DN300 waterproof casing flexible waterproof casing rigid waterproof casing

Although the flexible waterproof casing seems simple, it is even regarded as a device by many manufacturers. As long as it is produced according to the size of the atlas, there will be no problems at all. But this may only be applicable to small-diameter flexible waterproof casings, and it will never be certain that there will be no problems.
When producing large-diameter flexible waterproof casings that are not marked in the atlas, the manufacturer needs to roughly estimate the size based on the outer diameter and inner diameter conversion method, and should communicate with the technical personnel at the project site in a timely manner. Different steel pipe manufacturing processes or differences in standards greatly affect the outer diameter of the steel pipe. If you are not careful, the rubber sealing ring will be too large or too small, causing the production to be canceled, delaying time and wasting costs. This is Something to note.
Secondly, a lot of attention needs to be paid to the installation of large-diameter flexible waterproof casing, because it cannot be easily operated by conventional small-diameter workers. Its gravity will cause the pipe to fall, and devices should be set up in advance to prevent it from falling. Cause displacement to the pipeline. In addition, due to the large outer diameter of the rubber ring, the diagonal method should be used when tightening the bolts to avoid uneven stress on the rubber ring. Before pouring concrete, a water seepage and leakage test should be done in advance to ensure that it is correct before pouring, otherwise the consequences will be disastrous.
The above are the precautions when making and installing large-diameter flexible waterproof casing. I hope it can help everyone.