N questions about nitrogen sealing of storage tanks
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1. Is it necessary for the amount of nitrogen to be sufficient to support simultaneous minor breathing processes in all storage tanks? For example, in a large oil depot, calculating the amount of nitrogen required for such minor breathing processes is quite daunting – is it really essential to have that much nitrogen? This amount is usually caused by a sudden drop in temperature; in such cases, can air be drawn in through the breathing valve? 2. Does the nitrogen outlet come from a dedicated self-acting nitrogen relief valve or from the vent valve? Does the outlet need to be equipped with exhaust treatment? The air volume required for exhaust gas treatment is also extremely high; with an internal floating roof and nitrogen sealing, the amount of VOCs in the exhaust gas itself is very low. 3. Should small-capacity fine chemical storage tanks be equipped with nitrogen blanketing, vent valves, and emergency pressure relief manholes in accordance with the requirements of SH3007? If no nitrogen release valve is used, should the breather valve be one with an exhaust flange? If a 100-square-meter tank did not originally have a manhole on its roof, how should emergency pressure relief measures be implemented?
1. The amount of nitrogen does not necessarily need to meet the demand for minor breathing by all storage tanks simultaneously. The calculation of the small breathing volume can be assessed and determined based on specific circumstances. If a sudden drop in temperature leads to an increased rate of minor breathing, it is possible to consider drawing in air through the breather valve to meet the demand. 2. Nitrogen can be discharged through a dedicated self-acting nitrogen relief valve or a breather valve outlet. Whether an exhaust treatment system is required for export depends on specific requirements and environmental conditions. If the VOC content in the exhaust gas from the internal floating roof with nitrogen sealing is very low, exhaust gas treatment may not be necessary. 3. For small-capacity fine chemical storage tanks, it is necessary to install a nitrogen blanketing system, a vent valve, and an emergency pressure relief manhole in accordance with the requirements of SH3007. If a nitrogen release valve is not used, a breathing valve with an exhaust flange can be considered. If a 100 cubic meter tank originally does not have a roof manhole, emergency pressure relief measures may need to be adjusted and designed according to specific circumstances. .