Hi everyone,
I'm a graduate process engineer looking over the Design and Operations aspect for an LPG Plant.
I have a question in regards to PD Pump flowrate and the fluid it's pumping.
We would be blending Propane and Butane via a vane-type positive displacement pump.
However, the flowrate of propane and butane will vary (Liquid Propane at 72 m³/hr and Liquid Butane at 36m³/hr) due to "thermodynamic phenomena of each compound."
I understand that positive displacement pumps will always give a fixed flowrate and differential pressure (wrt pump RPM), so I'm in doubt on how the thermodynamics of the fluid affects the flowrate? Should it not give the same amount of volumetric flowrate regardless?