① High Power Consumption: For a given mass flow rate, gas has a high volumetric flow rate due to its low density. Therefore, the flow velocity in gas conveying pipes is much greater than that of liquids. The former's economic velocity (15-25 m/s) is approximately 10 times that of the latter (1-3 m/s). Thus, transporting the same mass flow rate at their respective economic velocities, through the same pipe length, the resistance loss in gas is approximately 10 times that of liquids. Consequently, gas conveying equipment often consumes a lot of power.
② Gas conveying equipment is generally large, especially for equipment with high outlet pressures.
③ Due to the compressibility of gas, changes in pressure within the conveying equipment also cause changes in volume and temperature. These changes significantly affect the structure and shape of the gas conveying equipment. Therefore, gas conveying equipment needs to be categorized based on outlet pressure.