15
Pressurization and Startup
Figure 7. Pressurized Gas Schematic
c. Pressurize the system to eight (8) psig, then close the shutoff valve.
Give the system one half hour to stabilize, then record the pressure
and the temperature.
d. Wait twenty-four hours, then read the pressure and the temperature
again and use the formula in the sidebar to obtain a corrected pres-
sure for comparison.
e. If the system loses pressure at an unacceptably high rate, re-pres-
surize it, leaving the gas supply on. A rule of thumb is that the final
pressure should not be less than half the initial pressure after
twenty-four hours.
Pressure Correction:
where PC = corrected
final pressure, psig
P
R
= final pressure as
read, psig
T
1
= beginning temper-
ature, degrees F.
T
2
= final temperature,
degrees F.
