Flame-retardant vent cap, Flame-retardant breathing valve, Vacuum pressure valve
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What is the difference between a flame arrestor vent cap, a flame arrestor breathing valve, and a vacuum pressure valve? Where is it applicable? As shown in the figure, a flame arrestor and a flame arrestive vent valve are connected in parallel on the vent pipe of an oil tank. Is this arrangement reasonable? What is the purpose of the “contact test port” as well?
With so many people viewing it, isn’t there anyone who will reply?\ud83d\ude0a I’ll give a brief explanation; if there’s anything wrong, please feel free to correct me. The image should show the vapor recovery and venting pipelines at a gas station. But typically, gas stations connect all the gasoline tank vent pipes in parallel, and then vent through two pipes. One is a flame-arresting vent cap (with the ball valve below usually closed), and the other is a breather valve (with the ball valve below usually open). Just half of the image is enough. The test tee section is used for oil and gas recovery testing.