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.
At temperatures above 20Â°C the maximum allowable operating pressure must be reduced in proportion to the material strength. Use of PVC pipes in the temperature range from 20Â°C up to the recommended maximum continuous operating temperature of 60Â°C is well defined (for more information see PVC Temperature Considerations).owever, it is not customary to utilise this increase in strength by increasing the pressure rating. The nominal pressure rating of the pipe at 20Â°C, or PN, should still define the maximum allowable operating pressure at lower temperatures.