Installation steps of internal and external plastic coated spiral steel pipe for water supply in detail

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Installing internal and external plastic coated spiral steel pipe for water supply is a task that requires careful planning and precise execution. The following is a detailed step-by-step guide to help you successfully complete the installation.

I. Preparation: Make sure everything is ready

Before getting down to the business of installation, the first task is to carry out thorough preparatory work. This step is critical because it lays the foundation for the subsequent installation.

1. Check pipe sizes and quantities

Carefully check the internal and external plastic-coated spiral steel pipes for water supply delivered to the site to make sure that their specifications, models and quantities are exactly the same as those in the design drawings and the purchase list. Any discrepancy in specification or shortage in quantity should be resolved before installation to avoid delays in the construction process.

2. Check the quality of piping

Conduct a cosmetic inspection of each pipe for visible damage, deformation, or peeling of the coating. Ensure that the surface of the pipe is smooth and free of defects and the coating is intact. This not only concerns the service life of the pipes, but also directly affects the safety and reliability of the water supply system.

3. Prepare installation tools and equipment

Prepare all necessary installation tools and equipment in advance, such as pipe pliers, wrenches, welding equipment (if welded connections are used), sealing tapes, pipe supports, etc. Ensure that these tools and equipment are in good working condition so that they can be used smoothly during the installation process.

II. measurement and positioning: accurate planning of the installation path

Accurate measurement and positioning is to ensure the success of the installation of internal and external plastic-coated spiral steel pipe for water. This step needs to be based on the design drawings and the actual situation on site.

1. Measurement of installation position

According to the design drawings, use measuring tools (such as tape measure, level meter, etc.) to measure the installation position of the pipe accurately. Determine the starting point and end point of the pipeline as well as the locations of key nodes along the way to ensure that the pipeline direction meets the design requirements.

2. Determine the installation direction and location

Define the installation direction of the pipeline, usually from the water source to the water point direction. At the same time, determine the specific position of the pipeline at each node, including the relative position of the pipeline and buildings, other pipelines or equipment. For long-distance pipeline laying, need to be based on site conditions for reasonable segmentation, the length of each section should be easy to transport, handling and installation, but also take into account the thermal expansion and contraction of the pipeline and other factors, to reserve appropriate expansion and contraction space.

III. cleaning and processing: lay a good foundation for installation

Thorough cleaning and proper pretreatment are essential steps before pipe installation.

1. Clean the pipe surface

Use clean rags or brushes to clean the internal and external surfaces of the pipe to remove surface dirt and impurities such as dust, oil, rust and so on. Especially the connecting ends of the pipes should be cleaned thoroughly, because the cleanliness of these parts directly affects the sealing and reliability of the connection.

2. Anti-corrosion coating treatment

For the outer surface of the pipe, anti-corrosion coating is applied as needed. This step can further extend the service life of the pipe and prevent it from being damaged by corrosion in the external environment. If the pipeline has been coated with anti-corrosion coating at the factory, it is necessary to check whether the coating is intact, and if it is damaged, it should be repaired in time.

IV. connecting and fixing: to ensure the stability of the piping system

Connection and fixing of pipes is the core part of the installation process, which must be operated in strict accordance with the specifications to ensure the firmness and stability of the piping system.

1. Pipe connection

According to the design requirements and site conditions, choose the appropriate connection method. Common connection methods include threaded connection, flange connection, welded connection and so on. For threaded connection, make sure the threads are clean and intact, use suitable sealing tape or sealant to seal the connection, and then tighten the pipe with tools such as pipe pliers until the connection is firm and well sealed. For flange connection, check the flatness of the flanges and the cleanliness of the sealing surface, align the two flanges and then tighten the bolts evenly so that the flanges fit each other tightly to ensure that there is no leakage at the connection. Welding connections need to be operated by professional welders, and welding operations should be carried out in accordance with welding specifications to ensure the quality and strength of the welds.

2. Pipe fixing

After the pipeline connection is completed, you need to use special pipe brackets or hangers to fix the pipeline in a predetermined position. The spacing of the bracket or hanger should be determined according to the diameter of the pipe, material and installation location and other factors, in general, the spacing of the bracket should not be too large, in order to prevent the pipe from sagging or swinging due to the impact of self-weight or water flow. When fixing the pipeline, pay attention to the slope and direction of the pipeline to ensure smooth drainage and normal operation of the pipeline.

V. Pressure test: verify the sealing and bearing capacity of the piping system

After the installation is completed, the pressure test is a key step to ensure the safe use of internal and external plastic coated spiral steel pipe for water supply. This step can timely discover the possible problems in the piping system, such as water leakage, connection is not solid, etc., so as to take appropriate measures to repair.

1. Preparation before testing

Before the pressure test, you need to ensure that all the valves in the piping system are in a closed state, and at the same time, the end of the pipeline is blocked. Then, use the appropriate pressure pump or pressure source on the piping system for slow pressurization, pressurization speed should not be too fast, so as not to cause impact damage to the piping system.

2. Pressure test

According to the design requirements of the pressure value of the piping system for pressurization, usually the test pressure should be slightly higher than the normal working pressure of the pipeline. After reaching the test pressure, keep the pressure stable for a period of time (generally not less than 30 minutes), and carefully observe whether the piping system has water leakage, deformation or other abnormalities. If water leakage or other problems are found during the test, the pressurization should be stopped immediately, the problematic parts should be checked and repaired, and the pressure test should be repeated after the repair is completed until the piping system fully meets the requirements.

3. Record test results

After the pressure test is completed, detailed records should be made of the data during the test, including test pressure, holding time, leakage, etc. These records are not only useful for the inspection of the piping system, but also for the inspection of the piping system. These records not only provide a basis for acceptance of the piping system, but also provide important reference information for future maintenance and management.