such as a reinforced fused epoxy powder outer coating or a reinforced 3PE anti-corrosion layer; second, a cathodic protection form of a sacrificial magnesium anode package is adopted. Since laying pipelines on the seabed is difficult, the construction is difficult. In summary, the anti-corrosion methods mentioned above show that steel pipelines are very easy to corrode. Once the steel pipe is severely corroded, it will cause leakage accidents. For this reason, we have specially proposed a technical solution for the anti-corrosion structure of natural gas pipelines laid underwater. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides an anti-corrosion structure for a natural gas pipeline laid underwater, which has a reasonable structure, can greatly extend the service life of the steel pipe, and effectively reduce the occurrence of accidents.

[0004] In order to achieve the above-mentioned utility model purpose, the technical solution adopted by the utility model is: an anti-corrosion structure of a natural gas pipeline laid underwater,

[0005] It includes a pipeline body laid on the seabed, an anti-corrosion layer, a sacrificial anode layer and a protective layer. The pipeline body includes a steel pipe, the outside of the steel pipe is wrapped with a reinforced 3PE anti-corrosion layer, the outside of the anti-corrosion layer is evenly covered with a sacrificial anode layer, and the outside of the sacrificial anode layer is provided with a protective layer.

[0006] As improvement 1: the material of the sacrificial anode layer is aluminum alloy sacrificial anode material.

[0007] As improvement 2: the sacrificial anode layer is evenly coated on the outer layer of the steel pipe anti-corrosion layer.

[0008] As improvement 3: the material of the protective layer is modified glass fiber reinforced plastic material.

[0009] Compared with the prior art, the utility model has the following advantages: an aluminum alloy sacrificial anode layer is added to the outside of the steel pipe anti-corrosion layer, and a modified fiberglass protective layer is provided outside the sacrificial anode layer, so that the steel pipe has very high insulation performance, mechanical damage resistance, and good marine environment anti-corrosion performance, the service life of the gas pipeline is greatly extended, and the occurrence of accidents is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of an anti-corrosion structure of a natural gas pipeline laid underwater according to the utility model;

[0011] Reference table of reference numerals:

[0012] 1-steel pipe, 2-anticorrosion layer, 3-sacrificial anode layer, 4-protective layer DETAILED DESCRIPTION

[0013] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0014] like Figure 1 As shown, an anti-corrosion structure of a natural gas pipeline laid underwater includes a steel pipe body 1 laid on the seabed, an anti-corrosion layer 2, a sacrificial anode layer 3 and a protective layer 4, the pipeline body 1 includes a steel pipe 5, the steel pipe 5 is externally wrapped with a reinforced 3PE anti-corrosion layer 2, the anti-corrosion layer 2 is externally uniformly coated with a sacrificial anode layer 3, and the sacrificial anode layer 3 is externally provided with a protective layer 4.

[0015] The sacrificial anode layer is made of aluminum alloy sacrificial anode material.

[0016] The sacrificial anode layer is evenly coated on the outer layer of the steel pipe anti-corrosion layer.

[0017] The material of the protective layer is modified glass fiber reinforced plastic material.

[0018] During the specific implementation of the utility model, the steel pipe 5 is firstly made of the reinforced 3PE anti-corrosion layer 2 in the factory, and then transported to the seaside to be welded and connected. After the weld is sandblasted and rusted, a heat shrink sleeve is used for anti-corrosion patching. The outside of the reinforced 3PE anti-corrosion layer 2 is evenly covered with an aluminum alloy sacrificial anode layer 3 to provide cathodic protection for the steel pipe; a modified glass fiber reinforced plastic material protective layer 4 is added to the outside of the sacrificial anode layer 3 for protection.

[0019] Construction conditions: The outer reinforced 3PE anti-corrosion layer of the steel pipe should be inspected, and only after it passes the inspection can the aluminum alloy sacrificial anode layer be wrapped.

[0020] After the sacrificial anode layer is constructed and qualified, the modified FRP material protective layer is constructed. The pipeline surface must be kept dry, the pipeline surface temperature must be higher than 5°C and lower than 40°C, and the construction must be carried out in an environment without ultraviolet rays. The pipeline should be about 50cm above the ground for easy construction.

[0021] Construction requirements: Pre-treat the pipeline anti-corrosion layer and keep it clean; construct the aluminum alloy sacrificial anode layer, keep the surface flat and clean after construction, and then construct the modified fiberglass material protective layer, evenly covering the outer surface of the pipeline sacrificial anode layer without wrinkles; the overlapping part of the end is 8-9cm; after the construction is completed, expose it to the sun for 40 minutes for full curing; use ultraviolet light for curing at night or on cloudy days.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-corrosion structure for a natural gas pipeline laid underwater, characterized in that: The invention comprises a pipeline body (1) laid on the seabed, an anti-corrosion layer (2), a sacrificial anode layer (3) and a protective layer (4), wherein the pipeline body (1) comprises a steel pipe (5), the steel pipe (5) is externally wrapped with a reinforced 3PE anti-corrosion layer (2), the anti-corrosion layer (2) is externally uniformly coated with a sacrificial anode layer (3), and the sacrificial anode layer (3) is externally provided with a protective layer (4).

2. The anti-corrosion structure of a natural gas pipeline laid underwater according to claim 1, characterized in that: The sacrificial anode layer (3) is made of aluminum alloy sacrificial anode material.

3. The anti-corrosion structure of a natural gas pipeline laid underwater according to claim 1, characterized in that: The sacrificial anode layer is evenly coated on the outer layer of the steel pipe anti-corrosion layer.

4. The anti-corrosion structure of a natural gas pipeline laid underwater according to claim 1 is characterized by: The material of the protective layer is modified glass fiber reinforced plastic material.

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