The installation of pressure pipeline has an important impact on personnel safety and industrial production. Once the problems of pressure pipeline occur, it is likely to lead to the loss of property and life. Therefore, it is very important to improve the quality of pressure pipeline installation projects. This paper analyzes the particularity of pressure pipeline installation and the key points of quality control of pressure pipeline installation project, hoping to provide some reference.

Key words: installation; Pressure; Pipeline; Engineering; quality

First, the particularity of pressure pipeline installation

The whole process of pressure pipeline installation is relatively complicated and has great particularity, which brings great difficulty to its installation quality control.

First of all, most of the pressure pipeline installation construction environment is bad. Usually, the installation environment of pressure pipeline is outdoors, which is greatly affected by the change of external environment. For example, in the case of high temperature or low temperature weather environment, the construction personnel have to carry out construction in the harsh environment such as hot and cold. In addition, the construction personnel in the chemical plant also need to face the atmospheric corrosion environment and closed space for operation, which requires the construction personnel to do a good job of safety protection and monitoring work, to avoid causing safety accidents.

Secondly, the pressure pipeline installation and construction requirements are strict. General pressure pipeline construction has detailed technical requirements, construction personnel must be in strict accordance with the construction drawings and construction plans to avoid quality problems caused by construction mistakes. In the process of pressure pipeline installation, construction personnel need to install pressure pipelines of various media. However, most pressure pipeline construction in chemical plants has small space, more equipment and limited operation scope, which greatly increases the difficulty of pressure pipeline construction.

Thirdly, the pressure pipeline installation project is greatly affected by objective conditions. The construction of pressure pipeline installation project usually needs to be completed in one go. The construction personnel need to complete all the installation work of pressure pipeline in accordance with the corresponding construction period and ensure the construction quality of pressure pipeline. However, the construction process of pressure pipeline is relatively strict, so it is difficult for the construction unit to start from the aspect of process shortening. Thus, the quality of pressure pipeline installation project is adversely affected.

Two, pressure pipeline installation engineering project quality control implementation points

(I) Quality control of pressure pipeline construction technology

The construction technology of pressure pipeline is an important guarantee for the quality of pressure pipeline installation project. Only by ensuring that the technology used in each link of construction meets the specific quality standards can the construction quality be guaranteed. In terms of technical control of construction quality, relevant construction personnel can carry out scientific control according to different construction projects.

1. Installation and control of combined pressure pipeline

The installation of combination pipeline is a common situation of pressure pipeline. The construction personnel must properly lift and firm the combination pipeline according to the rigidity of the pipeline to avoid the deformation of the pipeline. In the quality control of each part of the combined pipeline, the construction personnel need to remove the paint and rust within 12.5mm of the inner and outer walls of the groove of the pipe and pipe fitting, and the cleaning work can be stopped until the luster of the metal appears. For the groove with a wall thickness of more than 20mm, it is necessary to carefully check whether there are cracks, interlayers and other problems in the groove. The construction personnel should ensure that the pipe is flat and straight. The welding Angle deformation must be 200mm away from the interface center.

2. Welding of pressure pipeline is an important link in the installation of pressure pipeline, and its welding quality has a great impact on the installation quality of pressure pipeline

In terms of welding technology control, relevant construction personnel should strictly follow the relevant design drawings, construction standards and welding process evaluation. And before welding need to do a good job of material acceptance work, only to ensure the quality of pipes, pipe fittings, welding materials is the first step to ensure the quality of welding, followed by the verification of the effective certificate of welding operators, a qualified welding operators can greatly improve the quality of pipeline welding. After the welding, the weld should be tested and the strength of the pipeline system should be tested to ensure the welding quality of the pressure pipeline.

3. Support and hanger installation technology control

Support hanger is one of the important components of pressure pipeline installation, improving its quality can promote the overall quality of pressure pipeline construction. The relevant construction personnel shall install the support hanger in strict accordance with the specific design of the corresponding construction drawings, and strictly control the fit of the required nuts during the installation process to ensure the integrity of the nut threads and ensure the construction quality of the support hanger from a fine point. Construction personnel should pay particular attention to the control of the cleanliness and smoothness of the sliding surface between the sliding bracket and the guide bracket in construction, to ensure that the ball, roller and other moving parts have good contact with the supporting parts, to ensure that the pipeline can expand within a certain range, to avoid pipeline explosion, cracks and other problems due to poor expansion of the pipeline.

(II) Process quality control

In the construction process of pressure pipeline installation project, relevant construction enterprises need to strictly control the construction procedure of pressure pipeline to ensure that the whole installation and construction of pressure pipeline can be carried out in strict accordance with the corresponding process plan and ensure the quality of pressure pipeline installation project. Relevant construction enterprises need to formulate corresponding pressure pipeline construction process plan according to the specific situation of pressure pipeline engineering, and use various process inspection means to check the established pressure pipeline installation and construction process plan to ensure the quality of construction process.

1. Technical disclosure work

The specific arrangement of pipeline installation procedure is closely related to the construction technology selected by the construction enterprise. Therefore, the construction enterprise needs to organize technical personnel, designers and construction management personnel to carry out technical disclosure according to the specific situation of the pressure pipeline installation project before the process arrangement, so as to comprehensively consider all factors of the project and formulate a scientific construction procedure plan.

2. Pipeline prediction work

The pipeline installation process has a great relationship with the pipeline itself. Usually, the size and material of the pipeline will have a certain impact on the process, so the relevant construction personnel need to carry out the pipeline prediction work before construction. The construction personnel survey the pipeline construction site according to the single line diagram of the pipeline to determine the size, material, and specification of the required pipeline. After determining the specific parameters of the required pressure pipeline, arrange them according to the material and pipe number for convenient statistics and planning.

3. Control the process of technological construction

Relevant construction personnel shall strictly control the whole process of pressure pipeline installation and construction, conduct quality inspection of pipelines within the construction area in strict accordance with the corresponding quality inspection standards, and record the test results to provide corresponding data support for the adjustment of quality control strategy in the later period.

Iii. Concluding Remarks

Most of the pressure pipeline media are toxic and harmful, flammable and explosive or high temperature and low temperature, so the quality control of pressure pipeline is important. Construction enterprises can effectively improve construction quality, ensure normal use of pressure pipeline and avoid safety accidents through quality control of pressure pipeline installation projects. In the process of pressure pipeline installation and construction, construction enterprises can comprehensively improve the quality control effect of pressure pipeline construction and ensure the quality of pipeline installation from the aspects of material quality control, personnel qualification control, construction technology quality control and process quality control.