Issues regarding the design temperature for atmospheric pressure vessels per NB/T47003
Thread Content
The design temperature specified in NB/T47003 for atmospheric pressure vessels is the allowable temperature of the material. Does this allowable temperature refer to the highest temperature listed in the allowable stress table in this standard? In most cases, it does not exceed 350 degrees. For example, if Q345R is used now and the design temperature is 400 degrees, cannot it be used for design according to this standard? Can we only increase the design pressure and use GB/T150 for design?
The standard limits on design temperature are such that for vessels at atmospheric pressure, temperatures above 350 degrees are quite rare
According to the NB/T47003 standard, it can only be used at 350 degrees. I just think that the allowable stress of 400 degrees specified in GB/T150 can be used; the design pressure should remain at atmospheric pressure. It is sufficient to state in the design specifications that “NB/T47003 shall be referred to”, as the allowable stress applicable to pressure vessels is certainly suitable for equipment operating at atmospheric pressure as well.
I don’t think it means that just because the allowable stress values specified in NB/T47003 are limited, the material cannot be used at 350°C; rather, pressure vessels under normal conditions rarely reach such high temperatures, so it is completely acceptable to refer to the temperature range for using the material as specified in GB150.