To solve this problem, let's understand the concept of non-condensable gases in a cylinder of HFC-134a and what pressure it should not exceed at a given temperature.
Non-condensable gases are gases that do not easily liquefy under the typical conditions of temperature and pressure where the cylinder is stored or used. When checking a cylinder for such gases at a particular temperature, we need to ensure that the pressure does not exceed a certain threshold to ensure safety and proper function.
In this problem, we are given a temperature of 70 degrees Fahrenheit and need to determine the maximum allowable pressure of the HFC-134a in the cylinder, considering the presence of non-condensable gases.
Given the options:
A. 50 psig
B. 76 psig
C. 90 psig
D. 134 psig
We need to select the correct maximum allowed pressure to ensure the cylinder is safe for use.
Based on the known behavior of HFC-134a and the acceptable limits for pressure at the given temperature, it is determined that the pressure should not exceed:
B. 76 psig
Therefore, at 70 degrees Fahrenheit, the pressure should not exceed 76 psig to ensure there are no significant non-condensable gases present in the cylinder of recycled HFC-134a.
