Installation of breather valves on storage tanks in chemical plants

This is a very professional question 👍 The vent valve (flame arrestor vent valve) in chemical storage tanks is essentially a safety device used to maintain pressure balance inside the tank and prevent overpressure or underpressure conditions. The main reason for not installing manual valves is to prevent accidental closure – if they are forgotten to be opened during maintenance or closed by mistake in normal operation, the storage tank can become a sealed container, which makes it very likely for explosions or deflation accidents to occur when materials are added to or removed from it. In fact, some designs also include manual valves before and after the breathing valve, but they must meet the requirements of being normally open + sealed with a lead seal, or having a dual-valve interlock mechanism, and they must be strictly managed through operation tickets. However, the standard practice still recommends not using manual valves, as this provides higher safety redundancy and reduces the number of potential failure points. If installation on-site is indeed necessary, it is recommended to refer to the \"Safety Valve Installation Specifications\" and the tank design documents, and consult a professional design firm for confirmation; do not make changes based solely on experience.

Hello, I’ve learned a lot. I asked the design institute about specific standards for handshake, but they didn’t provide any specific regulations; they only said it was **required**