Reasons:
--- Before the steam is supplied to the steam pipeline, the pipe is not warmed enough and water-discharging is not enough, or there is still air left in the pipeline.
--- The check valve on the feedwater pump is opened suddenly or closed suddenly, so that the water pressure is not stabilized.
Treatment:
--- For the water-hammer on the steam pipeline, the drainage valve on the superheater system should be opened, water should be totally discharged and the remaining air in the pipeline should be exhausted in time. The water pressure in the feedwater pipeline should be stabilized and the air should be exhausted.