The anti-corrosion effect of polyethylene heat shrinkable sleeve is irreplaceable by many similar objects. In order to give full play to its anti-corrosion and good shrinkage benefits, and also to better protect the pipe, what are its operation procedures?
1. Before sand blasting derusting, the surface of the steel pipe at the joint coating position should be preheated to at least 3 ℃ above the dew point, and the steel pipe surface should be kept dry. After sand blasting, the surface of steel pipe should reach Sa2.5.
2. The joint repair part of polyethylene heat shrinkable sleeve shall be cleaned, and the burr, welding slag, spatter, weld bead, and dirt and soil on the joint welding joint joint joint shall be removed.
4. The surface preheating will preheat the steel pipe surface at the joint coating to about 70-80 ℃. The surface of overlapping PE anticorrosive coating is preheated to 80-90 ℃ and roughened with wire brush.
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5. Install polyethylene heat shrinkable sleeve. After the primer is cured, heat the steel and lap PE layer. The temperature of primer steel reaches 80-90 ℃ and the temperature of PE layer reaches 100-110 ℃. Remove the film paper and plastic bag of the heat shrinkable sleeve. Heat it symmetrically to make it shrink. After shrinkage, it should be tempered for 5-8 minutes until the hot melt adhesive is fully melted. Check and eliminate bubbles.
6. Brush the primer, pour component B into component a tank, mix and stir thoroughly, brush evenly on the surface of steel pipe with brush, brush repeatedly, and drive out bubbles.
Thus, it can be seen that in the operation of polyethylene heat shrinkable sleeve, it is necessary to brush primer, clear sundries and preheat. These steps are indispensable. Therefore, it is necessary to brush primer, clean up sundries and preheat these steps during operation.
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