Material selection for buried water supply pipes
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Dear friends: We have a project under planning, and the water used in this project will mainly come from recycled water, river water, groundwater, softened water, and other sources. Preliminary plans have been made for several larger water pipes in the project. Among them, the supply and return pipes for the circulating water system are installed overhead, and all of them are spiral pipes with a diameter of DN300. There is also a main river water supply pipeline with a diameter of DN300, which is planned to be buried underground. Previously, in our engineering projects, all pipes were made of steel; we had limited experience with them, and we had never used other types of pipes. In recent years, I’ve seen that many households use buried pipes made of other materials, rather than steel pipes. Dear friends, the main water supply pipeline for our project has a diameter of DN300 and a total length of 100 meters. The pressure in this main pipeline is quite low, around 0.2 MPa ； It is planned to use a buried installation; I’m not sure what kind of pipeline would be suitable ? If steel pipes are used, what anti-corrosion measures are required? ?
If steel pipes are used, anti-corrosion measures of three coats of oil and four layers of cloth are required; if PE is used, no anti-corrosion treatment is needed.
For the supply and return pipes of circulating water systems, overhead installation is less energy-efficient than buried installation
The pressure of 0.2 is very low; is there negative pressure? If the negative pressure is high, there’s no need to consider PE pipes – using steel pipes is a better long-term solution. The steel pipes need to be protected against corrosion, and straight-buried expansion joints should be installed every 100 meters.
There is no doubt that polyethylene (PE) pipes should be chosen. In the event of negative pressure, pipes with a thicker wall thickness, such as those in the PN1.0MPa series or higher, can be used; it is possible to have these pipes tested by the manufacturer for their resistance to external pressure. Generally, a DN300 polyethylene pipe made from 100% new material can handle a negative pressure of 0.3MPa without any problems (I have conducted such tests myself), and for distances of 100 meters, there is no need to consider compensation issues for polyethylene pipes
Okay, thank you. Following your recommendation, I will search for more information and details first, and then go for a consultation. {:1_90:}