Elbows in two-phase flow pipelines
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This post was last edited by Little Worker on 2017-8-8 at 15:52. We know that water hammer phenomena often occur in two-phase flow pipelines, and the areas near elbows are particularly prone to damage. So, can an elbow be replaced with a tee together with a plug, as shown in Figure 2? In other words, should the end of the branch pipe be equipped with a pipe cap and a tee instead of an elbow? I’ve seen many cases where elbows could have been used, but instead tees with flange covers are employed, as shown in the diagram. I also want to understand why vertical pipes are required for the branching of gas-liquid two-phase flow; I’m hoping to get a specific theoretical explanation for this.
Since the plug area becomes a dead corner, could freezing occur there or be it prone to corrosion?
It increases investment costs, and the three-way connections are also subject to erosion
I mean, will the stress on a tee be greater than that on an elbow? Won’t it be damaged as easily by water hammer?
It is all to achieve flow pattern stability and uniform fluid distribution
What is the principle behind why two-phase flow is susceptible to water hammer? In my understanding, the gas phase in two-phase flow can absorb some of the impact energy, which is why water hammer doesn’t occur as easily
Personally, I think that compared to tees, elbows have a smaller energy loss due to the curved transition; whereas the turning points of tees are at 90-degree angles, so I believe it is more reasonable to use elbows.
Long-radius elbows can be used, 3 or 6DN
It emphasizes symmetrical arrangement, which is effective in eliminating vibrations in two-phase flow conditions
OP, what kind of material is this?
Personally, it is recommended to use buffer tanks at turns instead of elbows; when arranging the pipelines, effort should be made to ensure that the buffer tanks are filled with liquid.