New Patching Method For Epoxy Coal Pitch Anti-corrosion Steel Pipes

1. After the surface pretreatment of the steel pipe in the patching part, primer should be applied within 8 hours. The primer should be even and no leakage should be allowed.

2. After the primer is dry, you can apply topcoat and wrap the glass cloth. If the weld is higher than 2mm, use topcoat and talcum powder to make a putty with suitable consistency. After the primer is dry, apply it on both sides of the weld. , and scraped into a transition surface. The connection between the glass cloth and the anti-corrosion layer of the pipe body shall not be less than 100mm.

3. For the anti-corrosion layer of epoxy coal tar anti-corrosion steel pipe with ordinary grade structure, the second top coat can be applied only after the first top coat has dried. The thickness of the anti-corrosion layer should be greater than or equal to 0.2mm.

4. The anti-corrosion layer of the reinforced epoxy coal pitch anti-corrosion steel pipe can be wrapped with glass cloth after the first coat of topcoat. The glass cloth should be tightened, the surface should be smooth, without wrinkles and bulges, and the width of the edge should be 30 to 40mm. After winding the glass cloth, apply the second topcoat. The amount of paint should be full, and all the mesh holes of the glass cloth should be filled with paint. After the second coat of topcoat has dried, the third coat of topcoat can be applied. The thickness of the anti-corrosion layer should be greater than or equal to 0.4mm.

5. The anti-corrosion layer of the extra-strength structure should be carried out according to the above-mentioned order of topcoat and one layer of glass cloth. The winding direction of the two layers of glass cloth should be opposite. After the third topcoat is dry, the fourth topcoat can be applied. The thickness of the anti-corrosion layer should be greater than or equal to 0.6mm.

mend injuries

1. For wounds where iron is not exposed, the damaged anti-corrosion layer should be removed first, and then topcoat and glass cloth should be applied according to the structure of the anti-corrosion layer of the pipe body. The overlap between the glass cloth and the anti-corrosion layer of the pipe body should not be less than 100mm.

2. For wounds exposed to iron, surface pretreatment should be carried out according to the requirements of repairing, and then the wounds should be repaired in the order required by the structure of the anti-corrosion layer of the pipe body.

3. Quality inspection

4. Appearance inspection: Visually inspect each patch and each patched area. The surface of the anti-corrosion layer should be smooth and free of wrinkles and bulges. The glass cloth mesh should be filled with topcoat.