R134a consider as lethal?
R134a consider as lethal?
(OP)
Dear forum member,
I would like to ask is R134a consider as lethal substance? I read UW-2 stating that lethal substance is gas or liquids that in nature that very small amount of gas or vapor that inhaled by human can be dangerous to life. How to measure the "small amount" in the sentence? Is there a chemical list provided by asme stating that type of liquid or gas that are officially declared as lethal? Thanks in advance.
I would like to ask is R134a consider as lethal substance? I read UW-2 stating that lethal substance is gas or liquids that in nature that very small amount of gas or vapor that inhaled by human can be dangerous to life. How to measure the "small amount" in the sentence? Is there a chemical list provided by asme stating that type of liquid or gas that are officially declared as lethal? Thanks in advance.





RE: R134a consider as lethal?
A brief recap:
- No, ASME does not publish a list of substances that would be considered lethal.
- OSHA (applies to USA only) doesn't have a clear directive on the matter.
- Ask the customer if lethal service is required, they are responsible for that determination.
- If all else fails, use good engineering judgement.
My thinking is that R134a would not be considered lethal. The substance itself is not lethal, but it does have oxygen displacement potential, especially in large quantities. Canisters of it are sold at most auto parts stores in the US. The same cannot be said of anhydrous ammonia or hydrogen sulfide.
RE: R134a consider as lethal?
RE: R134a consider as lethal?
RE: R134a consider as lethal?
http://www.eng-tips.com/viewthread.cfm?qid=308653
RE: R134a consider as lethal?
RE: R134a consider as lethal?
LD 50 (oral) mg/kg body mass = LD 50 <=1
LD 50 (percutaneous) mg/kg body mass = LD 50 <=5
LC 50 (inhalation) ppm = lc 50 <=10
Note: LD 50/LC 50 is dose/concentration lethal to 50% of the animals tested.
Cheers,
gr2vessels
RE: R134a consider as lethal?
We can't do this here in the United States !
Can we all agree that phosgene gas is to be stored in vessels designed for lethal service.... ??
Can we also agree that air stored at 15 psig, at ambient temperatures is NOT lethal service ???
I suspect that the reason for this has to do with lawsuits suffered by ASME in years past.
I understand that, decades later, it still hurts when ASME sits down......