Is the chlorine buffer tank a pressure vessel?
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Hello, expert. I am currently preparing the documents required for applying for a hazardous substance use license, and the issue relates to pressure vessels. In my system, the pressure inside the chlorine buffer tank is normally below 0.02 MPa; pressure only increases when the pipeline carrying liquid chlorine and liquid alkali gets blocked (the pressure level set by my safety valve is 0.3 MPa). So, does this chlorine buffer tank constitute a pressure vessel?
Based on what you’ve said, this device should not be considered a pressure vessel......
The operating pressure for your tank is 0.02. Normally, it should be considered a container that falls outside the scope of the regulations regarding fixed-volume containers. However, you mentioned that there could be an increase in pressure; I’m not quite sure about this. Is such an increase in pressure normal, and to what extent? If you say that pressure increase can only occur when the pipeline carrying liquid chlorine is blocked by liquid alkali (given that my safety valve is designed for a pressure of 0.3 MPa), then I can only say that if the operating pressure is set at 0.02 during design, it definitely qualifies as a container outside the scope of those regulations, since containers covered by those regulations must have an operating pressure greater than 0.1 MPa
Since a pressure increase to 0.1 Mpa hardly occurs, there’s no need to go to the special operations department for an inspection, right?
Check the frequency of this occurrence in the manufacturing process; otherwise, this increased pressure must be taken into account during design
This post was last edited by arpcd on 2015-6-17 at 14:51. As a highly hazardous substance, chlorine can easily be classified as a Class 3 pressure vessel even at low pressures (what is the product of pressure and volume? ). Low-pressure vessels (only for media with extremely high or high toxicity levels, and a product of at least 0.2 MPa·m3) are classified as category III pressure vessels. . The chlorine buffer tanks I have come across are basically pressure vessels, with types 1, 2, and 3 all present, and their safety valves are not allowed to discharge directly into the atmosphere. Chlorine buffer tanks are not classified as pressure vessels – are their tanks really that large? As for the operating conditions mentioned by the original poster, the authorities don’t care about that during the review; what matters is any potential increase in pressure that could occur during actual operation and use, and such scenarios must be taken into account in the classification and design.
In my understanding, it depends on whether the working pressure is greater than or equal to 0.1 MPa. If it is, and the product of pressure and volume is greater than or equal to 2.5 MPa·L, then it falls under the scope of pressure vessel regulations; otherwise, it is not a pressure vessel but merely a vessel at normal pressure. It is not regulated, nor are permits for pressure vessel design or manufacturing required
It’s either on the device’s name tag or it’s not
At a working pressure of 0.02 MPa, it cannot be classified according to capacity standards; the safety valve will only activate at 0.3 MPa, that is, only when overpressure occurs
A chlorine buffer tank is definitely a pressure vessel; I have worked on many of these
Why pressure vessels? Please explain what you consider to be the criteria for a pressure vessel, so that everyone can learn from it. Thank you!