I would like to ask: for a device whose working medium is methanol and whose operating temperature is 42°C, with all other parameters meeting the regulatory requirements, is it necessary to classify it?
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I would like to ask whether a device whose working medium is methanol, operating at a temperature of 42°C and a pressure of 4.6 MPa, with a volume of 1.33 m3, needs to be classified. According to the regulatory specifications, it cannot be classified as belonging to any specific category; it is therefore considered a device outside such categories. However, its working medium is methanol, which is a volatile and explosive substance, and leaks of this substance pose a serious risk. I believe that it should not be subject to any classification-based management, but I’m unsure about this. I hope experts can provide some guidance.
This post was last edited by Xixi on 2020-4-26 08:34. It is not classified, provided that the gas phase space also does not meet the regulatory requirements. However, not classifying them should not lead to a relaxation of management and control during manufacturing and use
Is there a gas phase space? The storage filling coefficient will not exceed 0.95; for now, we will use your maximum refilling coefficient. In that case, the volume of the gas phase is 1.33*0.05 = 0.067 m3. Therefore, it is necessary to classify it, and it should be classified as belonging to the first group of media
The filling factor is 1.0; it is a device designed as an updated version, but the design classifies it as a Class 2 device, and I am somewhat puzzled as to why.
However, the original design classified it as a Class II device, and I’m a bit puzzled as to why.
This post was last edited by gn_1984 on 2020-4-26 09:10. If it is a storage tank, if the volume of the gas phase exceeds the limits specified in the regulations regarding solid solubility, then it must be classified and subject to supervision; during use, it is possible that the gas phase volume may fall within the limits allowed by those regulations on solid solubility. It is best to implement classified regulation.
This is a heat exchange device, with methanol as the medium in the shell side. So it can be considered to be full. However, the original design classified the device as a Class II device, and I’m a bit puzzled as to why.
If regulation is based on classification, how can supervision and inspection be persuasive?
Determine whether it is a storage container; there is a concept of a gas phase space in storage containers
One moment the working medium of one device is methanol, and the next it becomes a heat exchanger with methanol as the medium in the shell side – this is to test everyone’s ability to distinguish between them
The standard boiling point of methanol is 64.7°C, which the working principle cannot achieve. However, classification is still required when the gas space reaches the applicable range of large capacity regulations.