Broken shaft of mechanical pump
Thread Content
One of our company’s gasoline pumps has a rated flow rate of 12 m3, but its actual flow rate is only 3–5 m3; moreover, the pump shaft often breaks. When we consulted the manufacturer, they said there was no problem with the pump shaft. Below are the pictures of the fracture.
The pump may be under vacuum; the flow rate is too low
Did it happen because excessive stress was applied in an area where it wasn’t allowed?
A flow rate that deviates too much from the rated value can cause excessive radial forces, leading to shaft failure due to fatigue
Check the installation of the check valves at the pump’s inlet and outlet, as well as the inlet filter.
Adding a return line at the pump outlet would be better
If cavitation is severe, such problems can occur. In our facility, a 150mm shaft experienced vibration due to severe cavitation, which led to shaft breakage and bearing damage.