Structure and installation of the new self-priming pump (images)
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Pump’s first-stage impeller, Pump’s second-stage impeller (turbine), Pump installation site (Pump inlet pipe: 80, Pump inlet diameter: 65, Pump outlet pipe: 80, Pump outlet diameter: 50)； An adjustable valve for regulating flow and pressure is installed on the outlet pipeline; when the valve is adjusted such that the outlet pressure exceeds 1.4 Mpa, a harsh noise begins to be heard in the pipeline, and the cause remains unknown. ）
1# Constant pressure: It can be seen from the images that the secondary turbine is worn out and its blades are deformed. The harsh noises in the pipelines may also be related to this
Could an expert please explain why a vortex pump’s turbine is used for the secondary impeller?
I would like to ask the original poster how self-priming is achieved during operation.
Expert! I also suspect it’s caused by cavitation
It is mainly based on the need to increase the pump’s head; at the rated flow rate, the designed pressure rise of the pump, that is, the maximum pressure difference between the inlet and outlet, is 2.0 Mpa
Personally, I don’t think there’s any major issue with the pump; it’s likely cavitation is occurring due to insufficient suction volume
Perhaps I didn’t explain it clearly enough: at the time of leaving the factory, the vertical distance between the installation level of the hydraulic pump and the level of the suction tank is approximately 9 meters； Suction is primarily achieved by the primary centrifugal impeller. In actual use, the pressure of LPG in underground tanks remains basically between 0.3 and 0.7 Mpa; feel free to share your experiences
When the pump outlet control valve is adjusted so that the outlet pressure exceeds 1.4 Mpa, a harsh noise begins to be heard in the pipeline; this is likely due to the increase in outlet pressure of the pump and the resulting increase in fluid flow velocity.
It seems that the secondary impeller is damaged