An anchor flange is used to prevent axial movement in pipelines caused by liquid flow and temperature changes. It is commonly anchored to a concrete foundation and placed at turns or bridge crossings. It can also be used in smaller hydraulic hardlines and is secured by bolting to machines or buildings. The flange is typically welded onto the pipe and sealed with poured concrete.
An anchor flange is a device installed on a pipeline to combat axial movement. Similar to a collar, once attached to a pipe, the anchor flange is commonly anchored to a concrete foundation. Typically placed over a section of pipeline as it makes a turn or at a bridge crossing, the anchor flange is used to prevent the pipeline from shifting.
One of the common traits of a metal pipeline is its inherent movement caused by the flow of liquid through the pipe, as well as expansion and contraction caused by temperature changes. When a pipe makes a sharp turn, the flow of liquid inside the pipe tries to push the pipe in the direction of the flow. By placing an anchor flange on the pipeline and securing it in place by clamping it into a concrete pillar buried deep in the ground, the forces pushing against the pipe are transferred into the ground.
Another area where an anchor flange is commonly used in a pipeline is at river crossings and bridges. If left unanchored, a pipeline has a tendency to give way when crossing large expanses. This is caused by the weight of the liquid flowing through the pipeline. By placing an anchor flange on each side of the junction, the pipeline is held securely in place and movement is prevented. The friction of the fluid moving through the pipeline will attempt to push the pipeline out of position over time, if not for an anchor.
The same aspects of motion in a large pipeline are duplicated in the smaller versions of the hydraulic hardline. When the hydraulic fluid is heated, the hydraulic hardline begins to expand and contract. When anchoring a plumbing line to a car or machine shop, it is not possible to place an anchor flange in concrete. The anchor used in this type of application is commonly secured by bolting the anchor to the machine or building. This requires a flange that looks like a bearing block, with a bolt hole drilled in each corner of the anchor block.
The most common method of attaching a flange to a pipe or plumbing line is to tightly weld the flange in place. This allows the installer to precisely position the flange on the pipe where it will offer the most success. When sealing the concrete anchor flange, concrete is usually poured around the flange and pipeline after the flange has been welded onto the pipeline.
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