Triple-screw pump helix angle
Thread Content
Three-screw pumps are commonly used in gas stations. When selecting a model, sometimes, given the same power and flow/pressure requirements, two pumps are available: one is slightly smaller in size but has a larger screw angle, such as 54 degrees； There is also a larger one with a helix angle of 40. I’d like to ask how to make a choice. Is it related to the viscosity of the oil?
Yu is related to your medium
The selection of the screw inclination is related to your oil type, pump speed, and net positive suction head. When the pressure is not high, within 6 bar, the temperature difference is small, meaning the viscosity does not change much and cavitation is not severe, it is fine to choose 54. In situations such as high outlet pressure and large temperature differences, it is better to choose 40. For normal use, choosing a model with 54 should be fine; this way the pump can be smaller in size and the price will also be lower.