2. PP-R pipe should not be placed in sunlight for a long time, subject to the sun and rain;
3. Due to the low temperature brittleness of the PP-R pipe, the ambient temperature at the construction site should be above 3°C when installing the pipeline. It should not be constructed below 3°C;
4. Pipes should be avoided as far as possible to avoid unnecessary attacks. They should be handled with care in construction. If the pipes are found to be blunt or cracked by non-normal forces before installation, construction should be stopped.
5. During the installation process, attention should be paid to temporarily blocking the nozzle, minimizing the entry of sediment into the pipeline and preventing the pipeline from plugging; the pipeline must also be flushed after installation.
6. The PP-R water supply pipe riser shall not be less than 400mm from the side of the stove, and the net distance from the heating pipe shall not be less than 200mm.
7. The water supply riser of Mingfu should be placed in the pipeline well in combination with the building layout. If there is no pipeline well, it should be as close as possible to the corner, wall or pillar of the sanitary appliance with large water consumption.
8. The water supply pipeline of Mingfu shall not pass through bedrooms, power distribution rooms, storage rooms, and flue gas ducts.
9. When PP-R water supply pipeline and other pipelines are laid in parallel with the same ditch (frame), it should be arranged along the ditch (frame) edge;
10. The PP-R piping system should be prevented from contact with paint, asphalt, and chemical solvents during installation.
11. When hot melt is connected, the maximum deviation angle of pipe and fittings shall not exceed 5o.
12. After the pipe is welded, it is strictly forbidden to twist it before it is completely cooled, otherwise there is a risk of water leakage at the welded joint.
13. During the pressure test of the pipe, the pressure should be gradually increased, and finally it should be stable. The alternating pressure cannot be applied to the pipe, otherwise the pipe is easily broken (especially at low temperature).
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