Design temperature and purge temperature issues
Thread Content
If the design pressure of a tower is 1.0MPa and the design temperature is 80 degrees, is it feasible to use 1.0MPa steam as the purge medium for the tower? During steam purging, the steam temperature should be above 200 degrees. If the steam pressure is controlled to be lower, it should be at least 160-180 degrees. In this way, the temperature during steam purging exceeds the design temperature.
Steam purging can be used, but strength calculations must be made. One thing is for sure, only steam below 1.0MPa can be used.
Since the design temperature is lower than the purge temperature, please do not use super-temperature steam. For example, gaskets, equipment expansion, etc. are not designed for such a temperature. Since the design temperature is 80 degrees, the temperature needs to be raised to 200 degrees. If the pressure remains unchanged, it is unlikely. Do not use it.
Your design temperature is only 80 degrees, but if you use steam far exceeding this temperature, your pipeline will almost be scrapped, and the most terrible thing may be an accident.
Use nitrogen blowing instead, or wash with solution
I guess not. The design temperature of the tower is 80 degrees. Generally, the tower internals, tray plates, connecting bolts, flanges, etc. are designed according to normal temperature. Steam entering at 160-180 degrees may deform the tower internals and cause stress concentration. The purge pressure and temperature cannot exceed the design pressure and design temperature.