Year1
- 规格：
- 219-3500mm
- 规格：
- 6-28
- 型号：
- sy/t5037-2012
_ Steel pipe anti-corrosion and anti-corrosion wrapping tape is a new type of anti-corrosion material for steel pipe welds with good performance and easy operation. It is composed of double layers of base material and hot melt adhesive layer. The base material is a plastic sleeve (sheet) formed by extrusion, radiation cross-linking and stretching of polyethylene raw materials. Hot melt adhesive is a special adhesive. It is solid at room temperature. When heated, it becomes a molten state that can flow and be coated on the substrate. Good adhesion to metals and plastics. The external anti-corrosion layer of steel pipes is usually a three-layer structure (also called three-layer anti-corrosion). The anti-corrosion paint primer is in contact with the steel pipe). There is hot melt glue in the middle. The outermost layer is cross-linked polyethylene. In a few cases, the outer anti-corrosion layer of the steel pipe is also used as a second layer (two-layer anti-corrosion). The one in contact with the steel pipe is sealed with hot melt adhesive and the outer layer is cross-linked polyethylene. The anti-corrosion jacket is composed of a foam jacket cover (inner layer), hot melt adhesive (middle layer) and base material (outer layer). For technical requirements, please refer to the oil and gas industry standards/"Technical Standards for Polyethylene Anti-corrosion Layers of Buried Steel Pipelines"/Radiation Cross-linked Polyethylene Heat Shrinkable Tapes
(Sleeves)"/"Rigid Polyurethane Foam Plastics for Buried Steel Pipelines Technical Standard for Anti-Corrosion Insulation Layer". Anti-corrosion wrapping tape requirements for anti-corrosion hot wrapping tape for oil and gas transmission steel pipes, and general requirements for steel pipe repairing construction. The repairing area must be cleaned before repairing. Clean the burrs, welding slag, dirt, oil and debris in and around the circumferential weld. Carry out rust removal treatment on the surface of the repaired parts. The quality of the surface rust removal treatment should meet the requirements of the "Rust Level and Rust Removal Level of the Steel Surface Before Painting". ~. class. Sandblasting or power tools can be used to remove rust. The polyethylene layer at the patched overlapping area should be polished until the surface is rough. The ends are beveled. The ends of the slope corners are beveled. The slope angle is not greater than degrees
. Then use a flame heater to preheat the patching area. The overlap width of the anti-corrosion and anti-corrosion wrapping tape and the polyethylene anti-corrosion layer should be no less than 1. Construction should be stopped if the humidity is greater than % or if it rains or snows. ,
Quality inspection after construction
Quality inspection of anti-corrosion and anti-corrosion wrapping tape. The appearance of the patching should be checked one by one. The anti-corrosion heat shrink wrapping surface should be smooth, flat, without wrinkles and bubbles. The slope corners at both ends fit closely with the heat shrink sleeve. No gaps. There is no carbonization on the surface. The anti-corrosion wrapping tape should have hot melt adhesive overflowing evenly in the circumferential direction. Use a spark leak detector to inspect pinholes one by one at the repaired joints. Leak detection voltage. If pinholes appear. The mouth should be refilled. The adhesive strength of anti-corrosion and anti-corrosion wrapping tape should meet the requirements. The peel strength when the pipe body temperature is about 10°C should not be less than /.
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