Pressure piping system

The utility model discloses a pressure pipeline system which comprises a pressure pipeline and a drainage device, the drainage device comprises a first drainage valve set, a water storage tank, a second drainage valve set and a drainage pipeline, the water storage tank is communicated with the pressure pipeline through the first drainage valve set, and the water storage tank is communicated with the drainage pipeline through the second drainage valve set. Pressure pipeline higher than drainage pipeline. When the first drain valve set is opened, the second drain valve set is in a closed state,water vapor in the pressure pipeline enters the water storage tank, the flow speed of high-temperature and high-pressure water vapor is reduced due to the action of the water storage tank, and the scouring strength of the high-temperature and high-pressure water vapor to the first drain valve set is reduced. And then, the first drain valve group is closed, the second drain valve group is opened, the water vapor passes thr