Tank venting
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For nitrogen-sealed and insulated storage tanks, how is the size of the relief valve determined, and how is it calculated? Is there anyone who knows about this?
1. First, determine the wetted area of the equipment. 2. Refer to section 5.15.2 of API-521; there are some formulas that can be used. 3. Calculate the pressure release rate. 4. Calculate the orifice area. 5. Consult a table to find the corresponding size of safety valve
Check the gas seal design of HG20570 for it
Is your storage tank a floating roof tank or a fixed roof tank? For the pressure relief equipment of storage tanks, it is recommended to refer to the relevant requirements in SHT3007-2014 \"Design Code for Tank Areas in Petrochemical Storage and Transportation Systems\". For atmospheric and low-pressure storage tanks, the accident pressure relief equipment should be an emergency vent manhole cover or a breathing manhole with a diameter of not less than DN500. The opening pressure of the pressure relief device should be higher than the exhaust pressure of the breathing valve, and should be less than or equal to the design pressure of the storage tank ； The ventilation capacity of the pressure relief equipment should meet the ventilation requirements necessary to ensure the safety of the storage tank in case of failures in the nitrogen seal or breather valve ； For the specific gas volume, refer to clause 5.1.6 of this specification or the relevant requirements in HGT 20570.16 \"Installation of Gas Seals\"