Why is it necessary to warm the pipes before starting a turbine?
Thread Content
Why is it necessary to warm the pipes before starting a turbine?
⑴Before startup, since the main steam pipes, various valves, flanges, etc. are at a cold state, a small amount of steam is introduced into the inlet pipelines to allow the pipes to heat up gradually and expand evenly, thereby reducing thermal stress. ⑵During pipe warming, it is necessary to properly control the rate of temperature increase in the main steam pipes and their accessories; the pressure increase rate during this process should not be too fast, as otherwise the flange connection bolts, pipes, and valves may experience excessive thermal stress due to the rapid temperature rise, leading to cracks or damage.
Before use, the turbine is in a cold state; once a large amount of medium-pressure steam enters it, thermal expansion occurs, which is why it needs to be preheated for a while before starting up!
Preheating the pipeline also prevents water hammer