Blind flange on the siphon reboiler pipeline

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This post was last edited by Clouds of flowing water shine on 2018-1-6 09:02. What is the purpose of installing 8-shaped blind flanges at the inlet and outlet points on the circulation pipes of vertical thermal siphon reboilers? Which of the following does it belong to? HG/T 20570.23—95 \"Installation of Blind Flanges\": 2.0.1 Locations where blind flanges need to be installed 2.0.1.1 During the initial startup preparation phase, when conducting strength tests or leak tests on pipelines, and it is not possible to carry out these tests simultaneously with those on the connected equipment (such as turbines, compressors, gasifiers, reactors, etc.), blind flanges must be installed at the connections between the equipment and the pipelines. 2.0.1.2 For various process material pipelines that connect outside the boundary area to inside it, when the plant is shut down, if such pipelines are still in operation, a blind flange shall be installed at the isolation valve. 2.0.1.3 When the device consists of multiple series, the main pipeline coming from outside the boundary area is divided into several branch pipelines that lead to each series, and blind plates are installed at the isolation valves of each branch pipeline. 2.0.1.4 When the device requires regular maintenance, inspection, or mutual switching, and the associated equipment needs to be completely isolated, a blind flange should be installed at the shut-off valve. 2.0.1.5 When pressurization pipelines and purge pipelines (such as nitrogen pipelines and compressed air pipelines) of Process I are connected to equipment, a blind flange shall be installed at the isolation valve. 2.0.1.6 Drain the low points of equipment and pipelines; if the process medium needs to be collected in a unified system, install blind plates after the shut-off valves. 2.0.1.7 Blind plates or plug valves should be installed behind the valves on the exhaust pipes, drainage pipes, and sampling pipes of equipment and pipelines. Except for materials that are non-toxic, do not pose a health risk, and are not explosive. 2.0.1.8 When the installation is constructed in phases, blind plates are installed at the isolation valves for interconnected pipelines to facilitate subsequent construction work. 2.0.1.9 For some auxiliary pipelines that need to be completely shut off during normal operation of the equipment, blind flanges should generally also be installed. 2.0.1.10 Situations where blind plates are required due to other process requirements.