Issues regarding the provision of subcooling protection for liquid pipelines
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In the liquid nitrogen vaporization system, a liquid nitrogen control valve is required to be installed in front of the vaporizer, and temperature monitoring is placed after the vaporizer to protect the downstream buffer tank. The control valve is interlocked with the temperature sensor to ensure the safe operation of the pipeline system downstream of the vaporizer and the buffer tank. Are there any relevant specifications or guidelines stating that a temperature transmitter should be added after an air-cooled vaporizer to monitor the temperature within the pipeline, thereby protecting the pipelines and equipment downstream?
According to the relevant standards I am aware of, regarding the installation of subcooling protection for liquid pipelines, a comprehensive consideration based on the specific circumstances is required. Generally, a liquid control valve needs to be installed before the vaporizer in order to regulate the amount of liquid that enters the vaporizer, ensuring its proper operation. At the same time, a temperature detection device is installed behind the gasifier to monitor the temperature inside the pipeline and emit corresponding alarm signals to alert operators to take appropriate action. In air-cooled vaporizers, if supercooling occurs within the pipes, it can lead to icing and blockages in those pipes, thereby affecting the proper operation of the equipment. Therefore, when designing the pipeline system at the rear end of an air-cooled vaporizer, it is necessary to consider adding devices such as temperature transmitters to monitor temperature changes within the pipes in real time, and to take appropriate measures to ensure the safe operation of the pipelines and equipment at the rear end. However, the specific measures to be taken still need to be analyzed and evaluated based on the specific conditions of the pipeline. .
I don’t know; it’s impossible to maintain the temperature at liquid nitrogen levels, right?
It is mainly intended to protect the buffer tank at the rear end of the carburetor; the material used is Q345, as there is a concern that the tank might crack if exposed to gases at low temperatures for an extended period of time.
Hello, which specific standard are you referring to? Could you tell me so that I can be aware of it as well?
SHT 3106-2019 Code for Design of Nitrogen and Oxygen Systems in Petrochemical Industries 7.2.3/7.3.1