Question for assistance: When a nitrogen seal is installed in a storage tank, should the diameter be increased downstream of the nitrogen seal valve?
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This post was last edited by run-up on 2020-7-10 at 14:58. When installing a nitrogen seal and a vent valve in a storage tank, there is a large pressure difference across the self-acting control valve of the nitrogen seal; should the diameter be increased on the side downstream of the valve? For example, if the nitrogen seal flow rate is 1916 cubic meters per hour, and the nitrogen seal valve has a diameter of DN80, then if the diameter after the valve remains DN80 as well, the flow velocity will reach 105 m/s, which is too high. I hope the experts can help answer my questions. Thank you.
Diameter expansion is required downstream of the valve; the pipe diameter must be calculated both upstream and downstream of the valve to keep the flow rate within a reasonable range.
It would be best to provide a schematic diagram to facilitate discussion. Typically, such processes equipped with self-acting control valves consist of a valve assembly. As for diameter expansion, it should be necessary. But it also depends on the actual amount of nitrogen sealant used. I wonder what kind of equipment requires such a high sealing flow rate.
What is the capacity of the container? What is the pressure range? What is the pump’s flow rate in M3?
Sure, treat it as a regular control valve; diameter adjustment is also a standard procedure