Often, the big flap valve in the tower will stick open for a couple seconds and up to several minutes before it closes, hence the reason for the overflow of water. I have seen, in hot weather, the fireman overflow the tank on purpose to cool the tender water down for the injectors. You can see he let go of the rope prior to it overflowing thoough. The oxygen scavenger helps slow the boilers metallic corrosion by removing the boiler water derived oxygen.
Edited 1 time(s). Last edit at 12/18/2017 02:40PM by GMillerDRG.