Natural gas is often transported through a long pipeline from a gas field to a petrochemical plant. To increase the gas pressure, centrifugal fans must be installed along the pipeline. 
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The power of the centrifugal fan ranges from hundreds of watts to tens of thousands of kilowatts, the speed is 3000~10000r/min, and the pressure is generally 7355kPa or higher. Large-scale natural gas liquefaction plants typically choose axial fans from four aspects: flow, stand-alone power, efficiency, and cost. 
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Axial fans stand out with their large flow and notably high efficiency, making them a superior choice in the transportation of natural gas. 
One axial fan is required for the same production line, while multiple centrifugal fans are needed.