Could everyone help analyze the cause of corrosion?…
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This pipeline is a 22-kilogram steam pipeline, located at the elbow at the reboiler inlet.
The steam is cooled and depressurized, with a flow velocity of 15 meters per second.
It appears thinner on the inside, and it seems to have failed due to stress damage
Isn’t it steam erosion thinning–penetration?
There is a control valve on the steam line; the pressure before the valve is 20 and the pressure after it is 11.5. Could this be caused by steam carrying liquid due to a sudden drop in pressure?
Our device regularly measures the thickness of various pipes, with a focus on elbows. When repairing steam pipes, thick-walled elbows are chosen to account for erosion. It should be related to the pressure difference. It’s a pity I don’t have any statistical data
What is the nominal diameter of this elbow? What is the wall thickness? What material? 20# steel? It seems to me that this has nothing to do with corrosion.
It seems to be erosion caused by washing; if it’s stress, problems tend to occur more in the welds.