Saturated steam design temperature
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Everyone, for saturated steam at 1.0 Mpag, what should the design pressure and design temperature be?
This should be quite common, are you referring to the design pressure and temperature of the pipeline?
Yes, I set the design temperature at 250°C, but during the review it was said that this value was too high; 188°C would be sufficient
We should still consider whether the pipes might experience overheating or overpressure. Personally, I think 5°C is a bit low (which corresponds to a pressure of 1.1 MPa; a pressure fluctuation of just 1 kilogram would already lead to overheating), so we usually increase the temperature by 30°C.
This depends on the distance between your installation and the power plant or the steam generation source; a low superheat level makes it unsuitable for long-distance transmission. The temperature in our factory can reach around 280°C
The design pressure should be set at least at 1.1 MPa, and the design temperature can be around 200°C; the value you have chosen is indeed too high.
We usually use 200 degrees Celsius; the 188 degrees you have approved is slightly lower. You need to take into account the possibility of slight overpressure, but generally, the materials used for steam pipes can withstand this temperature level without any problem
It depends on how you control the pressure to deal with these pressure fluctuations.
The steam temperature at 1 Mpa must be at least 168°C
It is recommended to use a design pressure of 1.1 MPa, corresponding to a saturated water vapor temperature of 188°C.
There is no consensus on this issue; it seems to be a matter of dispute. I see that the design pressure for the equipment is set at 250°C – so doesn’t the pipeline also need to be able to handle 250°C?