After the polyurethane insulated steel pipe is welded, the interface shall be filled. The following is the interface processing flow.

　　1、 Ensure that the pipe is qualified for welding and surface treatment. Before installation, the soil and dirt inside and outside the casing and at both ends of the pipe shall be removed to ensure that the plastic bonding parts are clean.

　　2. Cut off the polyethylene thick sheath, with a width of (60cm) of 3-5cm around the length of the insulation pipe. Determine the lap size of the joint sleeve and the polyethylene outer sleeve, place the joint sleeve at the joint, make sure the outer sleeve is in the middle, and then install the heat shrinkable tape.

　　3 (10cm * 1.5mm) heat shrinkable tape seal joint, one week (winding and overlapping of both ends 3-5cm, transverse joint cover of middle heat shrinkable tape) remove the dirt and dirt on the heat shrinkable sleeve and the rubber part of the shell. The width larger than the width of the heat shrinkable tape is to clean the oil with alcohol essence, and roughen the joint part. The roughening width is larger than the width of the heat shrinkable tape.

　　The bonded area with water shall be dry or dry with a drying lamp.

　　2. Installation

　　Pu insulated steel pipe maintenance construction drawing

　　(1) Determine the lap length of heat shrinkable tape and heat shrinkable sleeve.

　　(2) Cut off the length of the heat shrinkable tape.

　　(3) Cut off the chamfer of one end of the heat shrinkable tape by 50 × 15mm.

　　(4) The heat shrinkable tape shall be covered inward at the joint to ensure that the heat shrinkable tape is centered at the joint.

　　(5) use the first round two layers of the small heat to shrink the roast and the thigh on the top of the thigh. Then the roast glands are buckled on the joint and then evenly roasted through the fire until the whole heat shrinkable tape is used without the edge and foam. The heating gloves or the pressure roller smooth gland heat shrinkable band can be tightly combined during the heating process.

　　(6) After pressing the gland, bake the overlapped side of the shell from the middle of the heat shrinkable belt. Bake from the bottom and follow the baking rules, from bottom to top, from inside to outside, so as to avoid froth.

　　(7) Adjust the flame length of the spray gun, heat uniformly along the middle of the heat shrinkable zone, and heat both ends successively after the middle shrinkable. In the process of heating, the spray gun shall move back and forth to ensure that the heat shrinkable belt is not hot locally.

　　(8) When heating shrinkage, carefully observe whether there is hot melt adhesive overflow at the edge of the heat shrinkage belt.

　　(9) After shrinkage, check the heat shrinkable belt and gland again for warping and bubbles. If any, repair and remove bubbles in time to ensure that the heat shrinkable belt and gland are smooth.

　　4. After the trunk is sealed, make sure to open the hole and add black and white mixture. Black is black, red is white.

　　5. Take the container and pour the black material, white material / black-and-white material ratio of 1:1.1 into the filler hole to form polyurethane foam. Sealing is completed after foaming. Note: About 267 heat preservation pipes (black and white mixing 0.6kg)

　　The above is the relevant content introduced by the small edition of polyurethane insulated steel pipe manufacturer. If you want to know more, please visit the website: https://www.sdhpgy.com