Any opinions on 18 or 20" manways for collection pots. Seems like it will drastically improve recovery times. Rated for 60psi, tested to 70. Should be good right?
More surface area would sure speed up recovery, but their pressure limits wouldn't meet ANSI/ASME 3X requirements.
The system must meet not only 3X the normal operating pressure, but 3X the pressure the system might logically see if for instance you ran out of refrigeration on a hot day.
n-Butane at 100F has a vapor pressure of 38 psi. 38 psi X3 = 114 psi.