Design questions regarding the nitrogen system
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I have a question to ask an expert: I need to design a nitrogen system, and the basic details are as follows: the nitrogen source is a liquid nitrogen tank with a purity of 99.99% and a temperature of -130 degrees Celsius. There are 6 gas usage points in total, with each point consuming approximately 0.2 m3/h of gas. The gas pressure options are 0.7 bar, 6 bar, and 12 bar. There is an 8-cubic-meter nitrogen storage tank installed. Is it possible to design it in such a way that the liquid nitrogen tank is connected directly to the vaporizer; after the vaporizer, there is a nitrogen storage tank, and from there, pipes are used to deliver nitrogen to various user locations. Pressure regulation is carried out at those user locations before the nitrogen is supplied for use by them. Since our design institute has not carried out any designs involving nitrogen, we are not sure whether doing this is a problem. Additionally, are there any other things to keep in mind in this system design? Thank you first!
That’s possible, but if the 6 users are spread out and the pressures are 12, 6, 0.6, then at least 4 control valves are required. If the control valves are placed together, a maximum of 2 control valves are required. But the pipes might need to be increased.
Well, you’re referring to the number of pressure regulators on the user side. I think that if there are two user points with the same pressure and they are located close to each other, I can first set the pressure to the desired level and then distribute it to those two user points. I’m not worried about that aspect. What really concerns me is whether the design of the vaporizer and the storage tank is sound; I’m not sure if there are any omissions or errors.
A pressure relief valve needs to be installed at the outlet of the nitrogen storage tank, as the pressure is unstable during vaporization. Too many pressure relief valves may make on-site adjustment complicated, but installing one at the outlet of the nitrogen storage tank can solve this problem