a mouth filling method
A technology for patching and patching, which is applied in the field of patching, can solve the problems of debonding and cracking, low molecular weight, limited hot melt adhesive pressure, etc., and achieves improved bonding strength, high quality stability, and strong rust resistance Effect
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Embodiment 1
[0047] A Ф610 3LPP pipeline, the thickness of the prefabricated anti-corrosion layer is 3mm, the width of the patch 5 is 400mm, and the thickness is 3.3mm. The patching method includes the following steps:
[0048] a. Surface treatment: Decontamination and sand blasting are carried out on the surface of the steel pipe at the joint part of the pipeline. The surface quality of the steel pipe should reach Sa2.5 level. After sand blasting and derusting, the dust on the surface of the steel pipe is cleaned with compressed air;
[0049] b. Steel pipe preheating: preheat the steel pipe at the joint of the pipe to 75°C;
[0050] c. Wrapping of patch 5: Wrap patch 5 on the patching part of the pipeline. The material of patch 5 is a 4:1 blend of polypropylene and maleic anhydride grafted polypropylene copolymer. There is an arc-shaped groove in the middle of the width direction of the sheet 5 (along the axial direction of the pipeline), and the deepest part of the groove is 1.5mm, and i...
Embodiment 2
[0061] A 3LPE pipe with a diameter of Ф1219, the prefabricated anti-corrosion layer at both ends has a thickness of 3.7 mm, the joint patch 5 has a width of 450 mm, and a thickness of 4.6 mm. The joint joint method includes the following steps:
[0062] a. Surface treatment: Decontamination and sand blasting are carried out on the surface of the steel pipe at the joint of the pipe, so that the surface quality of the steel pipe reaches Sa2.5 level. After derusting, the dust on the surface of the steel pipe is cleaned with compressed air;
[0063] b. Steel pipe preheating: preheat the steel pipe at the joint part of the pipe to 50°C;
[0064] c. Coating of the joint patch 5: wrap the joint patch 5 on the surface of the pipeline patch part, the material of the joint patch 5 is a maleic anhydride grafted polyethylene copolymer, and the grafting rate is 0.25wt%; There is an arc-shaped groove in the middle of the width direction of the sheet 5 (along the axial direction of the pipel...
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