The vertical difference of pipeline laying in the longitudinal direction is far greater than the pressure difference specified by the standard. Therefore, before the pressure test, we conducted a scientific and technical analysis of the impact of the pressure difference on the height difference to ensure the safety and smoothness of the pipeline pressure test . Analysis of the effect of large height difference on pipeline hydraulic pressure test Under the condition of general height difference, during the pipeline pressure test, the influence of the "Construction Specifications" on the elevation difference is negligible. If the height difference of the pipe section exceeds 30m, the impact on the pressure test will increase, and there are three specific performances:
(1) During the pressure test, the determination of the standard parameters of the test pressure measurement cannot be directly applied to the pressure value given by the designer, and the standard value of the strength test and the standard value of the tightness test should be corrected according to the position of the pressure gauge and the influence of the hydrostatic pressure;
(2) The hoop stress caused by the hydrostatic pressure caused by the elevation difference on the internal pressure of the pipeline can no longer be ignored. This is because, although the pressure test strength does not reach the yield strength of the pipeline material during the pressure test, the elevation difference At a certain value, the additional internal pressure generated by the hydrostatic pressure and the test pressure together may exceed the load-bearing capacity of the pipeline, causing excessive deformation or even damage to the pipeline. Therefore, the pipeline must be checked for strength under large height differences. ;
(3) Due to the increased elevation difference, the water injection pressure during pipeline pressure test and water injection is increased, and the volume of the gas barrier formed by the traditional direct injection method will be further increased, so that the difficulty of pipeline pressure test and water injection is increased. The analysis of the experimental pressure value has also become very tedious, and sometimes it is even impossible to analyze and judge whether the pressure test result is reasonable. In this way, new requirements are also placed on the selection of the pressure test pump and the choice of water injection method.
When the vertical height drop of the pipeline is large, the water supply of the pipeline pressure test needs to solve two main problems. First, the air content in the pipeline needs to be controlled within a reasonable range; second, the water injection system meets the water supply requirements . To effectively control the air content in the pressure test pipe section, a reasonable water injection method must be used. The traditional pipeline pressure test water injection adopts the method of direct injection and high point venting. This method easily forms air resistance in the pipe section. Especially in the case of a large vertical height difference in the pipeline, the air resistance phenomenon is more obvious. The amount of water is obviously smaller than the theoretically calculated amount of water. In this way, the analysis of the experimental pressure value becomes very cumbersome, sometimes even impossible to analyze. Therefore, in order to reduce the air resistance as much as possible, we use the water injection method of the water push ball in this section. When the water is injected, the water pushes the ball, and the ball pushes the front gas. The gas is discharged from the vent valve at the end of the pipeline, which is obtained by the water injection method.
In the construction of pipelines, it is a task with high technical requirements, especially in the case of a large difference in vertical elevation of the pipeline, the influence of the pressure of the water itself due to the height difference must not be ignored, especially in the internal force. The strength of the low point of the pipeline must be checked to ensure the safe pressure test of the pipeline. therefore,
(L) With the increase of large-scale construction projects and the continuous improvement of pipeline welding quality and efficiency requirements, pipeline prefabrication should attract sufficient attention from the construction unit, and determine the corresponding pipeline prefabrication mode according to the pipeline workload of the project.
(2) According to the actual situation of each unit, determine the establishment of "factory" or decentralized, centralized and decentralized "quasi-factory" pipeline prefabrication model.
Equip necessary and applicable pipeline prefabrication equipment.
(3) Pipeline rotating automatic welding machine should be selected for pipe welding.
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