Regarding the issue of installing check valves on the nitrogen sealing pipeline of methanol storage tanks
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The methanol storage area contains a total of 6 methanol tanks of various sizes, all of which are designed with internal floating roofs. Experts have required that check valves be installed on the nitrogen pipelines of all these tanks. Which standard mandates this requirement? Is it permissible to install a check valve on the main nitrogen pipeline in the storage area? I would appreciate guidance from those with more experience in this forum.
Experts recommend installing check valves on the nitrogen sealing pipeline of methanol storage tanks, likely for safety reasons, to prevent methanol vapor from flowing back into the nitrogen supply or other equipment, thereby avoiding fire and explosion hazards. This requirement is usually based on **industry standards, such as GB50156-2012 \"Code for Design and Construction of Light Oil Depots for Liquid Fuels\" or NFPA 30 \"Code for Flammable and Combustible Liquids\". Simply installing a check valve on the nitrogen main pipe in the methanol tank area may not necessarily comply with the regulations. Since the function of a check valve is to prevent gas from flowing back into a specific area, installing it only on the main pipe does not provide protection for each individual tank. The best practice is to install a check valve on each tank’s nitrogen blanketing line, to ensure that all methanol tanks are properly protected. Ultimately, relevant safety regulations and standards should be followed; consult professionals or relevant departments if necessary. .
For safety, a check valve should be installed on each branch