Abstract
In recent years, the safe and stable operation of natural gas pipeline has become the focus of the whole society. Long distance natural gas pipelines are mostly large-diameter and high pressure pipelines, so their safe operation is particularly critical. In the high-pressure natural gas pipeline transportation industry, the wall thickness of key points (elbows and tees) will be thinned due to long-term erosion of gas, resulting in serious consequences. Therefore, its wall thickness monitoring is a key work of long-distance natural gas pipeline operation units. At present, most of them adopt off-line monitoring, but the standardized monitoring cycle cannot be effectively determined, and there are no relevant standards in the industry. The author uses fluent simulation software to establish the model, and then modifies the model combined with the field data. Then, the model is used to analyze the influencing factors of key points (elbow and TEE) one by one, and select more important influencing factors to formulate the monitoring cycle of different points. The monitoring cycle can provide reference for the daily work of on-site operators, and then ensure the safe and stable operation of long-distance natural gas pipeline.
Highlights
Pipeline wall thickness detection is common in oil and gas field gathering and transmission pipelines and natural gas pipelines with high water content
The results show that the particle velocity has an exponential relationship with the erosion rate; The increase of pipe diameter will reduce the
The results show that the greater the gathering pressure is, the less the erosion wear degree of elbow is; Gravity will affect the erosion wear degree and wear area of elbow; The smaller the gathering pipe diameter and the larger the particle diameter, the more serious the erosion wear [2]; Ji Chuling et al Simulated the erosion wear of smooth inner wall and three bionic inner wall bends: transverse groove, longitudinal groove and pit
Summary
Pipeline wall thickness detection is common in oil and gas field gathering and transmission pipelines and natural gas pipelines with high water content. The results show that under the same conditions, the wear resistance of the thickened elbow can be significantly improved by using the bionic surface, and the wear resistance of the thickened elbow with different surface morphology is in the order of transverse groove shape, longitudinal groove shape, pit shape and smooth shape from large to small [3]; Zheng Yunping and others used fluent to simulate the relationship between various influencing factors and the erosion position and degree of elbow, and came to the conclusion that gas erodes the inner wall of elbow in a large area, and metal chips erode locally in this area; According to the different erosion conditions of elbows at different angles, the protection idea of "fixed side, large area and emphasis" is put forward in terms of protection parts and effectiveness [4]; Hulin deeply studied the wear law and on-line monitoring of wall thickness of fluid transmission pipeline with high temperature, high pressure and high solid holdup. The monitoring cycle can provide reference for the daily work of on-site operators, and ensure the safe and stable operation of long-distance natural gas pipeline
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