Analysis and measures of moisture and pipeline condensation in underground plants of Shandong Taian pumped storage hydropower station

Since the operation of ventilation and air conditioning system of underground plants in 2007,the moisture condensation phenomenon occurs seriously on the pipeline. Performs the long-term and continuous test for operation condition of hydropower station. The result shows that condensation occurs commonly when surface temperature of water tube is lower than dew-point temperature of the ambient air from April to June, while this phenomenon vanishes basically from July to August since the surface temperature of water tube is higher than dew-point temperature of ambient air. Presents the following detailed anti-condensation measures, including performing the insulation on part of tubes with nonflammable material, selecting appropriate ventilation rate according to seasons, designing reasonable air distribution, and operating different numbers of refrigeration dehumidification machines.