The installation of pressure pipelines has significant impacts on personnel safety and industrial production. If there are problems with the pressure pipelines, it is very likely to result in property and life losses. Therefore, it is extremely important to improve the quality of pressure pipeline installation projects. This article analyzes the uniqueness of pressure pipeline installation and the key points of implementing quality control for pressure pipeline installation projects, hoping to provide some reference value. Key words: Installation; Pressure; Pipeline; Engineering QualityI. The Special Nature of Pressure Pipeline Installation The entire process of pressure pipeline installation is relatively complex and has significant uniqueness, which brings considerable difficulties to the quality control of the installation. Firstly, the installation of pressure pipelines is mostly carried out in harsh construction environments. Usually, the installation environment of pressure pipelines is outdoors and is greatly affected by external environmental changes. For instance, in hot or cold weather conditions, construction workers have to work under harsh conditions such as heat and cold. Additionally, construction workers in chemical plants also need to operate in an atmosphere-corrosive environment and enclosed spaces. This requires proper safety protection and supervision for the construction workers to prevent safety accidents. Secondly, the installation of pressure pipelines has very strict requirements. Generally, there are detailed technical specifications for pressure pipeline construction. Construction personnel must strictly follow the construction drawings and plans for the construction process to avoid quality problems in pressure pipelines due to construction errors. During the installation of pressure pipelines, construction personnel need to carry out various pressure pipeline installation work with various media. The construction of pressure pipelines in chemical plants is mostly in small spaces with many equipment, and the operation range is limited, which greatly increases the difficulty of pressure pipeline construction. Again, the installation of pressure pipelines is greatly influenced by objective conditions. In the construction of pressure pipeline installation projects, it is often necessary to complete the entire process in one go. The construction personnel need to follow the corresponding construction schedule and ensure the quality of pressure pipeline construction while completing all the installation work. The construction procedures for pressure pipelines are relatively strict, and construction units find it difficult to reduce the procedures from this aspect. In order to complete the project on schedule, some construction enterprises will relax the supervision of quality control, which will subsequently have an adverse impact on the quality of pressure pipeline installation. II. Key Points for Quality Control in Pressure Pipeline Installation Project Construction (1) Quality Control of Pressure Pipeline Construction Technology Pressure pipeline construction technology is an important guarantee for the quality of pressure pipeline installation projects. Only when relevant technicians ensure that the technologies used in each construction link comply with specific quality standards requirements, can the construction quality be guaranteed. In terms of technical control of construction quality, relevant construction personnel can conduct scientific control according to different construction projects. Installation control of combined pressure pipelines The installation of combined pipelines is a common situation in pressure pipeline construction. During the installation of combined pipelines, construction workers must appropriately perform lifting and fixation based on the rigidity of the pipelines to avoid pipeline deformation. In terms of quality control of each part of the combined pipelines, construction workers need to remove the paint and rust on the inner and outer walls of the pipe and pipe fittings within 12.5mm. The cleaning work can stop when the metal surface becomes shiny. For the bevels with a wall thickness of more than 20mm, construction workers need to carefully check whether there are cracks, voids, or other problems. During the construction, construction workers must ensure that the pipe joints are straight and that the welding angle deformation is within 200mm away from the interface center. 2. Pressure pipeline welding is an important part of pressure pipeline installation. The welding quality has a significant impact on the overall quality of pressure pipeline installation. In terms of welding technology control, the relevant construction personnel need to strictly follow the relevant design drawings, construction standards, and welding process assessment during the construction process. Before welding, material acceptance work needs to be done well. Only by ensuring the quality of pipes, pipe fittings, and welding materials can the first step of guaranteeing welding quality be achieved. Secondly, the valid certificates of welding operation personnel need to be checked. A qualified welding operation personnel can significantly improve the welding quality of the pipeline. After the welding is completed, corresponding non-destructive testing of the weld seams and strength tests of the pipeline system should be carried out to ensure the welding quality of pressure pipelines. 3. Control of Installation Technology for Supports and Hangers Support and hanger devices are one of the important components in the installation of pressure pipelines. Improving their quality can enhance the overall quality of pressure pipeline construction. Relevant construction personnel need to install them strictly according to the specific design of the corresponding support and hanger devices in the construction drawings, and strictly control the compatibility of the required nuts during the installation process. They must ensure that the nut threads are intact, and ensure the construction quality of the support and hanger devices from the details. During the construction, construction personnel should particularly pay attention to the cleanliness and flatness of the sliding surface between the sliding support and the guiding support, and ensure that the rolling balls, rollers and other moving parts have good contact with the supporting components, so that the pipeline can expand within a certain range and avoid problems such as pipeline explosion or cracking caused by insufficient expansion later. (2) Process Quality Control During the construction of pressure pipeline installation projects, relevant construction enterprises need to strictly control the construction procedures of pressure pipelines to ensure that the entire pressure pipeline installation project can be carried out in accordance with the corresponding process plan, and to guarantee the quality of pressure pipeline installation. Relevant construction enterprises need to formulate corresponding pressure pipeline construction process plans based on the specific circumstances of the pressure pipeline project, and use various process inspection methods to inspect the formulated pressure pipeline installation construction process plans to ensure the quality of the construction procedures. Technical briefing work The specific arrangement of pipeline installation procedures is closely related to the construction techniques chosen by the construction enterprise. Therefore, the construction enterprise needs to organize technicians, designers, and construction managers to conduct technical briefings regarding the specific pressure pipeline installation project before the procedure arrangement. This is to comprehensively consider various factors of the project and formulate a scientific construction procedure plan. 2. Pipeline prediction work The pipeline installation process is closely related to the pipeline itself. Usually, the size, material, etc. of the pipeline will have certain impacts on the process. Therefore, the relevant construction personnel need to conduct pipeline prediction work before the construction. The construction personnel conduct surveys of the pipeline construction site according to the single-line diagram of the pipeline, to determine the required pipeline size, material, specification, etc. After determining the specific parameters of the pressure pipeline required, they place them in categories according to the material and pipe number, which is convenient for statistics and planning. 3. Control of the construction process of the project The relevant construction personnel need to strictly control the entire process of pressure pipeline installation. They should conduct quality inspections on the pipelines within the construction area in accordance with the corresponding quality inspection standards, and record the inspection results. These records will provide data support for the adjustment of subsequent quality control strategies. III. Conclusion The media in pressure pipelines are mostly toxic, harmful, flammable, explosive, or subject to high or low temperatures. Therefore, the quality control of pressure pipelines is of great significance. Construction enterprises can effectively improve the construction quality by conducting quality control over pressure pipeline installation projects, ensuring the normal use of pressure pipelines and avoiding safety accidents. During the installation of pressure pipelines, construction enterprises can start from aspects such as material quality control of pressure pipelines, personnel qualification control, construction technology quality control, and process quality control, to comprehensively enhance the quality control effect of pressure pipeline construction and ensure the installation quality of the pipelines.