Negative pressure issue at the top of the hydrochloric acid storage tank
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As shown in Figure 4, there are four hydrochloric acid storage tanks with a diameter of 10,000 mm and a height of 12,000 mm; they contain no material (they are not in use). The balance pipes between the tanks are connected, and the vent valves on the top of the tanks are closed. The pressure transmitters installed on the tank tops have been calibrated and are functioning properly. So why is negative pressure indicated in all of them? Is a vacuum created inside? The manhole at the bottom of the pipe still shows negative pressure, which is utterly puzzling
Parameters have been reset; compensation may be required
Negative pressure may occur if condensation takes place