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How to quickly and efficiently repair the external anti-corrosion coating of buried pipeline

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Author : PARIS-Terry Ding
Update time : 2020-11-26 15:53:06
For damage (including pinhole) with diameter less than 30mm, hot melt adhesive and polyethylene patch shall be adopted.

For damage with diameter greater than 30mm, viscoelastic anti-corrosion adhesive tape + double-layer polypropylene reinforced fiber tape is adopted

1st  Surface  deal:
1.Remove the soil on the exposed pipe section to make the anticorrosive coating defects fully exposed. Measure and record the size and position of the defects, and take photos of the defects.
2. Repair the anticorrosive coating at the defect and remove the peeled anticorrosive coating (if it is found that the 3PE external anti-corrosion coating is stripped in a large area, it shall be reported to the owner in a hurry so as to consider appropriate treatment implementation), and the pipe body with rust shall be completely exposed;
3. The surface of the exposed pipe body shall be treated, and the corrosion products shall be cleaned up to grade ST2;
4 The dirt on the surface of the anticorrosive coating in the scope of 0 mm and the need for ring wrapping shall be cleaned, the edge of the defective coating shall be trimmed into obtuse angle groove, the surface of the pipe body at the defect of the anticorrosive coating shall be manually derusted, filled with hot melt adhesive, and patched with patch. The polyethylene surface shall be roughened

2nd  Defect repair:
Repair of damage with diameter less than 30mm:
① preheat the treated pipe surface and the surrounding anti-corrosion coating, coat the melted hot-melt adhesive on the surface of the pipe body until the thickness of the surrounding polyethylene anti-corrosion coating is filled, and then quickly paste the polyethylene patch;
② the size of the polyethylene patch shall ensure that the distance between the edge of the polyethylene coating and the edge of the polyethylene coating is not less than 100 mm, and the four corners are cut into rounded corners
③ During patching, the hot melt adhesive of the patch shall be baked until it is melted, and then it shall be covered on the defect surface of the anti-corrosion coating filled with hot-melt adhesive. The hot-melt adhesive shall be fully melted until the adhesive around the patch is evenly overflowed.

Repair of damage with diameter greater than 30mm:
① before the construction of viscoelastic anti-corrosion tape, ensure that the repair area is dry;
② apply the viscoelastic anti-corrosion tape in turn, and roll and remove the air;
③ the overlapping width of viscoelastic anti-corrosion tape is not less than 1cm, which can be lapped along the inner side of the tape during construction; the bonding between viscoelastic anti-corrosion tape and polyethylene coating around the defect After the construction, the length of the adhesive tape shall not be less than 100 mm;
④ After the construction of viscoelastic anti-corrosion tape is completed, the appearance and leakage detection shall be carried out in a hurry
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