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.
Example-Higher Temperature and Reduced Strength. If operating pressure for a 6 Schedule 80 CPVC pipe is 167 psi, the maximum operating pressure at 150 oF (66 oC) is reduced to.(167 psi) 0.5. = 83.5 psi. Temperature Derating of Steel Pipes-Temperature derating factor of steel pipes. 2  Plastic Pipes and Operating Temperatures-ABS, PE, PVC, CPVC, PB, PP and SR-Operating temperatures with or without pressure. 3  PVC Pipes-Pressure Ratings-Maximum operating and required burst pressure of PVC-Polyvinyl Chloride-pipe fittings.