1. Surface Rust Removal
Scrape off loose rust and paint from the workpiece surface using a wire brush. Optional use of power tools to remove rust, old paint, and foreign matter selectively.
2. Apply complementary primer coat
1) Apply primer by hand, brush, wearing gloves, or with a roller.
2) Apply a thin layer of primer evenly on the surface of the workpiece to be wrapped with tape.
3) Apply more primer to the holes, shoulders, gaps, and pipe threads of the workpieces.
4) For narrow threads and gaps, it's advisable to use a brush for application.
3. Apply matching putty.
1) For parts with complex shapes like valves, flanges, and pipe fittings, you can use putty to shape them to prevent bridging or voids when wrapping tape later.
2) Apply putty using a putty knife or with gloves.
3) Smooth out the uneven surface and remove air from the holes.
4) Apply at least 100mm above the existing anti-corrosion coating.
4. Coated mineral oil tape
1) Use oil tape with spiral wrapping, ensuring each wrap overlaps the previous one by at least 25.4mm (1"). For extreme environmental conditions, a 55% overlap can be used to provide double protection.
2) If the construction space is too narrow, consider applying the tape vertically, like wrapping "cigarettes." Ensure there's at least a 100mm (4") overlap, and position the overlap on the top side of the pipe for a "rabbet"-like protective effect.
3) When wrapping, be sure to hold the starting end tightly so it adheres closely to the workpiece surface. Avoid allowing the tape to extend too far, as this can cause wrinkles and gaps. Therefore, it is required to maintain a consistent tension throughout the wrapping process.
4) Maintain sufficient tension for a continuous, smooth surface. Be careful not to stretch the tape. As it wraps, flatten any wrinkles and bubbles that appear.
5) Ensure a minimum overlap of 100mm (4") between tape joints, with the joint positioned on the upper half of the pipe. After wrapping each roll, press the overlap flat along the spiral wrap direction by hand.
6) For workpieces in a vertical direction, start wrapping from the bottom up to achieve a protective effect similar to a "eaves board."
7) When flattening tape and edges, apply a small amount of primer to your hands or gloves for easier handling, especially in cold weather or on cold workpieces. This method is particularly recommended for use on steel structures.
