Prefabricated high-pressure chemical pipeline fittings for power plant pressure vessels

Characteristic
Standardized production: Prefabricated pipelines are usually produced according to unified standards and specifications, ensuring consistency in pipeline size, material, and connection methods, which is beneficial for improving the installation quality and reliability of pipeline systems.
High precision: Manufacturing in a factory environment, advanced production equipment and processes can be used to ensure the processing accuracy of pipelines, reduce errors and adjustment work during on-site installation.
Strict quality control: The production process is subject to strict quality monitoring, with corresponding quality inspection measures in every link from raw material inspection to production technology, which helps to timely detect and correct quality problems, ensuring that product quality meets relevant standards and requirements.
High production efficiency: Factory production can achieve large-scale and specialized production, and can simultaneously process and manufacture multiple pipelines, greatly improving production efficiency and shortening project construction cycles.

Advantage
Shortening the construction period: As the prefabricated pipes have already completed most of the production work in the factory, only simple installation and connection are needed on site. Compared with the traditional on-site pipeline production method, it greatly reduces the on-site construction time and effectively shortens the entire project duration.
Cost reduction: On the one hand, the large-scale production of prefabricated pipelines can reduce unit costs; On the other hand, it reduces on-site construction time and labor costs, while also reducing material waste and quality problem repair costs that may arise due to limitations in on-site construction conditions.
Improving safety: The factory production environment is relatively stable, with complete safety facilities, which can better ensure the safety of workers. At the same time, it reduces the time and frequency of dangerous operations such as high-altitude work and hot work on site, and lowers the safety risks of the construction site.
Quality assurance: As mentioned earlier, prefabricated pipelines undergo strict quality control during the production process, ensuring their quality. Compared to on-site production, prefabricated pipes are less affected by factors such as weather and environment, which can better ensure the performance and service life of the pipes.

Application area
Building water supply and drainage system: including domestic cold water and hot water supply systems, as well as sewage and wastewater discharge systems inside the building. The use of prefabricated pipelines can improve the installation efficiency and quality of water supply and drainage systems, ensuring the normal operation of the system.
HVAC system: Prefabricated pipes have also been widely used in air conditioning chilled water, cooling water systems, and ventilation duct systems. It can meet the requirements of the system for pipeline insulation, sealing and other performance, while improving the installation accuracy and operational efficiency of the system.
Industrial pipeline systems: Process pipeline systems in industries such as petroleum, chemical, and power have strict requirements for pipeline material, pressure rating, and corrosion resistance. Prefabricated pipelines can be customized for different industrial needs to ensure the safe and reliable operation of the pipeline system.

Installation points
On site measurement and verification: Before installing prefabricated pipelines, precise measurements must be taken at the construction site to ensure that the size and direction of the prefabricated pipelines match the actual installation position. At the same time, it is necessary to verify whether the specifications, models, and quantities of prefabricated pipelines are consistent with the design requirements.
Pipeline transportation and storage: Precast pipelines should be protected during transportation to avoid collisions and damage. After arriving at the construction site, it should be stored according to the prescribed requirements to prevent pipeline deformation, moisture, etc.
Installation sequence and method: Determine the installation sequence of prefabricated pipelines based on the design drawings and construction plan. Generally, the main pipeline is installed first, followed by the branch pipeline and ancillary equipment. When installing, pay attention to the connection method of the pipeline to ensure a firm connection and good sealing.
Quality inspection and acceptance: After the installation of prefabricated pipelines is completed, a comprehensive quality inspection and acceptance should be carried out. Check the slope, verticality, and sealing of the connection parts of the pipeline to ensure that the pipeline system meets the design and construction quality standards.

Installation precautions
Basic inspection and acceptance: Before installing prefabricated pipelines, strict inspection and acceptance of the pipeline foundation must be carried out to ensure that the flatness, elevation, and bearing capacity of the foundation meet the design requirements, in order to prevent stress concentration and deformation of the pipeline due to uneven settlement of the foundation.
Pipeline hoisting and positioning: Due to the large volume and heavy weight of prefabricated pipelines in power plants, professional hoisting equipment and correct hoisting methods need to be used during the hoisting process to ensure that the pipelines are smoothly and accurately positioned. At the same time, attention should be paid to protecting the insulation and anti-corrosion layers of the pipeline to avoid damage during lifting.
Pipeline connection and sealing: Pipeline connection is a key link in prefabricated pipeline installation, and common connection methods include welding, flange connection, etc. For welding connections, qualified welders must operate according to the welding process specifications and undergo non-destructive testing to ensure welding quality. For flange connections, attention should be paid to the selection and installation of gaskets to ensure the sealing of the connection area.
Installation of support and hanger: The function of support and hanger is to support and fix the pipeline, ensuring the stability and safety of the pipeline during operation. The installation position, spacing, and form of supports and hangers should meet the design requirements, and spring supports and hangers or sliding supports and hangers should be reasonably set according to the thermal expansion of the pipeline to absorb the thermal displacement of the pipeline.
System debugging and inspection: After the installation of prefabricated pipelines is completed, system debugging and inspection work should be carried out. This includes blowing, flushing, water pressure testing or air pressure testing of pipelines to remove debris and inspect the tightness of pipelines. At the same time, it is necessary to monitor and adjust the thermal expansion, displacement, etc. of the pipeline system to ensure that it can work normally during operation.