Why are pipe bends always connected smoothly using elbows instead of right-angle bends?
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Why are pipe bends always connected smoothly using elbows instead of right-angle bends? Due to space constraints, several of our φ600mm duct elbows will have to be modified to use right-angle connections or have a very small radius of curvature. What effects will this have?
For straight pipes, the material can be considered uniform, without any abrupt changes, and there is no stress concentration. If a sudden turn is made, the transition at that turn becomes discontinuous, resulting in a sudden increase in stress and concentration, which leads to the failure of the container at that turning point. The use of arcs is intended to soften such abrupt changes and achieve a smooth transition. For the normal operating conditions of normal temperature and pressure, without severe requirements, it is also possible to make a direct turn. Another aspect is the impact on the medium; for example, when a car turns, it doesn’t turn 90 degrees right away – it first moves along its original path before turning. The same is true for fluids: turning abruptly results in high energy loss and severe erosion at the corner.
You can find a road that’s straight and quite narrow, and try driving there.
The effect is an increase in pressure drop, which results in a lower outlet air pressure; it’s best to do some calculations. Moreover, for right angles, I’ve only seen square tubes; I’ve never seen round tubes with right-angle bends. Normally, we use 1.5D elbows in our designs. Since you are not an HVAC specialist, it’s best to consult a professional. I’ve never seen this approach used in such processes, and if it is for dust removal and ventilation, corners are prone to getting clogged
We also have right-angled bends here; if the pipeline is large, guide vanes are added
If the pressure is not high and it is used only for ventilation, a directly bent elbow designed by oneself can be used if the welding costs are appropriate
In the case of a right angle, the voltage drop will be greater.