I am currently working on a mixed refrigerant LNG cycle. There are total four components of the mixed refrigerant such as methane, ethane, propane, butane. When I have started doing the safety analysis (HIRA) of components such as compressor, heat exchangers, I find out that in the safety data sheets few of the data are not available for mixed refrigerants.
How I can do the inherent safety analysis of mixed refrigerant cycle, is there any mixing rule available or I should make some assumption, or I should give priority to any specific component of the mixed refrigerant and do the safety analysis.
It will be very kind of you if you can manage some time and give me your valuable feedback.
Best regards,
Rasel
For a quick first check I would recommend contacting your equipment manufacturer. For their own development and research I am sure that they have such analyses on the shelf. If you are a student, you may still be able to obtain that information from a supplier, or contact someone in the LNG industry. That is not any type of proprietary knowledge, and all Safety Professionals are happy to share anything that will promote safer operations and understanding.
From a chemical perspective you really can look at each component individually in terms of safety. The negative effects are usually additive. That is, the addition of nitrogen, argon, or helium doesn't do a lot to mitigate the potential effect from a release of the flammable components, and each of them will have the same thermal operating envelope in the mixture as they do individually. See also:
https://cryogenicsociety.org/resources/defining_cryogenics/mixed_refrigerant_cycles/
https://www.semanticscholar.org/paper/Optimization-of-Single-stage-Mixed-Refrigerant-LNG-Kim-Dan/
https://www.cheminst.ca/wp-content/uploads/2019/04/404-Safety-Aspects-of-Floating-CSChE2017.pdf
Article Inherent Safety Analysis of a Propane Precooled Gas-Phase Li...
Best regards,
Steven,
Steven Cooke thank you so much, Sir. I discussed it with one of my friend who had five years of industrial experience and safety training. He suggested me to consider the most hazardous component among the mixed refrigerant.
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