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Thread: R290 rerigerant
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06-10-2022, 12:06 PM #1
R290 rerigerant
Hello, I have a question about A3 refrigerants, R290 and R600A. I know that precautions must be taken when working with these two flamable and explosive gases, however I've also read that the low pressure on the suction side can cause air to get inside the circui if there's a leak, and this could cause an explosion if the correct ration between air and gas is achieved. Is that true? If so, how do we make sure this doesnt happen?
Thank you!
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06-10-2022, 02:55 PM #2
Re: R290 rerigerant
The mixture of released flammable refrigerant from the refrigeration system and air in atmosphere must be within a certain mixture range. No explosion can occur if R290 presents with less than 39 grams per cubic meter air or above 177 grams per cubic meter air.
The first action to take is to ensure that the installation is to industry/legal standards, strength and pressure testing shold ensure that you have a leak free system. A satisfactory vacuum test is also required.
The installation of a low pressure cut-out switch set to a positive pressure should prevent the system running at a negative pressure.Brian - Newton Abbot, Devon, UK
Retired March 2015
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06-10-2022, 04:27 PM #3
Re: R290 rerigerant
Sounds like a college question
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06-10-2022, 04:48 PM #4
Re: R290 rerigerant
The installation of a low pressure cut-out switch set to a positive pressure should prevent the system running at a negative pressure.
Thank you
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06-10-2022, 04:56 PM #5
Re: R290 rerigerant
Hi Frank, I'm not sure what you mean. If you think that I'm doing some kind of school project or homeworks, that's not the case. I'm just a hobbist trying to make a cold trap for a project of mine. I've tryed asking to some professionals in my area, to provide me with their service for a price but they never replyed. I guess that designing a refrigeration system is something too time consuming for the amount they're confortable charging me with. Anyways, I reiterate, I'm very well informed of the dangers working with A3 refrigerants so I want to understand what tools and what knowledge I need to have in order to work with all the safeties in place.