Pipelines are constructed in such a way that allows them to maintain a certain shape and profile under specific conditions. However, ground movements, heavy loads, incorrect installation, corrosion, and other factors can lead to a pipe ovalization or sagging. While such deformations may seem barely noticeable, they can severely impact the performance of a pipeline, leading to increased maintenance costs and reduced service life of the asset.
This article will discuss pipe rerounding and pipe sags repair, as well as the importance of addressing such issues in a timely manner.
Overview
Generally, pipe rerounding refers to restoring a pipe’s round profile. Pipes that have lost their circular shape or ovalization require rerounding so that they can provide free movement of liquids or gases within them. It follows that rerounding is crucial for water, sewage, stormwater, gas, and other pipelines.
The process of rerounding usually involves specialized equipment, the choice of which depends on the pipeline’s material, size, and other factors. In most cases, rerounding is a less invasive and more cost-effective solution than replacing a whole pipeline.
Pipe sags are also referred to as bellies or low spots. They occur when a portion of the pipeline sags below the plane of the centerline of the pipe. Sagging is a common phenomenon for many pipelines, usually due to the accumulation of liquids and/or solids in the low spot. Such local deformations can lead to frequent clogging of the pipeline. In addition, pipe sags can lead to unpleasant odors from the accumulated liquid and the retention of unwanted materials within the pipeline. Moreover, low spots can cause stress concentrations in a pressured pipeline, leading to the rupture of the pipe walls.
There are various reasons why pipes tend to ovalize or sag. In most cases, such deformations are caused by human error during installation. For instance, pipelines laid on an uneven surface will tend to deform under the force of traffic. Ground movements can also cause local deformations of the pipeline if the laying was incorrect or the soil was not properly prepared. In addition, thermal stresses, freezing, earthquakes, and other events can affect the profile of the pipeline. Ovalization can also be caused by the fact that the wall of the pipe is not strong enough, which can be due to corrosion or a low-quality manufacturing process.
There are several signs that can indicate that a pipeline may require rerounding. Most often, such changes occur gradually, which is why regular inspections are so important. The most common signs of pipe deformation are slow drain flow, frequent blockages, and the presence of water in the pipeline. In addition, visual inspection can reveal local low spots or sagging. A change in the diameter of the pipeline is also a sign that should prompt action. Another telltale sign of a problem is the presence of cracks, broken seals, and an increased need for maintenance.
Modern video pipeline inspection technologies allow one to detect deformations and other issues with the profile of the pipeline. In this way, engineers can determine the most appropriate method of eliminating the detected problems.
The Process of Pipe Rerounding
It is worth noting that pipe rerounding is a specialized procedure that must be carried out by professionals. Usually, it begins with an inspection to identify the location of the deformation and assess its severity. Having obtained all the necessary information about the problem, specialists conduct rerounding using specialized equipment that gently restores the round profile of the pipeline without damaging its structural integrity. The time required for this type of work varies greatly depending on the technology used but rarely exceeds several days. A variety of mechanical, hydraulic, and pipeline rehabilitation equipment can be used during rerounding. After the procedure, a re-inspection of the pipeline is necessary to check whether the diameter is adequate.
In addition, rerounding can sometimes be combined with other methods of pipeline renovation. This is especially important when the integrity of the pipeline has been compromised.
The Methods for Correcting Pipe Sags
The choice of the method for correcting pipe sags depends on various factors, such as the cause of the deformation, the slope of the pipeline, the material of the pipe, and its integrity. Local low spots that have not deformed the pipeline integrity can be eliminated with special equipment. This technology gently lifts the pipeline to the desired position.
For more severe cases, more complex methods are used, such as excavating the pipeline and renewing the bedding, repairing the damaged site, or other methods. For deep depressions with significant deformations, a combination of available technologies is used. In addition, the choice of technology also depends on how much time and effort is available for repairs and whether it is possible to use certain types of equipment. Another important aspect is the availability of the site and the possibility of conducting works without damaging the surrounding structures. It is also vital to understand that each method has advantages and disadvantages. In most cases, it is best to fix both the symptoms and the cause of the problem.
The Benefits of Early Intervention
Timely intervention in the case of sagging or ovalization of pipes brings a number of benefits. For example, elimination of such local deformations reduces the risk of blockages within the pipeline. In addition, timely elimination of local bending reduces the load on the pipeline and extends its service life. Another advantage of early intervention is the prevention of local failures due to stress concentration. This, in turn, reduces the costs and downtime due to repairs and helps maintain the integrity of the entire structure.
The Importance of Professional Assessment
In each case, a professional assessment is crucial because the available technologies differ significantly in the required equipment, procedures, and time costs. Engineers will select the optimal solution taking into account the results of the video inspection of the pipeline, the material of the pipeline, and other factors. At the same time, failure to take timely action can lead to costly repairs and prolonged downtime. In addition, improper intervention can lead to additional problems and complications.
Preventing Future Pipe Problems
It is always better to prevent problems rather than deal with their consequences. Regular maintenance and timely interventions allow one to eliminate many issues before they occur or while they are still easy to address. This, in turn, reduces the costs and time required for repairs. Following the best practices when maintaining and repairing existing pipelines is also crucial. Finally, creating an efficient asset management plan for the pipeline will help develop the most cost-effective strategy for its maintenance and repair schedule.
Final Thoughts
In conclusion, pipelines are vital infrastructures in many systems, so it is crucial to ensure that they function properly. Ground movements, incorrect installation, corrosion, and many other factors can lead to local deformations of pipes, such as ovalization or sagging. Fortunately, most of these issues can be addressed using modern technologies. Moreover, timely intervention reduces the costs and complexities of repairs and ensures the free movement of liquids or gases within the pipeline. A professional assessment is always vital since it determines what steps to take in each case. The method of pipe rerounding is selected taking into account the severity of local deformations as well as the material of the pipeline and other factors.
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