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Hi!
There is another thread on this board dealing with whether or not to use normalized plate for ammonia service, and some questions were raised as to what constitutes "Lethal Service." I thought that issue was worth its own thread. My background is in mechanical engineering, not chemical or Industrial Hygeine, and at the plant where I work we have an I.H. specialist to help make the calls.
However, I'd suggest that a source for helping to make a determination for "Lethal Service" would be the National Institute for Occupational Safety and Health, NIOSH. Their web site at has a listing of chemicals under the "IDLHs--Chemical Listing and Documentation" button which defines concentrations of chemicals which are "Immediately Dangerous to Life or Health."
For the question in the normalized plate thread, I'd say that the ammonia service is lethal if a small leak can cause a concentration at or above the IDLH level (300 ppm) in the immediate vicinity.
jt
There is another thread on this board dealing with whether or not to use normalized plate for ammonia service, and some questions were raised as to what constitutes "Lethal Service." I thought that issue was worth its own thread. My background is in mechanical engineering, not chemical or Industrial Hygeine, and at the plant where I work we have an I.H. specialist to help make the calls.
However, I'd suggest that a source for helping to make a determination for "Lethal Service" would be the National Institute for Occupational Safety and Health, NIOSH. Their web site at has a listing of chemicals under the "IDLHs--Chemical Listing and Documentation" button which defines concentrations of chemicals which are "Immediately Dangerous to Life or Health."
For the question in the normalized plate thread, I'd say that the ammonia service is lethal if a small leak can cause a concentration at or above the IDLH level (300 ppm) in the immediate vicinity.
jt
