Since metal pipes have a short life due to corrosion, it is best to use polypropylene pipes for water supply and drainage. But, when installing them, it is necessary to correctly perform the installation technique. The width of the ditch where the pipe will be laid should be larger than the width of the pipe for forty to fifty centimeters. The same conditions must be adhere to when laying sewer pipes.
You also need to pay attention to the soil. There should not be large stones at the bottom of the trench, but if there is a chance of shifting the soil, then geotextiles are laid out to the bottom. When installing the pipeline, you need to lay a special pillow of sand and gravel ten to fifteen centimeters thick. Pillow seal is carried out only in the immediate vicinity of the observation well. At the junction of water pipelines, pits are made. Pilling of pipelines is carried out with sand and small gravel at first around the perimeter by fifteen centimeters, and then, depending on the density of the soil, they are covered with twenty centimeters in small layers.
Pipe fastening is carried out using glue to the bell. To do this, you must first clean the joints. Another fastener method provides for welding with the contact method of VSTOK or in the bell. In order to connect a pipe made of polyethylene with a metal pipe, compounds from the flange are used. When laying sewer pipes through the walls of the wells as a sleeve, a coupling with a rubber ring is used as a sleeve.
Source – Epassion.