Stress Corrosion Cracking in NH3 Vessels

[US Iceman]

They sometimes decide to purge a little too much and fill the water container with NH3.

I suspect this problem is not due to the purger. It is probably due to liquid backing up in the condenser coil (above the purge point). When the purge solenoid opens, liquid is vented into the purger instead of gas.

This sounds a lot more like the condenser coil is stacking up liquid due to poor drainage or lack of sufficient equalization through the equalizing line.