Determination of the design temperature for pressure vessels affected by low-temperature environments
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I read in a book the principles for determining the design temperature of pressure vessels affected by the environment: 1. For storage vessels containing compressed gases without any insulation, the design temperature is the lowest ambient temperature (the average monthly minimum temperature) minus 3 degrees Celsius. 2. For storage containers filled with liquids whose volume accounts for more than 1/4 of the container’s capacity and that lack insulation, the design temperature shall be set at the lowest ambient temperature. These two principles have no basis in standards; let’s discuss whether design can be carried out according to them.
I’ve encountered a similar problem as well. I’d like to ask the original poster: which book are you referring to? Last time I designed a vent pipe for the Inner Mongolia region; according to the process requirements, normal temperature should be sufficient, but I’m not sure whether to take the ambient temperature into consideration. I hope experts can give me some advice
This post was last edited by Pinocchio on 2011-9-13 at 19:55. Refer to new regulation 3.10(2): When designing pressure vessels for storage at normal temperatures, full consideration must be given to the impact of the ambient temperature under normal operating conditions on the temperature of the vessel’s metal shell. The lowest allowable design metal temperature shall not be higher than the lowest value of the monthly average minimum temperatures over the years (i.e., the sum of the lowest temperatures recorded on each day of the month divided by the number of days in that month). The average monthly minimum temperatures over the years can be obtained from the local meteorological agency. The vent pipe is likely not a storage container, but if the ambient temperature affects the operating temperature, it still needs to be taken into consideration.
Reply to 2# fengshuangyexue: Compiled by Dai Jihuang, Chen Zepu, etc., published by Chemical Industry Press. Vent pipes are not considered storage containers; if the pressure is very low, there is no need to worry about them.
Article 4 of HG20580-20115.0.2