Problem of purging excess material in the unloading pipeline
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After the material is unloaded by the unloading pump, nitrogen purging lines are connected at the interface with the tank truck to carry any remaining material to the storage tank. So, for the pressure-reducing valve on the nitrogen pipeline, what pressure should it be set to? The height of the storage tank is 6 meters. The nitrogen pressure is too high; there’s a risk of things happening too quickly and it’s not safe. If the pressure is too low, there’s concern that it won’t be enough to blow things away ! I asked for advice!
If the nitrogen pipeline is a metal pipe, the pressure can be higher; if it is a temporary plastic pipe used for nitrogen purging, then the pressure resistance of that plastic pipe needs to be taken into account
This post was last edited by lightemplar123 on 2017-7-7 10:05; it depends on the size of the exhaust port in your tank
What is the purpose of purging residual material from the pipeline?
It depends on the density of your material; calculate the pressure generated by this height – materials for which this pressure is sufficient can be blown into the tank. But there is another issue: when the diameter of the delivery pipeline is too large, the gas breaks through the liquid level and reaches the tank directly, resulting in some gas not reaching the tank. This factor needs to be taken into account. Nitrogen pressure > Material pressure = Density × Liquid column height + Pressure inside the tank. Also, the settings related to venting your tank need to be ensured so as to prevent overpressure.
It’s quite difficult to determine the correct gas supply pressure – the length/size of the pipes, as well as the liquid level, all have an impact on the tank pressure. After all, it’s usually a one-inch gas pipe; it’s possible to find out how much the tank pressure rises after a few seconds of gas flow by conducting a test. Make sure to keep an eye on the tank pressure display to avoid exceeding the safe limit. Our supply pipes are 1 kilometer long, and when 6 kilograms of gas is injected into a 1,000 cubic meter tank, not much increase in pressure will occur.
Is this one with automatic purging, or is the purging controlled by a manual switch? If not controlled properly, could it cause the tank to overpressurize? !
What is the ultimate purpose? What is the goal of cleaning it thoroughly? Is maintenance needed? I don’t think it’s necessary at all to purge it completely. To prevent liquid expansion, it is sufficient to drain a little liquid.
What is the ultimate purpose? What is the goal of cleaning it thoroughly? Is maintenance needed? I don’t think it’s necessary at all to purge it completely. To prevent liquid expansion, it is sufficient to drain a little liquid.