why new pipes do not get damaged when steam flows through
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Water both entrained in steam flow and also as non-discharged condensate traveling at high speeds in piping is the source of most erosion. By repeatedly impacting piping at bends, the water can cause the gradual thinning of the pipe wall due to its mass and high velocity of impact, similar to what occurs in industrial water jet cutting. This type of erosion - caused by water droplets - is typically known as Liquid Droplet Impingement (LDI) Erosion.
In many cases, but particularly with carbon steel piping, erosion can remove the protective inner piping surface treatment thereby speeding the electrochemical thinning of the pipe wall, a process know as corrosion. In fact, both erosion and corrosion typically work together to cause the thinning of the steam pipe inner wall.
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