Study on the Net Speed of Vacuum Pump in Long-distance Pipeline Vacuum Drying

The influence of pipeline flow resistance on net speed of vacuum pump is analyzed in long-distance pipeline vacuum drying,the calculation method of net speed of vacuum pump is given and checked up with site experiment. The experimental results show that the pressure at the outlet end of pipeline is lower than that of the other end. It is considered that the results are important base to further study and predicate the air exhausted time for vacuum drying of long-distance pipeline.