March 30 2021
Folks,
Sacrificial Anode
Inspection and Replacement
Preventive Maintenance
At the Water Treatment Plant today
This here is a Chlorine Evaporator
Liquid elemental chlorine goes in, gaseous elemental chlorine comes out
The liquid chlorine enters a chamber in the centre of the vessel
Around the outside of this chamber is a water jacket
A heating element keeps the water in that jacket at a temperature around 38℃
The heat from the mass of water conducts through the internal wall of the water jacket and evaporates the liquid chlorine in the centre into it's gaseous form; hence the name
The chlorine gas then flows on through a pipe to the rest of the dosing system
Chlorine is dosed at a low rate into drinking water to disinfect it so it's safe for people to drink and wash with
Today's job was to replace the six sacrificial anodes inside the water jacket on two of the plant's four chlorine evaporators
That's twelve in total
What's a sacrificial anode?
Also known as a galvanic anode; it's a piece of metal that is in effect, subjected to corrosion through electrochemical design so that more important metal parts do not corrode
More on the theory of cathodic protection if you're interested
The more important metals, in this case, are the walls of the inner chlorine chamber and the water jacket
Every 12 months, the anodes in the plant's chlorine evaporators are replaced with new ones
The first step was to find the circuit breakers for the evaporators
Switch them off
Then lock out the switches so the evaporators are de-energised and safe to work on
Here's a box of the shiny new replacement anodes on top of a chlorine drum
And here's a couple of the anodes that were removed from the evaporator
These anodes are made of Magnesium
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