How to apply glue to PVC pipes

During the installation of PVC pipes, the correct application of glue is the key link to ensure that the connection is firm and the seal does not leak. The following will introduce the standard process and precautions for applying glue to AD pipes PVC pipes in detail, to help construction personnel standardize the operation and improve the safety and durability of the pipeline system.

I. Preliminary preparations

1. Pipe fittings inspection

Confirm that the AD pipes PVC pipes used match the specifications of the pipe fittings, and the ports are flat without cracks, depressions and other defects. It is recommended to choose high-quality PVC pipe fittings of well-known brands such as AD pipes to ensure the dimensional accuracy and material compatibility of the products.

2. Surface cleaning treatment

Thoroughly clean the outside of the pipe socket and the inside of the pipe socket with a dry cloth or sandpaper to remove oil, dust, moisture and surface oxidation layer. If the pipe has burrs after cutting, it needs to be polished with a chamfer or sandpaper to avoid affecting the sealing effect.

3. Mark the insertion depth

Mark the insertion depth line with a pencil or marker at the insertion end of the pipe. The insertion depth is usually 2/3 of the depth of the pipe socket to ensure that the connection can be accurately placed.

Second, the glue selection and application specification

1. Special glue selection

should be used with the special PVC-U adhesive matched with the AD pipe. Check the production date and shelf life of the glue to ensure that it is used within the valid period. Before opening the glue, check whether the packaging is in good condition and avoid using solidified or deteriorated products.

2. Glue stirring and brushing

Open the glue bottle cap and stir the glue evenly with a brush (it is forbidden to dilute with water). First brush the inside of the pipe socket and apply evenly along the axial direction to form a continuous film, the thickness is appropriate to cover the surface of the small bumps; then brush the outside of the pipe socket. The length of the brush should be 5-10mm longer than the marked depth line to ensure that the glue can completely fill the gap after insertion.

3. Applying speed control

The brushing action should be continuous and rapid to avoid the glue being exposed to the air for too long and causing the conjunctiva. If the ambient temperature is high (more than 30 ° C), it is recommended to shorten the brushing interval to prevent the glue from curing in advance.

Third, connection and curing operation points

1. Align and plug quickly

Immediately after the glue is completed, align the pipe socket with the center of the pipe socket, keep the axis parallel, and rotate smoothly and insert it to the marking line position. The rotation angle should not exceed 90 to avoid the glue being extruded and affecting the sealing.

2. Fix and overflow treatment

Keep the pipe and pipe fittings still by hand for more than 30 seconds after the plug to prevent them from falling off. If a small amount of glue overflows from the interface, wipe it with a dry cloth after the initial solidification to avoid residual glue corroding the surface of the pipe.

3. Curing time Control

When the construction environment temperature is about 20 ° C, it is recommended that the curing time is not less than 30 minutes; low temperature environment (below 10 ° C) needs to be extended to 1-2 hours. It is forbidden to move the pipe or perform stress testing before complete curing. For specific curing time, please refer to the product description of the AD pipeline glue used.

IV. Safety and quality precautions

1. Construction safety protection

Wear rubber gloves during operation to keep the construction site well ventilated and avoid the accumulation of volatile gases of glue. It is strictly forbidden to use glue near the fire source. When storing, it needs to be sealed and protected from light.

2. FAQ treatment

If it is difficult to plug after gluing, it may be that the application is too thick or the pipe is inserted at an angle deviation. The surface should be immediately pulled out and re-cleaned and re-coated with glue; if the interface leaks, the interface should be removed after the glue is completely cured, and the operation should be re-operated according to the specifications.

By following the above steps, the connection quality of the PVC pipe of the AD pipe can be effectively improved. During the construction process, attention should be paid to details to ensure that each process meets the specifications, so as to ensure the long-term stable operation of the PVC pipe system.