Let’s discuss and figure out the reasons for the damage to this impeller
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The damaged area is at the contact point between the stationary and rotating rings, where there is a groove. Impeller material: PTFE. Material: Phosphorus oxychloride, at room temperature.
However, there are no obvious signs of high temperature at the contact surface between the rotating and stationary rings
It runs idly without liquid for a short time only.
It’s probably not caused by corrosion; if the medium were corrosive, the impeller would also be corroded, and the signs of corrosion would be present on all areas in contact with the medium, rather than just in a circular pattern. Let’s analyze it from the perspective of mechanical seals (rotating parts) as well.
It ran idle, the temperature of the static ring of the mechanical seal increased, and it got damaged – is this explanation perfect?
The pump ran out of fluid and burned out due to idling for a short period of time
It shouldn’t be idling; there are no signs of charring. It may be due to damaged bushings, eccentric operation, or hard frictional wear