Thermal expansion valves are installed on the inlet and outlet pipelines of the methanol storage tank
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I saw some design drawings showing thermal expansion valves installed on the inlet and outlet pipelines of the methanol storage tank; this is explained as a measure to address the risk of overpressure caused by thermal expansion when the valves are closed. Even at extreme summer temperatures, when 60°C is considered, the saturated vapor pressure of methanol is only 85 KPaA; at 80°C, it is 181 KPaA. The pressure remains within the range specified for pipeline design. I don’t understand why this thermal expansion valve is needed. Please ask Haiyou to provide a clear explanation and assistance
There are requirements regarding this in GB50016.
Similar processes in tank areas include methanol, ethanol, and dimethyl carbonate; all of them are classified as Class A substances. It’s important to understand the principles behind the installation of these thermal expansion valves
The regulations specify it; what’s there to worry about? Just follow them
Standardize the most. . One thing is that he only tells you that you must carry it out, without explaining why such a rule exists
How should Article 5.5.6 of the Petrochemical Regulations be understood? Do all pipelines carrying Class A B and Class B A liquids require such pressure relief safety measures?
How should Article 5.5.6 of the Petrochemical Regulations be understood? Do all pipelines carrying Class A B and Class B A liquids require such pressure relief safety measures?
It seems to be a throttle mechanism, designed to prevent excessive pressure fluctuations in the storage tank caused by too fast feeding or discharging.
The pressure relief resulting from thermal expansion mentioned here refers to the increase in pressure within a confined space when a liquid expands due to heat absorption; once the pressure reaches a certain level, it is necessary to release this pressure in order to protect the pipeline and related equipment. The thermal expansion of a liquid is related to its volume expansion coefficient, and it has nothing to do with the saturated vapor pressure.