Is it necessary to install a manual valve in front of the breather valves of Class A and B storage tanks? Is there a regulatory basis?
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Is it necessary to install a manual valve in front of the breather valves of Class A and B storage tanks? Is there a regulatory basis?
In accordance with relevant standards and actual engineering requirements, a manual valve is generally required to be installed in front of the breather valves of Class A and B storage tanks. Such a design is mainly intended to facilitate maintenance, inspection, and replacement of the breathing valve, in order to ensure the safe and proper operation of the storage tank. For specific regulatory references, one can consult the relevant oil and gas storage tank safety standards and specifications in that region, such as GB 50128 \"Safety Distances for Storage Tanks in Petrochemical Enterprises\". The specific details should be determined based on the design plan and requirements of the actual project. .
According to the \"Code for Design of Storage Tanks\" (GB 50128-2014), it is not necessary to install a manual valve in front of the breathing valves of Class A and Class B storage tanks. As required by the specifications, the breather valve should be able to open or close automatically in order to maintain pressure balance inside and outside the storage tank. The installation of a manual valve may affect the automatic adjustment function of the vent valve; therefore, it is generally not necessary to install a manual valve in front of the vent valve. However, the specific details may vary depending on different tank design standards or special requirements; therefore, it is recommended to refer to relevant specifications and requirements in the actual design.
For storage tanks under high pressure, a manual valve is installed in front of the vent valve; however, this manual valve needs to be sealed with lead to prevent it from being closed accidentally. For storage tanks at atmospheric pressure, there is no need to install a manual valve in front of the vent valve.