Possibility #2 Not all asthmatics wheeze throughout an attack. Some don't wheeze at all. Sometimes lack of wheezing means they are no longer compensating so the lungs are hyper-inflated to the max and wheezing can't happen. Neither lung sounds nor O2 sats are good indicators for asthmatics. Peak- Flow meters are the best way to determine the status.
1 Answer. 0. The upper limit temperature for pressure service is 140 degrees Fahrenheit. ln structural pipe, gravity flow application in stable oils; the upper thermal limit is considered to be in the range of 160F for long term exposure; and up to 180 degrees Fahrenheit for short-term intermittent exposure.
In PVC tests, a maximum hydrogen chloride concentration of about 2100ppm was reached after burning of 10 grams of PVC for about 50 minutes, in the range of 500 to 570 degrees Fahrenheit. The permissible exposure limit for hydrogen chloride was 5ppm, and the permissible IDLH level was 100ppm.