Flexible design of pipe galleries
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I would like to ask how to arrange natural compensation and restraint points in the main corridor of a steam pipeline system
Roads in general factory areas are equipped with gantries, which constitutes the best natural compensation.
The type of gantry used means that the steam pipes cannot meet the stress requirements; at least vertical square compensators are needed
It depends on factors such as design conditions (temperature, dimensions, orientation, and length), the desired controlled thermal displacement length (which is related to the length of the pipe shoe and the clearance between it and adjacent pipes), stress amplitude (the greater the length of the pipe between the fixing points, the higher the stress level), and the width of the pipe tray (which directly determines the length that can be designed for the short arm and its corresponding absorption capacity).
If a π-shaped bend is not sufficient, a three-dimensional π-shaped bend can be used, namely the so-called Cuban bend. Generally, a fixed support is installed between the two gantries. Force balance on both sides – the resultant force on the fixed support is minimized. If your pipeline is not that long, the handling can be simplified.
May I ask how the size of a π-shaped bend is determined, and how long is the pipeline that typically requires a π-shaped bend?
The size of the dragon gate determines the size of the curved sections. The road is laid out over a distance of about 100 to 200 meters.
There are parameters that can help you estimate one. The specific approach is to first determine the temperature based on the length of the short arm, calculate the amount of compensation required using the pipe diameter, and then verify it using a machine.
The width of the pipe gallery is 3m, the design temperature is 470 degrees, it’s DN200, the pipes run from north to south, and the length of the pipes is 70m; the displacement is to be kept within 100 MM. Are these conditions acceptable?
Based on the thermal expansion coefficient assumed for chromium-molybdenum steel, which is around 35 M, one unit can meet the requirement of a one-sided displacement of 100 MM. If it’s stainless steel, it should be made around 24M in thickness. The temperature here is not low, so the thermal displacement is also greater.