To prevent mechanical damage caused by improper external force, it is crucial to protect the 1PP-R pipe during handling and construction. Unlike metal pipe, it possesses lower hardness and poorer rigidity. After the dark application, it is advisable to mark the location of the pipeline to avoid any damage during the second decoration phase.
When working with 2PP-R pipe, it's essential to watch out for its low temperature brittleness that sets in below 5 ℃. Be extra cautious during winter construction and handle the pipe carefully. When cutting, be sure to use a sharp knife and make slow, deliberate cuts. Avoid pressing or knocking on the installed pipeline, and remember to cover any parts that are vulnerable to external force with protective measures as necessary. By being diligent with these precautions, you can ensure the safe and successful installation of your 2PP-R pipes.
When 3PP-R pipes are subjected to prolonged exposure to ultraviolet rays, they tend to age and deteriorate, making it necessary to wrap them in a dark protective layer when installed in outdoor areas or direct sunlight. It is important to note that without proper protection, these pipes are susceptible to damage and can compromise the integrity of the system they are being used in. Therefore, taking precautions and ensuring that these pipes are properly protected is crucial in maintaining safe and efficient operations.
To prevent any leakage points, it is recommended to use hot-melt connection when connecting 4PP-R pipes, except when connecting with metal pipes or water appliances. In these cases, it is advisable to use mechanical connection methods like threaded inserts. It is essential to ensure that all pipes are integrated to form a seamless and secure connection. This will prevent any potential leaks and ensure the longevity of the piping system.
In order to prevent expansion and deformation of 5PP-R pipes, it is necessary to take technical measures during installation when they are used on surfaces or are not directly buried. This is due to the fact that the linear expansion coefficient of these pipes is relatively large at 0.15mm/m°C. By being mindful of this, proper precautions can be taken to ensure optimal functioning of the pipes.
Before sealing the pipeline and covering it with a decorative layer, it is essential to conduct pressure testing to ensure there are no leaks. This testing process is crucial for both direct burial and non-direct burial pipelines. Once the pipeline has been installed, it is essential to assess whether the system can withstand pressure. Only then should the sealing and covering process be initiated. This ensures the integrity of the pipeline, preventing potential hazards in the future.
The minimum pressure required for cold water pipes during the pressure test is 0.6MPa, which is also 1.5 times the working pressure of the system. This ensures that the pipes are durable and can withstand the pressure fluctuations during normal operation.
The working pressure of the hot water pipe should not be less than 1.5MPa, while the test pressure should be double that.
Technical regulations for pressure tests include specifications on the time and method of conducting the test. It is important to adhere to these regulations in order to ensure the accuracy and safety of the pressure testing process. The time for a pressure test refers to the duration for which the test is to be conducted. This can vary depending on the specific requirements and industry standards. The method of conducting the pressure test involves the procedures and techniques employed to measure and assess the pressure within a system or component. These methods may include using specialized equipment, such as pressure gauges or transducers, and following specific protocols to ensure accurate and reliable results. Adhering to the technical regulations for pressure tests is crucial for maintaining the integrity and performance of the tested systems or components and for ensuring the safety of personnel involved in the testing process.
According to the regulations, when the PP-R pipe is laid openly or not directly buried, it is necessary to install the support and hanger.