Intermediate-frequency heating repaired opening construction technology for thermal contraction band of buried steel pipeline

A heat-shrinkable tape and construction technology technology, applied in the direction of pipe components, pipes/pipe joints/fittings, machinery and equipment, etc., can solve the problems of decreased adhesion of epoxy primers, insufficient melting of hot melt adhesives, slow heating up, etc. , to achieve the effect of improving the efficiency and quality of the repairing construction, ensuring the quality of the repairing anti-corrosion layer, and improving the overall quality

Inactive Publication Date: 2012-09-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the heat-shrinkable tape joints of buried pipelines are generally heated by manual flames. The existing problems are: direct flame heating will cause secondary pollution on the surface of the pipe body, resulting in a decrease in the adhesion of the epoxy primer; flame heating is difficult. Ensure that the pipe body is heated evenly and the heating temperature is insufficient due to human factors, often resulting in insufficient or partial melting of the hot melt adhesive, resulting in a decrease in the sealing performance of the heat shrinkable tape or even a failure of the seal; especially in winter construction, due to the low ambient temperature, the pipeline Fast heat dissipation, slow temperature rise, and long heating time seriously affect the efficiency of pipeline construction
However, this technology will still cause secondary pollution on the surface of the pipe body, resulting in a decrease in the adhesion of the epoxy primer and the lack of ensuring that the pipe body is heated evenly.

Method used

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  • Intermediate-frequency heating repaired opening construction technology for thermal contraction band of buried steel pipeline
  • Intermediate-frequency heating repaired opening construction technology for thermal contraction band of buried steel pipeline
  • Intermediate-frequency heating repaired opening construction technology for thermal contraction band of buried steel pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1. In conjunction with accompanying drawing concrete implementation process description:

[0051] The pipe heat shrinkable joint construction technology with intermediate frequency heating is a dry film heat shrinkable joint construction process with intermediate frequency heating.

[0052] The construction process of dry film heat shrinkable joints with intermediate frequency heating (see figure 1 )for:

[0053] 1) Defect cleaning of welding joints and factory prefabricated anti-corrosion coatings: remove welding slag, dirt, and impurities at the repairing joints, and deal with defects existing in the overlapping areas of factory pre-fabricated anti-corrosion coatings;

[0054] 2) Sand blasting and rust removal of pipe body: rust removal grade Sa2.5; anchor pattern depth 80μm;

[0055] 3) Intermediate frequency preheating tube body: preheating temperature 60°C;

[0056] 4) Brushing primer: the thickness of the primer is more than 200μm;

[0057] 5) The s...

Embodiment 2

[0088] Embodiment 2. This example is the construction process flow of wet film heat shrinkable band intermediate frequency heating filling joint (see figure 2 ), it differs from the dry film heat shrinkable belt intermediate frequency heating joint construction process only in that: the surface roughening treatment of the factory prefabricated anti-corrosion layer is carried out in advance after the pipe body is blasted and derusted, which is the third step, other processes same.

[0089] in:

[0090] The specific methods of welding joints and factory prefabricated anti-corrosion layer defect cleaning, pipe body sandblasting and rust removal, intermediate frequency preheating pipe body, intermediate frequency secondary heating and air bubble removal are the same as in Example 1, except that

[0091] The scope of primer painting in the primer: when the wet film is installed, the metal of the joint pipe body and the overlapping area of ​​the factory prefabricated anti-corrosio...

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Abstract

The invention relates to an intermediate-frequency heating repaired opening construction technology for a thermal contraction band of a buried steel pipeline. The construction technology comprises the following steps: 1) cleaning flaws of a welded junction and an anticorrosive layer prefabricated in a factory; 2) performing sand-blasting and de-rusting on a pipe body, wherein a de-rusting level is Sa2.5 level and an anchoring grain depth is 50 microns to 100 microns; 3) performing intermediate-frequency heating on the pipe body, wherein a preheating temperature is at 50-90 DEG C; 4) painting a primer, wherein the thickness of the primer is above 200 microns; 5) performing napping treatment on the surface of the anticorrosive layer prefabricated in the factory, in a flame manual steel wire brushing napping mode; 6) mounting the thermal contraction band: winding the thermal contraction band at the repaired opening, sticking a fixing sheet, and baking the surface till the thermal contraction band is completely and seamlessly covered on the pipe body; 7) secondarily intermediate-frequency heating under a secondary heating temperature at 100-130 DEG C, till fully melting a hot melt adhesive; and 8) removing air bubbles. According to the construction technology provided by the invention, the heating temperature is uniform, the influences of personal factors on construction quality are reduced and the efficiency and quality of repaired opening construction are greatly increased.

Description

technical field [0001] The invention relates to a joint construction process for buried steel pipeline heat shrinkable with intermediate frequency heating suitable for intermediate frequency heating, and relates to the technical fields of general anticorrosion of metal materials and pipeline systems. Background technique [0002] At present, the heat-shrinkable tape joints of buried pipelines are generally heated by manual flames. The existing problems are: direct flame heating will cause secondary pollution on the surface of the pipe body, resulting in a decrease in the adhesion of the epoxy primer; flame heating is difficult. Ensure that the pipe body is heated evenly and the heating temperature is insufficient due to human factors, often resulting in insufficient or partial melting of the hot melt adhesive, resulting in a decrease in the sealing performance of the heat shrinkable tape or even a failure of the seal; especially in winter construction, due to the low ambient ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/168
Inventor 叶春艳董彬周号张鹏周广言李海坤刘全利郭敏利韩钟琴
Owner BC P INC CHINA NAT PETROLEUM CORP
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